AMERICAN COLEOPTERA. 121 



It occurs rather abundantly from the ^liddle States to Kansas, those 

 from the western region being smaller. 



Group G contains a single species, differing from all our species in 

 appearance, in having tlie thorax notably narrower behind and the 

 hind angles broadly rounded. The elytra are oval, narrower at base 

 than at middle, at the bases of the thorax and elytra apparently more 

 distant than in any other of our species. The head is moderately con- 

 vex, not tuberculate, clypeus rather deeply emarginate and on each 

 side elevated into a very distinct acute tooth. The base (if thorax is 

 distinctly margined, the mesosternum feebly carinate, and the anterior 

 tibial not serrate above the upper tooth. First joint of hind tarsi 

 slightly longer than the second and third together. No remarkable 

 sexual characters have been noticed. 



A. nevadensis, n. sp. — Moderately elongate, black, shining. Head moder- 

 ately convex, not tuberculate, rugose, especially in front and at sides, broadly 

 rounded in front, gense moderately prominent; clypeus emarginate and on 

 each side distinctly denticulate. Thorax rounded and narrower behind, hind 

 angles broadly rounded, base broadly rounded and distinctly margined ; sur- 

 face finely not densely punctured, with coarser punctures intermixed, more 

 numerous at the sides. Elytra oval, humeri rounded, surfaced' istinctly striate, 

 striae feebly punctured at base, more distinctly toward apex, interstices feebly 

 convex and sparsely punctulate. Body beneath black, mesosternum in front 

 of coxse coasely punctured or cribrose, between coxae carinate. Legs rufo- 

 piceous, antennae luteous. Length .22 — .30 inch; 5.5 — 7.5 mm. 



This species is readily known by the characters given. The wings 

 are very feebly developed. It varies in color from black to brown. In 

 some the elytral stria) are fainter, the interspaces flatter and impunc- 

 tured. 



Specimens were collected inXevadaby Mr. Gabb ; others have been 

 sent by Mr. Henry I^dwards. probably from the same region. 



Group H contains two small elongate species characterised by the 

 absence of the basal prothoracic line. The gena5 are very feebly pro- 

 minent. 



A. lividus. Oliv. Ent. i. .'',, p. 8fi, pi 26, fig. 222. Erichs. Ins. Doutsch..3, p. S.37. 

 — Elongate, pale testaceous ; head, disc of prothorax and elytra, and sutural 

 narrow space, brownish. Length .18 — .20 inch ; 4.5 — 5 mm. 



Introduced from Europe, occurring in our Southern States, as far 

 west as New Mexico. 



A. vestiarius, n. sp.— Elongate, piceous-black; margin of head, sides of 

 thorax, sutural and lateral margins of elytra piceo-rufous, shining. Head 

 distinctly tuberculate, middle tubercle elevated into a very short horn, surface 

 sparsely punctured at the margins, more densely on the front; clypeus dis- 

 tantly emarginate, gense not jarominent. Thorax broader than long, convex. 



