654 FAMILY XXVII. — LATHRIDIID/E. 



toward apex ; sub-basal depression distinct and divided by tlie costse into 

 three portions; surface rather coarsely and irregularly punctate. Elytra 

 broadly impressed behind base ; strias 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-Juiie 18. 



CoNiNOMUs Tliom. 1863. 



Small, glabrous species, having the sides of thorax deeply 

 notched behind the middle and usually with a semi-transparent 

 whitish margin. 



C. constridus G-yll., having the elytra withotit tubercles, anten- 

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

 known from Michigan, Illinois, etc. 



II. Bnicmus Thorn. 1859. (Gr., "in 4- moisture.") 



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

 size ; thorax without ridges or costs ; 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. 



KEY TO INDIANA SPECIES OF ENICMUS. 



a. Prosternal spine not elevated into a crest, the coxse more prominent. 

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

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

 2.2 mm. 1257. consimius. 



&6. 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 coxse. ■ 

 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 elytraf' punctures equidistant. ateeeimus. 



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



wider interval. dxiplicata. 



dd. Elytra dull yellow with black markings. macuiatus. 



CO. 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. 



