THE ANT-LOVING BEETLES. 315 



very small, rounded. Elytra one-half longer than thorax, sutural lines 

 deep ; discal ones fine, limited to basal half. Abdomen narrowly margined. 

 Length 2 mm. (Fig. 149, a.) 



Clark County ; rare. May 5. 



601 (1879). TYCHUS MINOR Lee., Bost. Journ. Nat. Hist., VI, 1849, 82. 



Dark reddish-brown, shining, coarsely pubescent ; antennae and legs 

 paler. Head as long as broad, convex, its fovere very minute. Antenna? 

 slightly longer than head and thorax, first two joints nearly one-half wider 

 than three to seven, which are cylindrical; eighth globular; ninth and 

 tenth larger, wider than long ; eleventh rounded-ovate, as long as the two 

 preceding. Thorax wider than long, polished, very convex ; basal foveae 

 five, the middle one the largest. Elytra faintly reticulate, sutural lines 

 fine, discal ones deep, reaching beyond the middle. Length 1.5 mm. 



Throughout the State ; scarce. April 17-October 31. Occurs 

 usually beneath stones on hillsides. One specimen, from Steuben 

 County, sifted from sphagnum moss, is much paler and is to be re- 

 ferred to var. testaceus Casey. 



Tribe II. BRACHYGLUTINI. 



The differences between this and the preceding tribe are given 

 in the key. The palpi are less developed and the last joint is oval 

 or fusiform. The following genera are probably represented in the 

 State : 



KEY TO INDIANA GENERA OF BRACHYGLUTINI. 



. Antennae 10-jointed, with a three-jointed club ; vertex with two fovese ; 

 thorax with sides rounded and with one fovea at base. 



X. DECARTHRON. 

 aa. Antenna? 11-jointed. 



1). Abdomen margined ; tarsi with a single claw. 



c. Body broad, transversely cylindrical in cross section ; margin of 



abdomen wide. 



el. Abdominal margin narrowly retuse ; two basal ventrals longer 

 than the others ; dorsal segments unequal ; last palpal joint 

 priming-knife shaped. BYTHINUS. 



dd. Abdominal margin broadly retuse; basal, dorsal and ventral seg- 

 ments much longer than others; elytra flat; last palpal joint 

 fusiform. 



e. Vertex without foveae; elytra each with two basal fovese; ven- 

 tral segments four. NISAXIS. 

 ee. Vertex with foveae. 



/. Antennae with a 3-jointed club ; vertex and thorax each with 



three foveae; elytra each with a long discal line. 

 g. Elytra each with two small basal foveae ; thorax with three 

 nearly equal foveae. 



