Beetles Identification Guide

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10 IDENTIFICATION This section includes keys and illustrations for the identification of beetles commonly associated with stored products in Canada. The keys are artificial and are based largely on simple characters, such as coloration, shape of pronotum and antenna, density of punctation, and size. If more than one character is used in a couplet, the easiest observable or the least variable is listed first. Most of these characters are illustrated by line drawings. Because many species discussed here are small (less than 3 mm), proper identification usually requires the use of a binocular microscope, with a magnification of at least 40X, and a good light source. Most stored-product pests are not related, and thus the adults of many species can be easily identified by comparing them with the habitus drawings. Following the keys, a number of illustrations (Figs. 169—175) are provided for most species discussed in this book. The species are grouped according to their general habitus. If two or more species have the same general habitus (usually belonging to the same genus), the reader is referred to the appropriate key and couplet for specific identification. It is important to keep in mind that the following keys are written for species found in a particular habitat. Occasionally, strays could be encountered in storage places. In such cases, the reader should consult more comprehensive books, such as Borror et al. (1981) or Arnett (1973), for an identification at the family level and at generic levels.
IDENTIFICATION KEYS Key A GENERAL 1(0) Head prolonged into snout (Fig. 1) ............... (CURCULIONIDAE) 2 Head not prolonged into snout (Figs. 3 and 4) ......................................3 2(1) Elytra with intervals as wide as or wider than striae; strial punctures small, round to slightly elongate, distinctly separated (Fig. 32). Pronotum with punctures distinctly elongate, about twice as long as wide (Fig. 32). Wings greatly reduced. [Length of body 2.5—4.5 mm; habitus Fig. 193] ....... ........................................................................ Sitophilus granarius (p.98) Elytra with intervals much narrower than striae; strial punctures large, quadrangular, nearly contiguous (Fig. 33). Pronotum with punctures more or less circular or slightly elongate, less than twice as long as wide (Fig. 33). Wings fully developed. [Length of body 3.0—4.6 mm] ........ ............................................................................ Sitophilus oryzae (p. 98) 3(1) Head with median ocellus dorsally (Fig. 6) .............................................. .............................................................. (DERMESTIDAE, part) Key D Head without median ocellus dorsally (Figs. 7 and 8) ........................... 4 4(3) First visible abdominal sternum divided by hind coxae, thus posterior margin obsolescent at middle (Fig. 41) ........................... CARABIDAE First visible abdominal sternum not divided by hind coxae, thus posterior margin entire (difficult to observe in some species with dense pubescence) (Fig. 42) ..................................................................................................5 5(4) Body ant-like; head with short neck (see Fig. 178) ................................. .......................................................................... (ANTHICIDAE) Key B Body not ant-like; head without neck ................................................... 6 6(5) Elytra metallic blue or green ......................................... (CLERIDAE) 7 Elytra not metallic .................................................................................. 8 7(6) Legs pale, yellowish to reddish. [Length of body 3.5—6.0 mm; habitus Fig. 185] ............................................................... Necrobia rufipes (p.77) Legs dark, piceous to black. [Length of body 3.0—5.0 mm] ................. ........................................................................... Necrobia violacea (p.79) 8(6) Elytra short, exposing at least one abdominal tergum (Figs. 34—36) ..9 Elytra proportionally longer, covering abdomen or exposing only part of the last visible abdominal tergum (Figs. 32 and 33) ............................17 11
Page 1 and 2: BEETLES associated with stored prod
Page 3 and 4: © Minister of Supply and Services
Page 5 and 6: ACKNOWLEDGMENTS I am indebted to L.
Page 7 and 8: INTRODUCTION This book is intended
Page 9: Trogoderma inclusum LeConte Trogode
Page 13 and 14: Hind femur without or with small to
Page 15 and 16: 33(31) Pronotum with 6 large teeth
Page 17 and 18: Key B ANTHICIDAE 1(0) Integument of
Page 19 and 20: Key C CRYPTOPHAGIDAE 1(0) Antennae
Page 21 and 22: 16(15) Pronotum with anterior angle
Page 23 and 24: Elytra covered mostly with white or
Page 25 and 26: Key E LATHRIDIIDAE 1(0) Elytra with
Page 27 and 28: Key F NITIDULIDAE 1(0) Abdomen with
Page 29 and 30: Elytra moderately hairy, strial pun
Page 31 and 32: 9(8) Eye about 3 facets wide latera
Page 33 and 34: Figs. 9—21 Antenna (dorsal view).
