1246 



FAMILY LV. TENEBRIONIDJE. 



not received in the thorax as far as the eyes, which are transverse 

 and einarginate ; front feebly dilated on the sides, covering the base 

 of mandibles; antenna gradually thickened toward tips; elytra em- 

 bracing feebly the flanks of the abdomen; legs long; tibial spurs 

 small. Seven of the 18 recognized genera are known to be repre- 

 sented in the State, while members of another perhaps occur. They 

 live, for the most part, beneath the bark of dead trees. 



KEY TO INDIANA GENERA OF TENEBRIONINI. 



a. Tarsi densely clothed beneath with fine, short, silken pubescence. 



I). Antennre distinctly shorter than head and thorax, their outer joints 

 transverse, the last joint snbqnadrate, rounded at tip. 

 c. Epipleura? entire, narrower at apex ; length 15 or more mm. 

 d. Sides of mentnm with small inrlexed lobes; thorax not narrowed 

 at base. I. Xyctobates. 



del. Sides of mentnm without lobes: thorax narrowing behind and 

 crenulate on the sides. Iphthimus. 

 cc. Epipleuree not reaching the tips of elytra. 



c. Femora strongly club-shaped, black, shining; larger, 1S-26 mm. 



II. Merinus. 



ee. Femora slender, in our species reddish-brown: smaller, not over 



11 mm - III. IlAPLA NDRUS . 



b~b. Antennae more slender, as long as or longer than head and thorax, 

 the outer joints triangular, the last one oval, more or less acute. 

 f. Front margin of front of head thickened and slightly reflexed. 



IV. SCOTOBATES. 



//. Front margin of front not thickened or reflexed. V. Xyeopinus. 

 aa. Tarsi rather sparsely clothed beneath with coarse pubescence. 



g. Epipleurre entire ; form more or less convex : length 10 or more mm. 



VI. Tenebrio. 



gg. Epipleurse abbreviated ; head transverse ; form much flattened ; length 



5 ~ 6mm - VII. DOLIEMA. 



I. Ntctobates Ghierim 1834. ( Gr., ' 1 night + walker. ") 



Large black or piceous elongate forms, separated from allied 

 genera only by the characters given in the generic key. Two of the 

 three known species occur in the State. 



KEY TO INDIANA SPECIES OF NYCTOBATES. 



a. Under side of mentnm smooth ; elytra] rows of punctures fine. 



2302. PENNSYLVANIA. 



a a. Under side of mentnm with a tuft of rather long yellowish hairs ; ely- 

 tral punctures much coarser. 2303. barbata. 



