THE DARKLING BEETLES. 



1261 



2329 ( T-IOC.). DIAPERIS MACULATA Oliv., Eucyc. Meth., VI, 1791, 27:!. 



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 sutnral line not reaching 

 scntelluni and wider on apical halt', a rounded 

 spot on middle of basal third and another 

 elongate and smaller one near the margin, a 

 large irregular spnt on apical half reaching / 

 from margin nearly to sutnral line. Thorax 

 nearly three times as wide as long, finely and 



Fig 564 a, larva; b, beetle; c, under 

 sparsely punctate. Elytra With rows OI rather si d e of head of larva; d, leg of same; e, an- 



tine, feebly impressed pnnctum ; intervals tma of beetle. (After Kik-y 

 flat, minutely and sparsely punctulate. Length 6-6.5 mm. (Fig. 5C>4. ) 



Throughout the State; common and gregarious beneath bark, 

 especially that of elm, and in fungi. March 16-September 0. 



XVIII. ARRHENOPLITA Kii'by. 1S.V7. (Gr., "strong + weapon.") 



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

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

 short horns on clypeus and two longer ones on vertex. Two of the 

 three recognized species occur in the State. Formerly listed under 

 Hoplocephala. 



2330 (7508). ARRHENOPLITA VIRIDIPENNIS Fab., Syst. Eleut, II, 1801, 586. 



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

 red ; head, abdomen and apical half of antemue piceous; elytra green or 

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

 feebly curved, hind angles rounded, surface finely and rather sparsely punc- 

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

 late. Length 3-3.5 mm. 



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

 fungus covered log. Probably throughout the southern third of 

 State. 



*2331 (7509). ARRHENOPLITA BICORNIS Oliv., Ent., Ill, 1795, 55. 



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

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

 sternum, usually piceous. Elytral stri.-e more coarsely punctate. Length 

 3 t mm. 



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

 Hibernates. February 25-October 1 1. The head of female in both 

 species is wholly devoid of horns or tubercles. 



