230 GEO. H. HORN, M. D. 



This species could only be mistaken for patella, but it has less densely 

 punctured elytra, which are also more shining. The male sexual charac- 

 ters are also different. 



Occurs in the District of Columbia. 



A. puncticeps n. sp. — Form moderately elongate, black, shining; legs pice- 

 ous ; antennae brown, not as long as the head and thorax, joints all longer than 

 wide ; head quadrate oval, with very numerous punctures behind the eyes and on 

 the under side; thorax very little longer than wide, not wider than the head, not 

 narrowed behind; sides scarcely sinuate; surface shining, punctures coarse not 

 numerous, arranged in three series on each side, the inner quite regular, and com- 

 posed of seven or eight punctures ; elytra scarcely wider than the thorax and very 

 little longer, conjointly a little longer than wide; surface sub-opaque, densely 

 punctured, sparsely pubescent; abdomen feebly shining, moderately densely 

 punctulate; beneath as above. Length .16 — .18 inch; 4 — 4.5 mm. 

 - iV/a/e.— Anterior tarsi slightly dilated ; last ventral with very slight emargina- 

 tion. 



Female. — Anterior tarsi very slightly dilated ; last ventral entire. 



This species recalls nanus in appearance, but differs greatly in various 

 details. Among the species with the broader thorax it may be known 

 by the numerous punctures at the sides and beneath the head. 



Occurs in the southern part of California. 



A. parcus n. sp. — Black, shining; antennse brown; legs testaceous; antennae 

 slightly shorter than the head and thorax, slightly thicker externally, brown, ter- 

 minal joints paler, joints all at least as long as wide; head oval, sparsely coarsely 

 punctured at the sides; beneath sparsely punctate, alutaceous; thorax scarcely 

 wider than the head, very little longer than wide; sides very slightly sinuate; 

 surface very ehining with the punctures arranged in three series, the middle one 

 composed of seven coarse punctures arranged in a regular series; elytra a little 

 wider and longer than the thorax, conjointly but little longer than wide; surface 

 shining, coarsely punctate, sparsely pubescent; abdomen moderately shining, 

 punctures less coarse than on the elytra; beneath somewhat more shining and 

 more distinctly punctured, margins of the segments paler. Length .14 inch; 'i.b 

 mm. 



Male. — Anterior tarsi moderately dilated ; last ventral with a barely perceptible 

 emargination. 



Female. — Anterior tarsi scarcely dilated ; last ventral entire. 

 This species resembles greatly some of the smaller forms of nigrihdus, 

 but may be known by the tarsal structure and the thoracic punctures. 

 Occurs from Michigan to the District of Columbia. 



A. ,pui!iio n. sp. — Piceous, shining; antennas piceous, terminal joint pale, 

 shorter than the head and thorax, joints 6-10 as wide as long; head oval, sparsely 

 punctate at the sides; beneath sparsely punctate, shining; thorax shining, not 

 wider than the head, very little longer than wide; sides feebly sinuate, punctures 

 arranged in three irregular series on each side, the inner series sinuous, composed 

 of seven or eight punctures; elytra a little wider than the thorax and notably 



