1880.] J-'*^ [Horn. 



In the male the first four joints of tlie anterior tarsi are dilated (the first 

 joint rather feebly) and pubescent beneath, middle tarsi less dilated, the 

 first joint not pubescent, the next three pubescent. In the female the an- 

 terior and middle tarsi are slightly dilated but not pubescent beneath. 



The males are usually entirely piceous in color, while in the females the 

 elytra are brownish-testaceous with a large, darker discal space. There 

 are however exceptions in both sexes. This species has heretofore been 

 considered a variety o? pitychrous, but beside the clypeal setae, the present 

 species differs in the absence of punctures on the alternate intervals near 

 the tip, and the entire absence of any metallic surface lustre. 



Occurs in Nevada, northern California, Oregon and Vancouver. 



24. A. discoideus Dej. Form oblong, moderately elongate, piceous, 

 sides of thorax and elytra and legs testaceous. Head piceous, clypeus with 

 two setigerous punctures on each side. Thorax very little wider than 

 long, narrowed at base, sides arcuate in front, sinuate posteriorly, hind 

 angles sharply rectangular, side margin very narrowly depressed, disc 

 moderately convex, smooth, punctured along the base, basal impressions 

 short and deep. Elytra wider than the thorax, rather deeply striate, 

 intervals slightly convex and smooth. Body beneath smooth, intercoxal 

 process slightly punctulate. Length .44 inch ; 11 mm. 



The anterior tarsi of the male are not broadly dilated and the first joint has 

 very little pubescence at tip, the middle tarsi are rather slender, the first 

 joint glabrous, the next three feebly pubescent. In the female the anter- 

 ior and middle tarsi are scarcely broader than the posterior. 



Occurs from Pennsylvania to Missouri. 



25. A. baltimorensis Say. Piceous, legs and elytra pale, the latter with 

 darker discal cloud. Form and general characters of discoideus but more 

 depressed and less shining. Length .36 — .40 inch ; 9 — 10 mm. 



The anterior and middle tarsi of the male are more broadly dilated, 

 otherwise the sexual characters are as in discoideus. 



I adopt or rather retain Say's name for this species in preference to the 

 older one of Fabricius. I can see no advantage in respecting priority in a 

 case of this kind, as the older name carries with it an erroneous locality. 



Occurs nearly everywhere in the Atlantic region. 



26. A. pitychrous Lee. Form of the preceding, but a little more con- 

 vex, with the surface varying from violaceous to greenish, the general color 

 piceous. Thorax similar in form to baltimorensis but less broad, a little 

 more convex and usually less punctured at base. Elytra also similar in 

 form but more parallel, the strine fine, the intervals flat and at apex 2 — 4—6 

 are distinctly punctured. Body beneath and legs piceous. Length .34 — 

 .38 inch ; 8.5—9.5 mm. 



Sexual characters as in baltimorensis. 



Closely related to the next species, but differs in the punctuation of the 

 elytral intervals and by the smooth head and absence of coarse punctures 

 from the apex of the thorax. 



Occurs from Colorado westward to California and Oregon. 



