202 IOWA ACADEMY OF SCIENCES. 



round spots; posterior femora with a long dark line; middle femora with a 

 transverse band below. These at rest complete the ventral stripe across 

 the thorax 



This exceptionally well marked form may be easily recog- 

 nized by its clear white ground color. It has been collected at 

 Ames for several years but has not been received from any 

 other locality. 



The larva3 were first taken May 26th. They were then nearly 

 full-grown and remained abundant for two weeks, disappearing 

 by the middle of June. The adults were taken the 3d of June, 

 and by the middle were exceedingly abundant, continuing in 

 decreasing numbers up to the middle of July. The only appear- 

 ance of a second brood was the capture of an adult male August 

 18th. 



The field where this species occurred had been closely mowed 

 June 25th, and the inference is that eggs had all been deposited 

 in the grass stems above the point of cutting and must have 

 been almost totally destroyed by the mowing. Prom these 

 facts and through comparison with the life-history of other 

 species their life- history may be, with reasonable certainty, 

 completed as follows: Second brood of larvse from the second 

 week in July on to the middle of August; adults through 

 August and September. 



No definite food habit can be assigned, as there was a rich 

 variety of native grasses where it occurred so abundantly. It 

 was not, however, found on a field of Andropogon 8coparius nor 

 where the Bouteloas predominated. Insectary tests to ascertain 

 its food plant failed because of its great susceptibility to Sporo- 

 trichuin in confinement. 



DELTOCEPHALUS INFLATUS N. SP. 

 (PI. xxli, Fig. 2.) 



Form intermediate between that of albidus and comfiguratus. 

 Color very similar to covflguratus usually a dark blotch in the 

 third apical cell. Length, 4.25 to 4.75 mm. Width across cen- 

 ter of cost 98, 1.75 mm. 



Vertex scarcely twice as long on middle as next the eyes, one and one- 

 fourth times as long as broad. Front more than twice as wide at ocelli as 

 at clypeus; facial angle acute, as in albidus; front less inflated. Pronotum 

 short, weakly angled; elytra flaring, variable in length, usually exceeding 

 the abdomen, venation similar to albidus, costal veinlets not as strongly 

 reflexed, shorter. 



Color, dirty yellowish-white to light fuscous with faint markings, tip of 

 vertex ivory white, narrowly, interruptedly margined with dark, a line just 



