117 



(luys I)c<;;i)i laying (!ggs, wliicli liaU-hed witliin a ftjrtiiight. liy the 

 middle of .Iiiiic the lialf-grovvii young Ix'gaii 1o ovf-rsprcad the fields and 

 to injuH! cultivated plants. Jiy July 10 the adults were developed, 

 and the bugs began to gather on the wheat. About August 1, eggs were 

 laid for a second brood, principally on Russian thistle, wheat, and corn- 

 stalks, the thistles being sometimes fairly white with eggs. Adults of 

 this generation commonly hibcirnate. 



THYANTA PEllDITOR Fabk. 



This small green "stink-bug," not known to occur in Illinois, is 

 reported by Sanderson* to have, a|)peare(l in extraordinary numbers in 

 noi-thern Texas in 1903, seriously damaging 

 r)ats, corn, and sorghum. It is common in 

 central and northern Texas, where it injures 

 various croi)S, in(;luding rnilo-maize and cow- 

 [)eas, in a manner similar to that of Pentn- 

 lorrid uhleri. 



It is of the usual oval-triangular form 

 of these insects (Fig. 102), a half inch or less 

 in length, the shoulder angles s})iny, and not, 

 rounded as are those of our common Illinois 

 species, 7'. ra.s/c/<or, which it otherwise greatly 

 resernbl(!S. It is found from ('olorado and 

 Nebraska southward, through Texas, Ari- 

 zona, and Mexico, to Venezuela and the 



l*'li;. 102. Tliyaiild pcrditor. 

 West Indies. Three firneH luitural size. 



Tin: FALSF CHINCH-BU(1. 



Nysius angustatus I J hi. 



Although occasionally mistaken for the chinch-bug, this insect is 

 readily distinguishabh^ from it by one who knows the latter species. 

 It is a nearly uniform light gray (Fig. 108; PI. VIII., Fig. 1), while 

 the chinch-bug is black, with milky white wing-covers except for a 

 pair of black spots on the sides f)f the latter, giving the effect of 

 a white X-mark on the back. The false chinch-bug at times does a 

 (considerable injury to crops similar to that of the chinch-bug proper. 

 Th(! adults are light gray si)eckled with blackish, the young similar 

 in g(!neral color but streaked lengthwise with fine dark lines (Fig. 

 104,/;). They injure plants by sucking the saj) from small punctures, 

 thus causing rusty spe(-ks (Fig. 104, a), due to a deadening of the 

 tissues drained. We have found them several times in small numbers 



♦Bull. U. S. Dept. Akf., Div. Ent., N. S., No. 40, p. 94. 