Page 35 and 36: Figs. 32—38 Pronotum and elytra o
Page 37 and 38: Figs. 48—56 Elytra of (48) Anthic
Page 39 and 40: Figs. 66—74 Head and pronotum. (6
Page 41 and 42: Figs. 89—98 Anterior half of body
Page 43 and 44: Figs. 109—117 Head and pronotum o
Page 45 and 46: Figs. 124—132 Elytra and exposed
Page 47 and 48: Figs. 146—155 Head (lateral view)
Page 49 and 50: IDENTIFICATION PLATES 49
Page 51 and 52: Fig. 170 Stored-product beetles wit
Page 53 and 54: Fig. 172 Stored-product beetles wit
Page 55 and 56: Fig. 174 Stored-product beetles of
Page 57 and 58: GENERAL INFORMATION This section co
Page 59 and 60: Fig. 176 Lasioderma serricorne (Fab
Page 61 and 62:
Fig. 177 Stegobium paniceum (Linnae
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Sexual dimorphism: Males have 2 exp
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combination of having the surface o
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Fig. 179 Araecerus fasciculatus (De
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Fig. 180 Dinoderus minutus (Fabrici
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Sexual dimorphism: Males usually ha
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Fig. 182 Acanthoscelides obtectus (
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tibia; females lack such projection
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on the anterolateral margin of the
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Distribution: Cosmopolitan but more
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Fig. 186 Atomoria ephippiata Zimmer
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those of C. distinguendus Sturm, a
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Economic importance: As mentioned f
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Economic importance: As mentioned f
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Woodroffe, G.E.; Coombs, C.W. 1961.
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the Coleoptera dealt with here by t
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Fig. 190 Cryptolestes turcicus (Gro
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Fig. 192 Oryzaephilus mercator (Fau
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David, M.H.; Mills, R.B. 1975. Deve
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Fig. 193 Sitophilus granarius (Linn
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Most species feed almost exclusivel
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Fig. 194 Anthrenus scrophulariae (L
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Fig. 195 Attagenus unicolor (Brahm)
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successful in rearing the species o
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have recently become serious pests
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probably surviving on the remains o
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Fig. 199 Reesa vespulae (Milliron).
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Fig. 200 Thylodrias contractus Mots
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Fig. 202 Trogoderma glabrum (Herbst
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with insecticides, and in a short t
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Economic importance: The species is
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Fig. 203 Mycetaea subterranea (Fabr
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Fig. 204 Carcinops pumilio (Erichso
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Fig. 205 Aridius nodifer (Westwood)
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Fig. 206 Cartodere constricta (Gyll
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Twelve species of Corticaria have b
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Fig. 208 Dienerella ruficollis (Mar
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Fig. 209 Enicmus fictus Fall. Scale
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Diagnosis: Among the lathridiids di
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Fig. 212 Thes bergrothi (Reitter).
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Fig. 213 Litargus balteatus LeConte
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Diagnosis: This mycetophagid differ
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Selected reference Parsons, C.T. 19
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Distribution: Throughout the temper
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Economic importance: In Canada this
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Fig. 219 Omosita colon (Linnaeus).
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PTINIDAE spider beetles About 15 sp
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Fig. 221 Mezium affine Boieldieu. S
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Fig. 222 Niptus hololeucus (Falderm
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Distribution: Japan and introduced
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Fig. 224 Ptinus fur (Linnaeus); mal
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Fig. 226 Ptinus ocellus Brown. Scal
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The species was recorded in Canadia
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foodstuffs in the Vancouver area. I
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Fig. 229 Trigonogenius globulus Sol
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which they apparently prey; those o
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STAPHYLINIDAE rove beetles The Stap
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In North America as well as in Brit
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Economic importance: In North Ameri
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Fig. 234 Cynaeus angustus (LeConte)
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Fig. 235 Gnathocerus cornutus (Fabr
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Fig. 237 Palorus ratzeburgii (Wissm
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Fig. 238 Tenebrio molitor Linnaeus.
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Sexual dimorphism: Sexes are extern
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or 2 facets). It is most similar to
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Halstead, D.G.H. 1967. Biological s
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side margin of the head and the ant
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Figs, 248—256 (248) Anthrenus fus
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Figs. 260—263 (260) Tribolium cas
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Figs. 267—269 (267) Pseudeurostus
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facet A lens-like unit of the compo
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Fig. 270 Tenebrio molitor (dorsal v
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LITERATURE CITED Adams, R.G. 1978.
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Ghorpade, K.D.; Thyagarajan, K.S. 1
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Smith, L.B. 1962. A note on Cryptol
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coffee bean weevil ................
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pea weevil.........................
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215
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