Beetles Identification Guide

those of C. distinguendus Sturm, a species introduced in North America and
known in Canada only in British Columbia. Compared with C. pilosus, adults of
C. distinguendus are normally smaller (1.6—2.2 mm) and usually have the lateral
tooth slightly behind the middle of the side. Although many specimens of both
species are separated by these characteristics, some can be determined only by
examination of the male genitalia. Members of C. distinguendus have been found
associated with stored products in Europe.
Sexual dimorphism: Males have 4-segmented hind tarsi, females 5-segmented
ones (Fig. 244).
Distribution: More or less cosmopolitan (Woodroffe and Coombs 1961). In
Canada the species has been recorded from Ontario west to British Columbia.
Economic importance: As mentioned for the family.
Cryptophagus saginatus Sturm
Diagnosis: Because of the uniformly reddish brown body, the anterior angles of
the pronotum not drawn out posteriorly, and the single elytral pubescence, C.
saginatus can be confused, among the species of Cryptophagus dealt with here,
only with C. scutellatus and C. subfumatus. It differs from C. scutellatus mainly
by its larger size (length more than 1.9 mm) and in having denser pronotal
punctation (punctures separated by one-half to three-quarters of their diameter)
and from C. subfumatus mainly in having the anterior angles of pronotum
not prominent anteriorly and the lateral tooth located in front of the middle of
the side.
Sexual dimorphism: Males have 4-segmented hind tarsi, females 5-segmented
ones (Fig. 244).
Distribution: Europe, northern Asia, and North America, where it is probably
introduced. According to Coombs and Woodroffe (1955), C. saginatus is one of
the commonest species indoors in Great Britain as well as being abundant in the
wild. In Canada the species has been found in Ontario and British Columbia.
Economic importance: As stated for the family. The species has been recorded
on Canadian cargo ships carrying soybean meal (Aitken 1975).
Cryptophagus scanicus (Linnaeus)
Diagnosis: The species differs from the other Cryptophagus with single elytral
pubescence in having the anterior angles of the pronotum not drawn out
posteriorly and the dorsum of body bicolorous, the head and pronotum being
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