J246 FAMILY LV. — TENBBEIONID^. 



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

 and emarginate; front feebly dilat.'d on the sides, covering the base 

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

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

 small. Seven of the 1.8 recognized "-..nera 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 TENEBKIONINI. 



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



6. Antennffi distinctly shorter than head and thorax, their outer joints 

 transverse, the last .ioint subquadrate, rounded at tip. 

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

 d. Sides of mentum with small inflexed lobes ; thorax not narrowed 

 at base. I- Nyctobates. 



del. Sides of mentum without lobes; thorax narrowing behind and 

 erenulate on the sides. ipi-iTi-inius. 



cc. Bpipleuraj not reachin;; the tips of elytra. 



c. Femora sti-ongly club-shaped, black, shining; larger, lS-26 mm. 



II. Merinus. 



ec. Femora slender, in (lur species roddish-brown ; smaller, not over 



11 mm. Il^I- Haplandrus. 



66. 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. PCOTOBATES. 



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

 0(7.. Tarsi rather sparsely clothed beneath with coarse pubescence. 



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



VI. Tenebrio. 



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



5-6 mm. VII. Doliema. 



I. Nyctobates G-uerin. 1S3-I-. (Gr., "night -i- 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 NYC 1 ORATES. 



a. Under side of mentum smoofli : clytral rows of punctures fine. 



i;:;oi:, i'knnsyi.vaxica. 



aa. Under side of mentum with a tuft of rather long yellowish hairs ; cly- 



tral punctures much coarser. 2303. barbata. 



