128 GEORGE H. HORN, M. D. 



ately convex, feebly striate, striae with very fine punctures, interspaces flat, 

 smooth. Body beneath similar in color to the elytra. Mesosternum flat, hind 

 tibiffi rather stout. Length .16 inch ; 4 mm. 

 Occurs in North Carolina. 



A. consentaneus, Lee. Agass. Lake Super, p. 225. — Moderately elonsjate, 

 shining, yellowish testaceous. Head sparsely punctured, more densely at the 

 sides and in front ; clypeus feebly eraarginate and on each side broadly rounded, 

 Thorax moilerately convex, disc feebly punctured, more densely at the sides. 

 Elytra elongate oval, moderately convex, rather deeply striate, striee serrately 

 punctured, interspaces moderately convex, sparsely and finely punetulate. 

 Beneath pale yellowish testaceous. Hind tibise slender. Anterior tibise norm- 

 ally tridentate. Length .20 inch : 5 mm. 



The thorax and head are usually darker than the elytra, the disc of 

 this foi'mer being slightly clouded with rufous. Resembles superfici- 

 ally j[>7ioZer<'oM7e6', the differences will be given under that species. 



Occurs in Canada, Missouri and Kansas, but is not common. 



A. politus, n. sp. — Oblong, smooth, shining, pale ferruginous and bi'oadly 

 rounded on each side. Thorax moderately convex, smooth, shining and with 

 few very coarse punctures as the sides; sides moderately rounded, hind angles 

 broadly rounded, base not margined. Elytra moderately convex, shining, 

 faintly striate, strioe very finely punctured, intersjiaces flat, smooth, impuue- 

 tured. Body beneath pale ferruginous, smooth shining. Hind tibise stout. 

 Spur of anterior tibia of male broad spatulate and truncate at tip. Length .32 

 inch : 8 mm. 



The lateral margin of the thorax is more distinctly reflexed than in 

 either of the following species and more broadly at the basal angle so 

 that immediately in front of the hind angle the thorax is slightly con- 

 cave. It is remarkable that one of the characters of the males of 

 Group B should reappear in this species. The hind tarsi are slender 

 and the first joint nearly as long as the three following. 



The unique in my cabinet is from Texas. 



A. rubidus, Lee. Pacif. E. R. Rep. App. i, p. 41. — Length ..30 — .35 inch ; 7.5 — 

 9 mm. 



Occurs near San Francisco and southward ; not rare. 



A. concavas, Say, Journ. Acad, iii, 1S23, p. 214, kcvigatus, Hald. Journ. xVead. 

 Ser. ii, vol. i, p. 103. 



These two species resemble each other closely but may be readily 

 distinguished by the thorax of the former being very coarsely but 

 sparsely punctured over its entire surface while the latter has punc- 

 tures only at the sides. The clypeus of )-itLidiis is also more distinctly 

 angulate on each side of the euuirgination. Both species are shining 

 ferruginous or brown. Elytra rather deeply striate and finely serrate- 

 ly punctured. Interspaces feebly convex and nearly smooth. Inner 



