THE GRAIN AND BARK-GNAWING BEETLES. 



663 



I. Alindria Erichs. 1844. (Or., "to roll or turn.") 



This genus is represented in the eastern United States by two 

 species, one of which occurs in Indiana. 



1270 (3831). Alindkia cylindeica Geoff., Encyc. Method., X, 719. 



Elongate, subcylindrical, convex. Uniform dark reddish-brown or pic- 

 eous. Thorax subquadrate, slightly and gradually narrowed from apex to 

 base, hind angles obtuse, surface finely, sparsely and evenly punctate. Ely- 

 tra with base well separated from that of thorax, sides nearly parallel, tips 

 rounded; surface striate, the stria? with rather fine serrate punctures; in- 

 tervals very finely punctulate. Length 5-14 mm. 



Southern half of State; frequent. April 14-September 20. 

 Occurs beneath bark of hickory, elm, etc. There is a wide varia- 

 tion in size between the sexes, the males being much the smaller. 



Trogosita virescens Fab., greenish- 

 black, 12 mm. in length, occurs beneath 

 bark of pine, etc., and has been taken at 

 Cincinnati. 



II. Tenebroides Pillar & Mett. 1783. 

 (Gt., ' ' Tenebrio + resemble. ") 



Oblong, subdepressed species having the 

 thorax widely emarginate at apex, nar- 

 rowed behind the middle and somewhat 

 distant from elytra; front of head tri sinu- 

 ate or emarginate in front; tibise without 

 spines. Twelve species and a number of 

 varieties are listed from the United States. 



.-, f> n • i i ,n Kg. 246. T. mauriianka L. Adul t 



Ol these the lOilOWmg have been taken Or beetle with antenna, the latter greatlv 

 , . T n . enlarged. Bull. 4, U. S. Div. Ent. 



perhaps occur m Indiana : (After Howard.) 



KEY TO INDIANA SPECIES OF TENEBROIDES. 



a. Eighth joint of antennae equal to the ninth ; length 9.5 mm. (Fig. 246.) 



MAURITANIA. 



aa. Eighth joint much smaller than the ninth. 



&. Thorax subquadrate, but little broader than long, sides feebly 

 rounded, hind angles acute, 

 c. Color black or piceous ; sides of thorax sinuate near base ; form 

 more convex. 



d. Size larger, 7.5-8 mm. ; sides of thorax more rounded than in 

 the next. 1271. corticalis. 



dd. Size smaller, not over 6.5 mm. ; sides of thorax feebly rounded. 



1272. DUBIA. 



cc. Color reddish or chestnut brown ; sides of thorax not sinuate ; form 

 more depressed. 1273. nana. 



