34 



ground for another seeding-. To these must ])e added the mowing off 

 of roadsides and along fences and margins of fields during late June 

 or early Jul}', or the ])urning over of these during winter or early 

 spring, thus destroying the hibernating larvae. The rye grass along 

 the margins of lields and ditches should n^ceive special attention in the 

 matter of mowing and l)urning. It is not known whether or not any- 

 thing is to be gained })y early sowing, which, besides, is apt to invite 

 the attack of Hessian fly. 



THE CAPTIVE ISOSOMA. 



{Isosoma captivum Howard. Fig. 11.) 



Ver}' little is known of the habits and transformations of this species. 

 I found it in a field of growing rye near Normal, 111., May 10, 1884, 

 and swept it from timothy and bluegrass about Lafa3'ette, Ind., during 

 May, 1885, and again during the same month in 1886. Dr. J. A. 

 Lintner reared both sexes from wheat straw sent him from Johnsons 

 Creek, Niagara County, N. Y., in December, 1887, the adults appear- 



Fk;. \\.— Ts()i>n7nn cnptivinnTlnyx.: arlnlt (from HnwarrD. 



ing in March of the following year, the straw haviiig, presumably, 

 been kept indoors during the winter." Probably the adults occur 

 normally at about the same time as those of Iwsoina hordel., tritici^ 

 and elyvii. We know that it attacks wheat, probabl}^ rye, and perhaps 

 barley. 



DESCRIPTION. 



''Female.— Length., 3.4 mm.; expanse, 5.8 mm. Head and mesonotum uniformly, 

 finely, and closely rugulose, not shagreened; metanotum more coarsely rugulose and 

 with a narrow and shallow central longitudinal groove, which widens slightly pos- 

 teriorly; pronotal spot plain, moderately large; hind coxae delicately punctate. 



« Fourth Report, State Entomologist of New York, p. 34. 



