Beetles Identification Guide

with insecticides, and in a short time, build up large populations in a favorable
environment. The species is under strict quarantine in Canada as well as in other
countries, such as the United States. I have included it here because of its status
as one of the most feared stored-grain pests.
Trogoderma inclusum LeConte
mottled dermestid
trogoderme des denrées
Diagnosis: The species is readily separated from the other Trogoderma included
here by the medial margin of the eye being distinctly notched. In the other species
of the genus dealt with in this guide, the medial margin of the eye is entire to
slightly notched.
This species was confused with T. versicolor (Creutzer), under the latter
name, until Beal (1956) recognized the two species. Trogoderma versicolor
is exclusively European and apparently not associated with stored products
(Aitken 1975).
Sexual dimorphism: Males have a 6- or 7-segmented antennal club, females a 4or
5-segmented one.
Distribution: North America and the British Isles (Beal 1956); Aitken (1975)
added the Mediterranean region. In Canada the species ranges from coast
to coast.
Economic importance: In Canada this species is probably the most common
Trogoderma associated with stored products. It has been found in a wide variety
of animal and vegetable products but rarely in sufficient numbers to cause serious
damage. The species is regularly encountered in dried-milk factories. According
to Strong (1975), it is more likely to occur as an industrial pest, feeding
on processed dry foods and animal feed.
Trogoderma sinistrum Fall
Diagnosis: The species is distinctive among the Trogoderma included here in having
the dorsal pubescence unicolorous, brownish to piceous.
Sexual dimorphism: Males have a 6- or 7-segmented antennal club, females a 4segmented
one.
Distribution: Exclusively North American. In Canada the species has been reported
from Quebec west to British Columbia and in the Northwest Territories
and the Yukon Territory.
119