Trigonorhinus griseus
(LeConte, 1876) 
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Source: ITIS 2012
Family: Anthribidae
Elongate, subcylindrical, piceous, densely clothed with rather coarse gray hair, verging towards ochreous in places, but without definite pattern. Head as in B. limbatus. Prothorax longer than its width at base, rounded, but scarcely narrowed on the sides as far as the middle, then more obliquely rounded and narrowed to the tip, which is rounded as usual; base broadly rounded, sinuate near the bind angles, which are acute; disc strongly punctured, but the punctures are concealed by the dense pubescence. Elytra not wider than the base of the prothorax, and about twice as long as it; striae narrow, rather finely punctured. Legs and antennae yellowish-brown, club darker. Length 3.5 mm; 0.14 inch.
Colorado, six specimens; Prof. F. H. Snow. The body is elongate as in B. variegatus; the pubescence is nearly uniform, but there are, sometimes, three paler gray vittse on the prothorax, and a broad one occupying the 5th and 6th interspaces of the elytra. The side margin produced by the flexure of the basal ridge extends nearly one-half of the length of the prothorax.
Colorado, six specimens; Prof. F. H. Snow. The body is elongate as in B. variegatus; the pubescence is nearly uniform, but there are, sometimes, three paler gray vittse on the prothorax, and a broad one occupying the 5th and 6th interspaces of the elytra. The side margin produced by the flexure of the basal ridge extends nearly one-half of the length of the prothorax.
