THE DARKLING BEETLES. 



1261 



2329 (7506). Diaperis maculata Oliv., Encyc. Meth., VI, 1791, 273. 



Broadly oval, convex. Black; head be- 

 tween the eyes and elytra, in great part, 

 orange-red; the latter being marked with 

 black as follows: a sutural line not reaching 

 scntellnm and wider on apical half, a rounded 

 spot on middle of basal third and another 

 elongate and smaller one near the margin, a 

 large irregnlar spot on apical half reaching 

 from margin nearly to sutural line. Thorax 

 nearly three times as wide as long, finely and 

 sparsely punctate. Elytra with rows of rather 

 fine, feebly impressed punctures; intervals 

 flat, minutely and sparsely punctulate. Length 6-6.5 mm. ( Fig. 564.) 



Throughout the State; common and gregarious beneath bark, 

 especially that of elm, and in fungi. March 16-Sept ember 9. 



Fig 564. o, larva; b, beetle; c, under 

 side of head of larva; d,-leg of same; e, an- 

 tenna of beetle. (After Riley.) 



XVIII. Arm.knopi.ita Kirby. 1837. (Gr., "strong + weapon. ) 



Small elongate-oval, bluish or greenish species, having the epi- 

 pleurae abbreviated and the males (in our species) armed with two 

 short horns on elypeus and two longer ones on vertex. Two ot the 

 three recognized, species occur in the State. Formerly listed under 

 Hoplocephala. 



2330 (T50S) Akrhknofijta yibidipennis Fab., Syst. Eleut., II, 1801, 5S6. 



Elongate-oval. Thorax, legs and under surface, except abdomen, orange- 

 red- head abdomen and apical half of antenna* piceous; elytra green or 

 blue with metallic lustre. Thorax nearly three times as wide as long, sides 

 Lbir curved, hind angles rounded, surface finely and ratter sparsely punc- 

 tate Elytra finely striate-punctate ; intervals nearly flat, minutely puuctu- 

 late. Length 3-3.5 mm. 



Posey County; scarce. April 13. Taken from beneath bark of 



fungus covered log. Probably throughout the southern third ot 



State. 



*->331 (7509). Arrhenoplita bicorhiS Oliv.. Ent., III. 1795. 55. 



Differs from the preceding in having the whole upper surface bluish- 

 green the thorax sometimes varying to brownish ; under surface, except pro- 

 ^ernun, usually piceous. Eiytral strhe more coarsely punctate. Length 

 3-4: mm. 



Throughout the State ; very common on fungi of various kinds. 

 Hibernate! February 25-October 11. The head of female m both 

 species is wholly devoid of horns or tubercles. 



