Beetles Identification Guide

9(8) Eye about 3 facets wide laterally (as in Fig. 148). Pronotum with lateral
margin subparallel toward posterior angle, basal bead usually incomplete
at middle (Fig. 162). [Length of body 5.5—7.0 mm; habitus Fig. 231]
.................................................................. Alphitobius diaperinus (p.173)
Eye about 1 facet wide laterally (as in Fig. 149). Pronotum with lateral
margin rounded toward posterior angle, basal bead complete (Fig. 163).
[Length of body 4.5—6.7 mm] ................ Alphitobius laevigatus (p.175)
10(8) Eye 1 or 2 facets wide laterally (as in Fig. 149). Male with conspicuous
projection on each mandible (Fig. 235). Length of body 3.5—4.5 mm.
[Habitus Figs. 235 and 236] ....................... Gnatocerus cornutus (p.180)
Eye 3 or 4 facets wide laterally (as in Fig. 148). Male without projection
on mandible. Length of body 5—6 mm. [Habitus Fig. 234] .................
.......................................................................... Cynaeus angustus (p.177)
11(7) Eye 3 or 4 facets wide laterally (Fig. 148). Antenna with moderately
compact 3-segmented club (Fig. 165) .................................................12
Eye 1 or 2 facets wide laterally (Fig. 149). Antenna with loose 5- or 6segmented
club (Fig. 166) ....................................................................14
12(11) Eye larger, extended ventrally to level of maxillary fossa (Fig. 156). Last
antennal segment arcuate (Fig. 167). Dorsum reddish brown. [Length
of body 2.3—4.4 mm] ............................... Tribolium castaneum (p.187)
Eye smaller, not extended ventrally to level of maxillary fossa (Figs. 157
and 158). Last antennal segment subtruncate (Fig. 168). Dorsum dark
brown or black ......................................................................................13
13(12) Prosternum slightly depressed in front of intercoxal process. Frons with
punctures denser, usually separated by distance shorter than diameter
of puncture (Fig. 152). Eye smaller, more or less rounded ventrally (Fig.
157). [Length of body 2.8—4.5 mm] .............Tribolium audax (p.186)
Prosternum slightly convex in front of intercoxal process. Frons with
punctures sparser, usually separated by distance greater than diameter
of puncture (Fig. 153). Eye larger, more or less oval ventrally (Fig. 158).
[Length of body 3.9—5.1 mm] ..................... Tribolium madens (p.189)
14(11) Length of body 4.5—5.7 mm. Margin of gena rounded at level of eye
(Fig. 154). Pronotum usually widest at middle or behind ......................
.....................................................................Tribolium destructor (p.189)
Length of body 2.6—4.4 mm. Margin of gena subangulate at level of
eye (Fig. 155). Pronotum usually widest before middle. [Habitus
Fig. 239] ..................................................... Tribolium confusum (p.187)
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