AMERICAN COLEOPTERA. 25 



A. august icollis, n. sp. — Form slender, color ferruginous, sparsely 

 clothed with short cinereous pubescence. Head coarsely but not densely 

 jiuiictured, vertex slightly impressed. Eyes more prominent than the sides of 

 thorax. Antennae feebly serrate, three basal joints only hairy, second joint 

 small, oval, third similar to and nearly as long as the fourth. Thorax quad- 

 rate or slightly longer than wide, sides parallel not margined, hind angles acute 

 strongly, sometimes very suddenly divergent, acutely carinate, surface convex, 

 sparsely punctured. Elytra as wide at base as thorax, elongate, feebly convex, 

 sides very feebly arcuate, gradually narrowing to apex, surface obsoletely 

 striate, intervals feebly convex, moderately densely punctured and sparsely 

 pubescent. Body beneath darker than above and similarly punctate and 

 pubescent. Tarsi slender, as long as their respective tibiae, hind tarsi some- 

 what longer. Length ,50 — .56 inch; 11.5 — 14 mm. 



This species is the most slender of the genus and is readily known 

 by the characters in the table. 



In the terminal ventral segment several characters are plainly visi- 

 ble. In those, which I take to be males, the last ventral segment 

 has the sides slightly oblique near the tip, while the tip is feebly 

 emarginate, in the other sex the segment is oval at tip and entire. 



Numerous specimens were taken by Mr. Crotch, at San Die^o, 

 California. 



A. tenuirormis. n. sp. — Form slender, color piceo-testaceous or ferrucrjn- 

 ous, sparsely clothed with fine cinereous pubescence. Head coarsely and 

 moderately densely punctured. Eyes not more prominent than the sides of 

 thorax. Antennae strongly serrate, sparsely clothed with short erect hairs, 

 second and third joints small, globular and nearly equal in size, and together 

 scarcely longer than half the fourth. Thorax subquadrate, slightly longer 

 than wide, sides very feebly arcuate and slightly divergent, not margined, 

 hind angles acute, moderately strongly divergent and acutely carinate, sur- 

 face convex, coarsely but not densely punctured, median line usually feebly 

 impressed. Elytra as wide at base as thorax, sides gradually narrowing to 

 base, surface moderately convex, obsoletely or not at all striate, interval scabro- 

 punctate. Body beneath more shining than above, sparsely punctulate and 

 pubescent. Tarsi slender as in the preceding specie?. Length .44— .50 inch; 

 11—12.5 mm. 



The males have the sides of the last ventral segment slightly ob- 

 lique near the tip and the tip truncate. 



The three specimens in my cabinet are from Nevada and parts of 

 California unknown to me. 



A. corymbitoides, n. sp.— Piceous, moderately shining, sparsely clothed 

 with short, grayish silken pubescence. Head densely and coarsely punctured. 

 Antennae strongly serrate, with short erect pubescence, joints 2, 3 small, oval, 

 the third somewhat the larger and together not longer than half the fourth. 

 Thorax slightly longer than wide, convex, coarsely but not densely punctured, 

 median line feebly impressed, sides not margined, anteriorly feebly arcuate, 

 hind angles moderately divergent, carinate. Elytra as wide as thorax, sides 



TRANB. AMKR. ENT. SOC. (4) FKBBUARY, 1874. 



