THE LEAF BEETLES. 1159 



2147 (6821). CHKYSOMELA AURIPKNNIS Say, Journ. Phil. Acad. Nat. Sci., 



Ill, 1824. 452 ; ibid. II, 218. 



Oblong-oval. Head, thorax, scutellum and under surface dark vio- 

 laceous blue; elytra coppery red or brassy green, strongly shining. Thorax 

 twice as wide as long, finely and sparsely punctate. Elytra with somewhat 

 regular rows of distant, rather coarse but not impressed punctures. Length 

 8-11 mm. 



Lake County; scarce. April 15-August 24. Occurs in the sand 

 dune region, usually about the prickly-pear cactus. Linell gives its 

 range as Texas to Nebraska, 



2148 (0824). CHRYSOMELA SUBOPACA llogers, Proc. Phil. Acad. Nat. Sci., 



VIII, 1856, 36. 



Oblong-oval. Uniform purplish-black, feebly bronzed, subopaque and 

 above finely alutaceous. Thorax nearly twice as wide as long, disk finely 

 and sparsely punctate, and with a few coarse punctures along the inner side 

 of the thickened margin. Elytra with irregular rows of rather fine, scarcely 

 impressed punctures. Length 7-9 mm. 



Vigo and Crawford counties; rare. June 28-November 9. Oc- 

 curs from New York to Texas. 



Plagiodera riridis Melsh., greenish to fuscous or brassy, shining, 

 length 3 mm., was de -scribed from Pennsylvania. 



XXXIX. GASTROIDEA Hope. 1840. (dr., " belly + form," i. e., 



pot-bellied. ) 



Small, oblong-greenish forms having the punctures of elytra 

 dense and confused and the sides of thorax not thickened. The 

 females have the abdomen very much swollen before their eggs are 

 laid, making it difficult for them to move about. 



2149 (6830). GASTROIDEA POLYGON: Linn.. Syst. Nat., ed. 10. IT'.S. 370. 

 Oblong-oval. Head, elytra and under surface brilliant * 



green or blue; thorax, legs, base of antennas and tip of ab- 

 domen reddish; tarsi and apical two-thirds of antennas black. 

 Thorax twice as broad as long, sides rounded, surface finely 

 and sparsely punctate. Length 4-5 mm. (Fig. 503.) 



Southern half of State, frequent ; probably 

 throughout. April 29 October 6. Occurs on the knot- 

 grass, Polygonum aviciilarc L. in yards and along 



Fig. 503. 

 pathways. (After Harris.) 



2150 (6832). GASTROIDEA CYANEA Melsh., Proc. Phil. Acad. Nat. Sci.. III. 



1S47, 175. 



Oblong-oval. Uniform brilliant green or blue; antenna?, legs and under 

 surface purplish-black. Head and thorax finely and sparsely punctate; ely- 

 tra densely and rather roughly punctate. Length 4-5 mm. 



