TI-IE DEATH-'SVATCH AND DKUG STOKE BEETLES. 873 



long as wide, sides parallel, broadly sinuate at middle; hind angles nearly 

 rectangular, sharijly defined ; disk evenly convex, with an impressed line at 

 middle and a transverse impression each side on basal third. Elytra with 

 regular rows of close-set, rather deep, quadrate punctures ; intervals slightly 

 convex, not much wider than the punctures. Length 5-6.2 mm. 



Starke, Putnam, Vigo and Lawrem-e counties; scarce. June 

 12-October 12. Occurs beneath bark and on old branches of wild 

 cherry and oak. 



Tribe IV. XYLETINIXI. 



Usually elongate-oval species having the contractile power fairly 

 well developed; thorax excavated beneath for the head, which is 

 strongly bent iinder in repose, and more or less impressed or exca- 

 vated on the under side, the antennae curving into the cavities and 

 resting against the front eoxse. The antenn;e are 11-jointed and 

 variable in form. Two of the six genera comprising the tribe are 

 represented in Indiana, while another may occur. 



KEY TO INDIANA GENEEA OF XYI.ETIN1^;I. 



0. Elytra striate; head merely broadly impressed beneath in front, not dis- 

 tinctly excavated for tlic reception of the antennae, the latter strongly 

 serrate, the three outer joints not elongate ; metasternum not sloping 

 downward in front. X. Xyletinus. 



(1(1. Elytra not striate; head deeply excavated beneath for the antennae. 

 0. Antennae serrate, the outer joints not elongate ; metasternum strongly 

 sloping downward in front. XI. Lasioderma. 



B6. Antennfe not serrate, joints 9-lt elongate; metasternum more grad- 

 ually sloping downward. Megokama. 



X. Xyletini's Lat. 1829. (Gr., "wood -i- destroy. ") 



Oval to oblong species, having the thorax wider than long, the 

 hind angles broadly rounded and undefined, the front angles nearly 

 rectangular and scarcely rounded; elytra striate, the outer and 

 inner striae uniting on apical third ; ^'entral sesraents nearly equal, 

 the first, second and fifth somewhat longer than the third and 

 fourth. Three of tlie nine known species have been taken in In- 

 fiinna. 



KEY TO INDIANA SI'1':( lES OF XYI.ETINrs. 



i(. Form cylindrical ; eyes, especially those of male, larger and more con- 

 vex ; width of front about twice as wide as that of eye when viewed 

 from the front ; color brown or reddish-brown, 

 b. Last joint of maxillary palpiis elongate, feebly triangular; thorax 

 more parallel, the side margins very narrow and not at all reflexed. 



1660. PELT.VTUS. 



