THE ANT-LOVING BEETLES. 



311 



V. Pilopius Casey. 1897. 

 Antennas approximate at base, elavate; joints 2-4 of maxillary 

 palpi with long bristle-like appendages, the second joint bent and 

 elavate, the third transversely Innate; abdomen with second and 

 third ventrals not much longer than fourth; first four visible 

 dorsals equal in length; front femora with stiff, erect bristles, but 

 without spines. Two species are known from the State and another 

 probably occurs. 



KEY TO INDIANA SPECIES OF PILOPIUS. 



a. Pubescence rather sparse; last joint of antennae as long as the three 

 preceding combined. 

 &. Tenth antennal joint not at all longer than wide, the sixth joint as 

 long as fifth ; body stout ; elytra nearly as long as wide. 



594. LACUSTRIS. 



hi). Tenth antennal joint distinctly longer than wide. 



c. Body stout, generally dark in color; abdomen always black or 

 blackish ; thorax feebly transverse, never more than one-half as 

 wide as elytra ; fifth antennal joint slightly longer than fourth. 



10 WEN SIS.. 



cc. Body narrower, pale in color throughout, the abdomen never black- 

 ish ; elytra nearly as long as wide, rather longer than head and 

 thorax combined. 595. zimmermanni. 



aa. Pubescence dense, shorter and more scale-like; last antennal joint much 

 shorter than the three preceding combined; elytra as long as head 

 and thorax. consobrinus. 



*594 ( ). Pilopius lacustris Casey, Ann. N. Y. Acad. Sci., IX, 1897, 



619. 



Rather stout, subconvex. Dark reddish-brown; elytra, antennae and 

 legs paler. Head as wide as long; occiput with two large fovea? between 

 the eyes. Antenna) of male three-fourths the length of body, joints cylin- 

 drical, nearly equal ; of female, shorter with joints 7-10 short, transverse, 

 last joint shorter, oblong-oval. Thorax wider than long, disk with an ob- 

 long median fovea at base, reaching almost to middle, and a smaller one 

 each side. Elytra slightly wider at base than thorax, thence gradually 

 widening to apex, each with a fine, entire sutural and median stria. Ab- 

 domen convex, margin broad, tip rounded. Length 1.8 mm. (Fig. 148, d.) 



Southern half of State: common. April 5-December 23. Oc- 

 curs beneath logs and bark ; gregarious in winter. A number were 

 once swept from stems of blue-grass in May. Usually known as P. 

 piceus Lee, from which it is distinguished by its more elongate 

 and paler elytra and shorter tenth antennal joint, 



P. iowensis Casey, length 1.7 mm., was described from Iowa. 

 595 (1873) . Pilopius zimmermanni Lee, Bost. Journ. Nat. Hist., VI, 1849, 79. 



Pale brownish-yellow, sparsely pubescent. Head with frontal groove 

 not reaching the oblong frontal fovea?; occiput elevated, its fovea? larger, 



