THE LAMELLrCOKN BEETLES. 



991 



21. Often altracted in large numbers to electric light; evidently 

 pupates in moist places, as a number were thrown up in plowing a 

 recently drained marsh. Listed under Ghalepus, which name was 

 preoccupied. 



XXXI. LiGYRUS Burm. 1847. (Gr., "flexible.") 



This genus and the next are composed of moderate-sized, robust 

 convex species, having the head armed with small tranverse toothed 

 ridges, alike in both sexes ; clypeus rather ^triangular, always 

 toothed ; first joint of hind tarsi more or less elevated at its upper 

 end. In Ligyrus there are small stridulating organs or rugose 

 spaces on the inner surface of the elytra near the outer hind mar- 

 gin. Two of the four known species have been taken in the State, 

 and a third probably occurs. 



KEY TO INDIANA SPECIES OF LIGYEUS. 



a. Thorax Impressed in front and with a small tubercle on the front niur- 



gin ; front tibisE with three teeth. 



6. Clypeus with two teeth. 1851. gibboscs. 



66. Clypeus with one tooth at middle. ruginasus. 



00. Thorax not impressed nor t'uberculate ; front tibiaj with four teeth, the 



upper O'Ue small ; mesothorax hairy. 1S52. eelictus. 



1851 (5869). LiGYEFS gibbosus DeG., Mem. Hist, des Ins., IV, 1768, 322. 

 Oblong-robust, slightly broader 



behind. Reddish-brown to darli chest- ^ __ __ ^ 



nut-brown above, paler beneath. Tho- 

 rax one-half wider than long, strong- 

 ly convex, sides regularly curved 

 from base to apex ; surface rather 

 finely, sparsely and unevenly punc- 

 tate. Elytral punctures much coars- 

 er than those of thorax, those on 

 disk in somewhat regular rows; 

 those on sides confused. Length 11- 

 10 mm. (Fig. 409.) 



Throughout the State; com- 

 mon. April 18-September 27. 

 Sometimes very abundant at 

 electric lights. 



L. rw/y'""'*"-' Lee., reddish- 

 brown, li'ngth 16.5 mm., is a 

 southern species which has been recorded from near Cincinnati. 



|-f!3-^U.>102] 



Fig. 409. X 2i. fAftor Forbes.) 



