654 FAMILY XXVII. LATHRIDIID^E. 



toward apex ; sub-basal depression distinct and divided by the costae into 

 three portions; surface rather coarsely and irregularly punctate. Elytra 

 broadly impressed behind base ; striae coarsely and distinctly punctate ; in- 

 tervals convex, the third slightly, the seventh more prominently, elevated 

 at base. Length 2 mm. 



Steuben, Putnam and Marion counties; scarce. Taken while 

 sifting. April 22-June 18. 



CONINOMUS Thorn. 1863. 



Small, glabrous species, having the sides of thorax deeply 

 notched behind the middle and usually with a semi-transparent 

 whitish margin. 



C. constridus Gyll., having the elytra without tubercles, anten- 

 nal club 2-joiuted, length 1.3-1.8 mm., is a cosmopolitan species 

 known from Michigan, Illinois, etc. 



II. ENICMUS Thorn. 1859. (Gr. ; "in + moisture.") 



Small brown, black or piceous species having the eyes of normal 

 size ; thorax without ridges or costse ; prosternal spine reaching the 

 hind margin of the thorax, completely separating the epimera; first 

 and second tarsal joints of equal length. The body is somewhat 

 broader than in Lathridius and the thorax much wider in propor- 

 tion to the width of elytra. But two species have as yet been taken 

 in the State, though a number of others doubtless occur. 



KEV TO INDIANA SPECIES OF ENICMUS. 



a. Prosterual spine not elevated into a crest, the coxae more prominent. 



ft. Color usually black, legs and antennae brownish; elytral intervals 



nearly equal ; thorax transverse, front angles not lobed ; length 2- 



2.2 mm. 1257. CONSIMILIS. 



III. Color usually brown; alternate elytral intervals more convex, at 



least on sides; thorax larger, more transverse, front angles lobed; 



length 1.2-2 mm. 1258. MINUTUS. 



aa. Prosternal process elevated into a crest which reaches above (or below) 



the tips of the coxae, 

 c. Antennal club abruptly formed, the ninth joint nearly or quite as 



wide as the eighth and but slightly narrower than eleventh. 

 d. Elytra black or reddish-brown. 



e. Rows of elytral punctures equidistant. ATERRIMUS. 



ee. Rows of elytral punctures in pairs, each pair separated by a 



wider interval. DUPLICATA. 



dd. Elytra dull yellow with black markings. MACULATUS. 



cc. Antennal club much more gradually formed, ninth joint elongate- 



obconic, scarcely wider at base than eighth and decidedly narrower 



than eleventh ; elytra distinctly impressed behind the base ; head 



with median longitudinal sulcus. TENUICORNIS. 



