1172 FAMILY LIII. CHRYSOMELID.E. 



c. Head and legs in part piceous; elytra black. atbepexnis. 

 cg. Head and legs pale : elytra green or yellow. 2170. loxgicobxis. 

 aa. Tibiae not carinate along the outer edge; elytra yellow with black 

 stripes. 2171. yittata. 



2169 ( 0881). Diabrotic a 12-n xctata Pabr., Syst. Ent.. 1775. 103. 

 Oblong-oval, narrower in front, moderately convex. Pale greenish-yel- 

 low : head and presternum black ; elytra each with six black spots, as 

 shown in Fig. 511 : antenna? dark, with three basal joints pale, the second 

 and third together about as long as fourth ; legs except base of femora 

 piceous. Thorax wider than long, surface smooth ; disk convex with a 

 rather deep pit each side of middle. Elytra sparsely and very finely punc- 

 tate. Length 6-7.5 mm. i Fig. 511. ) 



Throughout the State; common. May 30-October 21. Occurs 

 on the foliage of cucumber, melon and allied plants, but is much 

 less injurious to them than is I), vittata: found also on goldenrod, 

 corn and many plants. The larva? feed On the roots of corn and 

 grasses. 



D. atripennis Say, entirely black, or with thorax and abdomen 

 in part or wholly yellow, .length 4-5 nun., is said to occur from 

 Massachusetts to Kansas and Dakota, but no specimens have as yet 

 been noted in Indiana. 



2170 (GSSsj. Diabeotica loxgicorxis Say. Joum. Phil. Acad. Nat. Sci., 



III. 1S24. 400: ibid. II. 223. 



I-Zlongate-oblong. Greenish or 

 greenish-yellow; antennae, and 

 sometimes the head and thorax, 

 pale reddish-brown. Thorax near- 

 ly quadrate, sides curved in 

 front, slightly sinuate b e h i n d : 

 disk convex, smooth, with a rather 

 deep fovea each side. Antennae 

 two-thirds the length of body. 

 Elytra distinctly wider behind 

 the middle, surface vaguely sub- 

 sulcate. rather coarsely and close- 

 ly punctate and with a raised line 

 from umbone two-thirds to apex. 

 Length 5-5.5 mm. (Fig. 512.') 



Thrcnghout the State, fre- 

 euciit : more so in the south- 

 ern counties. June 22— October 5. Most abundant in early autumn 

 on the silk and loaves of ripening corn and on the flowers of wild 

 sunflower and goldenrod. 



Fig. 512. X 19. (AfterTorbes.) 



