186 NORTH AMERICAN 



Florida (various localities), 18. 



This is the smallest species of the genus, and is remarkable for the 

 large eyes and strong punctuation of the dorsal surface of the abdo- 

 men. 



30. A. calloSUS (Er.) — Form rattier slender, sub-cylindrical. Pubescence 

 rather sparse and inconspicuous, longer on the abdomen, where it is slightly- 

 denser, cinereous. Body very highly polished. Head small, twice as wide 

 as long ; interocular surface twice as wide as the eye, flat ; sulcations broadly 

 rounded, rather faint ; supra-antennal tuherculations elongated, impunctate; 

 surface between the sulcations highly polished and impunctate; punctures 

 small, confusedly crowded in the sulcations ; ocular lines meeting at about 

 one length in advance ; antennae distinctly longer than the width of head, 

 slender, pale piceous-brown, distal ends of the joints darker, club moderate, 

 much darker ; third joint nearly one-half longer than the fourth, joints of 

 club increasing in length and width ; maxillary palpi very long and slender, 

 flavate throughout. Prothorax arcuately, evenly, and extremely gradually 

 increasing in width for two-thirds the length posteriorly, where it is very 

 slightly narrower than long ; sides thence very feebly convergent and dis- 

 tinctly sinuate ; anterior and posterior margins nearly equal in length, the 

 former distinctly areuate, the latter nearly straight ; surface rather finely 

 and evenly punctate ; p#nctures generally separated by less than their own 

 widths, a fusiform space in the middle of the disk impunctate. Elytra at base 

 slightly wider than the head; sides nearly parallel, very strongly arcuate 

 near the apices, much less so near the humeri, very slightly longer than the 

 width at base; together broadly and moderately emarginate behind ; suture 

 nearly one-fifth longer than the pronotum ; surface very feebly impressed on 

 the suture toward the base, finely and evenly punctate ; punctures round, 

 impressed, distant by nearly twice their own widths ; interspaces convex, ex- 

 tremely highly polished. Abdominal segments decreasing nearly uniformly 

 and somewhat rapidly in width, first distinctly narrower than the contiguous 

 elytra, cylindrical; border obsolete ; strongly constricted at base; surface 

 finely, distantly, and irregularly punctulate ; transverse carinae not cusped. 

 Legs long and slender, pale piceo-flavate, tips of femora darker, tarsi rather 

 short ; first joint of posterior as long as the next two together ; fourth joints 

 strongly bilobed. 



Male. — Posterior edge of the fifth ventral segment emarginate in its middle 

 fourth, emargination rather feeble, more acutely rounded at bottom, nearly 

 eight times as wide as deep ; sixth segment very broadly incised at apex, 

 incisure occupying the entire apex, nearly four times as wide as deep, sides 

 straight. 



Female. — Sixth segment evenly rounded behind. 



Length 3.0-3.2 mm. 



Florida, 19 ; Louisiana, 1 ; District of Columbia, 2. 

 Readily recognized by its very pale legs and distinct sexual char- 

 acters. It is peculiarly southern in its habitat. 



