498 Coleopterological Notices, V. 



long fine erect and remote setae, diflfering greatly in this respect, as 

 well as antennal structure, from Chennium and Biotus. 



In all of tiiese genera the first ventral segment is short, but visible 

 from side to side behind the coxae. 



ATIWUS Horn. 



The two species of this genus may be readily distinguished by 

 the following characters: — 



Eyes smaller, between one-third and one-fourth as wide as the interocular 

 surface ; antennae longer, the basal joint as long as the next two, the ninth 

 and tenth joints much larger than the eighth, subglobose and as long as 

 wide monilicomis 



Eyes very large and prominent, fully one-half as wide as the interocular sur- 

 face ; antennae shorter, the club apparently five-jointed, the seventh and 

 eighth joints subequal in width and larger than the sixth, eighth to tenth 

 similar in form, gradually increasing in size, seventh to tenth transversely 

 oval, eleventh stout, conoidal, basal joint longer than the next two; size 

 smaller breTicornis 



The striking palpal divergences exhibited by these species have 

 been referred to under the preceding genus. I recently took several 

 specimens of monilicornis under a flat stone in the mountains of 

 western North Carolina; they were in a colony of a small slender 

 piceous-brown ant, having the antennal scape one- half longer than 

 the head, with the funicle slender and non-capitate. 



A. breTicornis n. sp. — Stout, scarcely shining, ferruginous, rather 

 densely clothed throughout with small narrow recumbent squamules. Head 

 rather wider than long, strongly constricted behind the frontal tubercle ; 

 eyes at the base, the tempora almost obsolete ; antennae but little more than 

 one-half as long as the body, the basal joint cylindrical, twice as long as wide, 

 with rugose sculpture. Prothorax two-thirds wider than long, distinctly wider 

 than the head ; sides feebly divergent from the base to the middle, then more 

 strongly convergent to the apex which is broadly truncate and three-fourths 

 as wide as the base ; three pubescent foveas shallow, not extending beyond 

 basal third. Elytra large, not quite as long as wide, fully twice as long and 

 wide as the prothorax ; humeri broadly rounded, obtuse, feebly elevated, the 

 humeral width nearly four-fifths of the subapical ; sutural stria deep, discal 

 evanescent near apical fourth. Abdomen distinctly narrower than the elytra 

 but nearly as long ; border strong ; surface even ; segments subequal in 

 length. Legs rather stout ; posterior tibiae strongly swollen toward apex. 

 Length 2.0 mm. ; width 0.9 mm. 



