THE DARKLING BEETLES. l-{)7 



KKV TO GE.NERA OF BOLETOrilAOINI. 



(/. Aiiteiuiii' lO-joiuted; e.\os not entirely dividGrl. 



XXni, BOLETOTIIKRUS 



"('. Antennu' ll-jomtecl ; e.ws comiiletely divided. XXIV. Boletophabi s. 



XXIII. BoLETOTHERUs Candeze. ]861. (Gr., " fungus + to 



hunt." 



In this genus the males have two horns, slightly curved and 

 broader at tip, projecting forward from the thorax, and a short 

 horn, bifid at tip, on the clypeus. The females have the thorax 

 strongly tuberculate. One species is known. 



2346 (TS-IO). BoLETOTHEKUs BiFUEcus Fab.. Ent. 

 Syst. Supp., I, 179S, 40. 

 Oblung, robust. Black or brownish-black, 

 opaque. Thorax three times as broad as long, mar- 

 gins broadly flattened and serrate with rounded 

 teeth ; the disk with horns or tubercles as above 

 mentioned. Elytra each with four rows of large, j.^^ 555 y ^ 



irregular tubercles with smaller ones on the inter- (After Emmcns ) 



vals. length 10-11.5 mm. (Pig. 565.) 



Throughout the State ; frei|uent. May 4-October 17. When dis- 

 turbed they feign death, their form and roughened surface blending 

 with the irregularities on the surface of the fungi in such a manner 

 as to render the beetles almost invisible. 



XXIV. BoLETOPi-iAGUS Illig. 179S. (Gr., "fungus -f eating.") 



Two species are known from the eastern United States, both of 

 which prol)ab]y occur in Indiana, though but one has as yet been 

 taken. The head and thorax are not horned in either sex, 



KEY TO SPECIES OF UOI-ETOPHAGUS. 



«. Thoracic disk with numerous tubercles; the margin strongly cTenulate 



and deeply notched in front of hind angles. 2.'>47. coeticola. 



u(j. Disk of thorax coarsely i>unctured, not tuberculate; sides regularly 



rounded, not crenulate. depressus. 



I'.jlT (7.541). BoLETOPiiAors cokticola Say, .Journ. Phil. Acad. Nat. Sci., 

 Y, 1S2G, 2:_!9; ibid. I, 115. 

 Oblong, robust. Black or brownish-black, opaque. Head with sides 

 prominent, the surface granulate. Thorax three times as broad as long, 

 deeply emarginate in front; surface with numerous granules or small tuber- 

 cles. Elytra with rows of widely interrupted elevated lines or elongate 

 tubercles, with smaller ones in the intervals. Length S-8.5 mm. 



Lake County : scarce. May 28. Taken from beneath bark of 

 birch and pine. 



