52 OTIORHYXCHID^. 



[Horn. 



A. alternata, n. sp. 



Oblong oval, surface densely covered with brownish cinereous hairs, the 

 alternate intervals of the elytra paler. Head and rostrum as long as the 

 thorax, sparsely punctured and Avith erect yellowish hairs, surface densely 

 covered with cinereous scales, brownish at the sides ; rostrum with a short 

 median impression between the insertions of the antennae. Thorax cylin- 

 drical, verj'^ slightly broader than long, sides moderately arcuate, surface 

 densely covered with cinereous scales, slightly clouded at middle, with few 

 erect hairs ; when deprived of scales the surface consists of flattened punc- 

 tured granules, moderately densely placed. Elytra oblong oval, one-third 

 longer than wide, humeri obtusely rounded, surface striate, striae with 

 punctures of moderate size, not closely placed, intervals flat, densely 

 covered with cinereous scales, each alternate interval darker at basal half 

 and irregularly clouded near the apex, each interval with two very irregu- 

 lar rows of erect hairs. Body beneath not very densely covered with 

 cinereous scales and with few hairs. Legs with densely placed scales and 

 sparsely placed hairs longer than those of the surface. Length .26 inch ; 

 5.5 mm. 



This species from its densely scaly surface has a greater superficial re- 

 semblance with decorata than the species near which it is placed, but from 

 its having rather conspicuous erect hairs on the entire upper surface it 

 must be placed here. 



Two specimens, Montana. 



A. sordida, n. sp. 



Form oblong oval, resembling granicolUs, surface densely covered with 

 brownish scales, indistinctly variegated with brownish spots and with 

 rather short hairs. Head and rostrum as long as the thorax, moderately 

 densely and coarsely punctured, rostrum distinctly sub-carinate above, 

 surface very sparsely scaly and hairy. Thorax nearly spherical with apex 

 and base truncate, lobes extremely short, disc moderately convex, finely 

 and not closely granulate, each granule punctured at summit, surface 

 sparsely scaly and hairy. Elytra regularly oval, one-half broader at middle 

 than the thorax, base feebly emarginate, humeri entirely obliterated, disc 

 moderately convex, finely striate, striae with elongate punctures, intervals 

 flat, densely scaly and with two rows of pale-brownish hairs of moderate 

 length. Body beneath moderately densely punctured, sparsely hairy. 

 Legs with very few scales, sparsely hairJ^ Length .34 inch ; 8.5 mm. 



The form of this species is very nearly that of granicolUs, but with flat 

 elytral intervals and without rectangular humeri. 

 One specimen, California (or Oregon). 



A. decidua, n. sp. 



Form oblong, surface moderately covered with pale-brownish, easilj' re- 

 moveable scales and with brownish erect hairs. Head and rostrum slightly 

 longer than the thorax, densely and coarsely punctured, sparsely scaly and 

 hairy, scales at sides and tip cupreous, rostrum above, carinate. Thorax 



