AMERICAN COLEOPTERA. 305 



founded with difforme but differs by the fbrm of the clypeus and the 

 more finely impressed sutural stria. For the discovery of this species 

 T am indebted to Mr. F. Blanchard of Lowell, Massachusetts. 

 Occurs in the White Mountains, New Hampshire. 



A. concinnum Mann. — Broadly oval, very convex, contractile, colo"r 

 variable from testaceous to piceous. Head sparsely finely punctulate. Thorax 

 more than twice as wide as long, narrowed in front, apex moderately einar- 

 ginate, sides moderately, base strongly arcuate, hind angles broadly rounded, 

 surface sparsely obsoletely punctulate. Elytra very broadly oval, scarcely 

 longer than wide, base on each side slightly oblique, humeri rounded, surface 

 coarsely not densely punctured, sutural stria long, moderately deeply iii>- 

 pressed. Body beneath sparsely punctulate, abdomen a little more coarsely. 

 Length .08— .12 inch; 2—3 mm. 



Male. — Anterior and middle tarsi slightly dilated. Tarsi 5 — 5 — 4. 



Female. — Tarsi slender 5 — 4 — 4. 



With this species I unite cfflaena Mann., after a comparison of types 

 from that author. The punctuation varies somewhat but not beyond 

 the ordinary limits. 



Occurs from California and Nevada northward to Alaska. 



A. rotunduluin Mann. — Oval, very convex, contractile, piceous, margins 

 often paler. Surface absolutely smooth, elytra without sutural stria. Thorax 

 as in concinnum. Base of elytra very oblique and forming a very distinct 

 angle with the sides. Body beneath sparsely punctulate. Length fully ex- 

 tended .08 inch; 2 mm. 



Sexual characters unknown, the two specimens from Mannerheim 

 now before me are in such condition that I cannot safely determine 

 the number of tarsal joints. 



Two specimens, Alaska. 



A. angulare Mann. — Broadly oval, not very convex, semi-contractile, 

 piceous, moderately shining. Head minutely punctulate. Thorax much more 

 than twice as wide as long, narrower in front, apex feebly emarginate, sides 

 and base arcuate, hind angles rounded, surface moderately densely but very 

 minutely punctulate. Elytra oval, a little longer than wide, base on each side 

 slightly oblique, humeri distinct, sutural stria long, moderately impressed, 

 surface finely but not densely punctulate. Body beneath very sparsely finely 

 punctulate. Length .14 inch; 3.5 mm. 



Male. — Anterior and middle tarsi slightly dilated. Tarsi 5 — 5 — 4. 



Female. — Tarsi slender 5 — 4 — 4. 



As in all the species which follow the margin of the front is appa- 

 rently emarginate, the front edge of the clypeus being membranous. 

 The mandibles of male are normal. 



Two specimens, Alaska and Colorado. 



A. politum Lee. — Oval, very convex, contractile, color variable from rufo- 

 ferruginous to piceous, shining. Head smooth. Thorax more than twice as 

 wide as long, narrowed in front, apex moderately deeply emarginate, sides 



TRANS. AUER. ENT. SCO. Till. (39) OCTOBER, 1880. 



