52 JOHN B. SMITH. 



Base of thorax distinctly bisinuate. 



Thorax widest behind middle, distinctly narrowed at base. 



Surface pubescent, thorax greatly narrowed, 2 mm cordatnm. 



Not pubescent, thorax less narrowed behind, 1.5 ram capitatuni. 



Thorax widest at base. 



Head wide, eyes distinct, and rather prominent, 1.5 mm oblitnm. 



A. califoriiicuin n. sp. — Black, antennae piceous, form narrow, ovate. 

 Head broad, coarsely punctured ; eyes globose, prominent; antennae inserted near 

 base of rostrum ; basal joint equal to second and third ; thorax about as long as wide : 

 widest before base; sides sinuate, densely and coarsely punctured, with a longitu- 

 dinal foveate puncture at base. Elytra regularly ovate; striae wide and shallow; 

 punctures distant, intervals moderate, very finely punctate. Beneath coarsely 

 and rather distantly punctured. Length 2 mm. 



Hah. — California. 



f]asily distinguished from the others in this section by the want of 

 humeri. Described from a single specimen ( 'S ?) in Dr. Leconte's col- 

 lection. A second specimen received long afterward from Mr. Bolter, 

 of Chicago, labelled " 1750 feet Geysers Cal., May 21." Agrees very 

 well with the type except that the rostrum is much longer; scarcely 

 attenuate toward tip, and the body much more robust ; the specimen is 

 evidently a 9 , and has the same dull and rather sordid appearance of 

 the type, so that the most cursory examination refers it to this species at 

 once ; meanwhile the characters of the rostrum and body in the descrip- 

 tion are. most applicable to the % . 



A. decoloratum. n. sp.— Black; antennae and legs piceous; legs often 

 paler, usually rufous. Head longer than wide, densely punctured ; eyes convex, 

 but scarcely prominent; rostrum short and stout; antennae short; basal joint 

 scarcely longer than second, and not so stout. Thorax as long as wide ; widest at 

 base; sides rounded, grossly punctured, and with a short impressed line at base. 

 Elvtra humeri moderate; striae evident, punctures distinct, intervals convex, 

 scabrous. Beneath moderately punctured. Length 2 mm. 



Hah.—^. C, D. C, Ariz., Md., Va. 



Distinguished at a glance from the others in this section by the red legs. 



A. concoloratum n. sp.^Black ; head elongate, rugose, and punctured ; 

 eyes large, but occasionally prominent; rostrum distinctly dilated near base; 

 thorax as before. Elytra broadly oval ; striae wide and deep ; punctures pro- 

 found ; intervals narrow and convex. Length 1.5 mm. 



^ai._Cal., W. Va., Ga., Mich., Fla. 



Rather obscurely characterized, and distinct rather by an aggregation 

 of small diiferences than by any striking peculiarity. 



A. cariiiatuiii n. sp. — Entirely black, very robust. Head transverse, 

 densely punctured: carinate between the eyes, which are not prominent; an- 

 tennae short; thorax wider at base than long; densely and grossly punctured. 



