165 



was roportod from Florida that fivo per conl. of the sugar-cano sproiats 

 wore infested by them, and in Michigan they have been charged with 

 an ext<jnsive injury U) onioiiK, inchjding the destruction of two thousand 

 acres of this r-rop. Hushes and wild grasses arc also infest<-;d by them. 



b 



Fio. 15:{. The Htalk-rriftKKOt, CfunUipids renen: a, larva; h, pupariurn; 

 c, a/Jult. 10rilar«e'l aw indicate'!. CRiley and Howard, (/. H. Dept. of 

 AgriciiltMrej 



We have bred the flies from larva; in a large-sU:;rnrned grass and in the 

 common raad, Phragrn/UeH communtH. 



The species is common throughout the UniUjd States east of the 

 Ilocky Mountains, and ranges from Canada to Cuba. 



The slender, prnnted eggs are insert<;d singly or in groups of two to 

 five jast beneath the leaf-sheath. The mature larva changes tr> a yel- 

 lowish or brownish puparium (Fig. 153, h), from which, in due time, 

 emerges a handsome, bright metallic-green fly (Fig. 153, c) about a fifth 

 of an inch long, the transparent wings crossed by three blackish bars. 

 Larvaj found in infested onions in Michigan in (Jctober wintered over 

 and emerged the following spring. In Illinois the adults are common 

 in May and the larvai in late June and early July. Very few adults 

 have Ijcen taken in June, but they are again common in July. This is 

 probably the second brood, as Garman suggests. Larva? taken by us 

 in Sept<jmber and early October yielded adults, V^y breeding, in late 

 Sept(3mber and Octcjber. None were taken in August, but they are 

 again recorfled in our not<;s as common in decaying tissue of com Novem- 

 ber f). Tfiere are tfie-reffjre at least three broods, and possibly four. 



Cki'vATO-vivza ixjksalis Loew. 



(Odontorera dorsalis.) 



This leaf-mining maggot has been twice reared to tlie adult. The 

 egg is insert(;d near the tip of the com leaf, vvPience the larva burrows 

 downward in a sinuous path (Fig. 155j, eating away the green inner 



