THE LEAF BEETLES. 



1 189 



2194 (10,416). Disonycha crenicollis Say, Bost. Journ. Nat. Hist.. I, 1835, 



200; ibid. II. 668. 



Very similar to caroliniana. Head with occiput usually in pari pic- 

 eous; thorax reddish-yellow with three piceous spots, arranged in a tri- 

 angle, the front pair larger; elytra as in caroliniana, the median black 

 stripe as wide or wider than the yellow one each side, the sutural and mar- 

 ginal ones joining at tip. Thorax not more than twice as wide as long, its 

 surface, as well as that of elytra, more distinctly alutaceous and more evi- 

 dently punctate than in caroliniana. Length 5-6 mm. 



Vigo County; scarce. February 21-March 18. Hibernates be- 

 neath partly buried logs in open woods. 



2195 (0951). Disonycha glabrata Fabr.. Spec. Ins., I, 1781, 150. 

 Oblong-oval, surface very shining, as if varnished. 



Head often entirely black except the front, sometimes 

 nearly wholly yellow; thorax yellow, usually with a 

 narrow median spot, sometimes an indistinct spot each 

 side; elytra yellow, the suture, margins and a median 

 stripe black: under surface and legs usually yellow, 

 tips of tibiae and. tarsi, and sometimes the hind por- 

 tion of metasternum, piceous. Thorax more than twice 

 as wide as long, margins narrow, surface smooth, shin- 

 ing. Elytra a little, wider at base than thorax, very 

 finely and sparsely punctate. Length 5-5.5 mm. (Fig. 

 522.) (Original.) 



Throughout the State, common ; more so in the southern coun- 

 ties. April 6— July 8. Taken by sweeping roadside herbage, espe- 

 cially the pigweed, Amafantus rctroflexus L. Resembles pennsyl- 

 ranica, but smaller and more shining. The black median stripe of 

 each elytron is distinctly wider than the yellow ones each side. 



2196 (0954). Disonycha abbreviata Melsh., Proc. Phil. Acad. Nat. Sci.. 



Ill, 1847, 103. 



Oval, slightly oblong. Head, thorax, scutelluin, under surface and 

 femora, reddish-yellow ; elytra paler yellow with a sutural stripe and a 

 median one on each, both rather wide, black; antennas piceous, the two 

 basal joints and the apical one paler ; tibiae and tarsi yellow, with a black 

 line on outer side. Thorax nearly twice as wide as long, narrowed in 

 front, sides curved, margins narrow, surface smooth. Elytra slightly wider 

 at base than thorax, umbone distinct, surface finely alutaceous. very finely 

 and sparsely punctate. Length 0-8.5 mm. 



Southern half of State; scarce. April 9-September 29. Prob- 

 able hibernates, as most of the specimens were taken beneath logs in 

 the spring. 



2197 (0955). Disonycha discoidea Fab., Syst. Ent., II, 1798, 25. 



Oval, slightly depressed. Reddish-yellow; antenna?, tibia? and tarsi 

 piceous; elytra with a broad oval sutural spot black, shining. Thorax 



