IOWA ACADEMY OF SCIENCES. 223 



remaining through June and the greater part of July. Full- 

 grown larvaa were found toward the latter part of July and 

 again before the middle of September; adults common through- 

 out the season. This would indicate three broods during the 

 season, the third one hibernating as adults, though tho larvae 

 iLUDd in July may have been belated ones of the first brood. 



The food plant is Andropog(yn scoparius, and it was not until 

 late in the season that the larvso of D. oculafus, Athysanushicolor 

 and the smaller light ones of obtutus could be distinguished. 

 Many confusing records interfere with the accurate determina- 

 tion of the later broods. 



ATHYSANUS COMMA VAN D. 

 Canadian Entomologist, XXIV, 114, 1892. 



This species was described from Iowa and has been received 

 from Colorado. The adults are five millimeters long by nearly 

 two broad, with a short flat vertex, color creamy white with 

 four square spots on margin of vertex, two round ones near its 

 base, four stripes on the pronotum, the claval suture black. A 

 broad stripe within and parallel to the costal margin, reaching 

 and covering the apical veinlets, curving back to meet a black 

 stripe on the disk, cinnamon brown. 



Larvae have been referred to this species only with some 

 doubt, a^nd will not be described. 



Adults were taken from Ma.y 27th until July 9th, most abun- 

 d i:iitlj about the third week in June. They were again taken 

 in August, however, not so abundantly. The sprirg brood 

 was taken from Elyraus canadensis, but no fall brood could be 

 found on this plant, those taken in August being taken from 

 Elymus striatus. On August 11th three partly grown larvas 

 resembling the adult except that they had only three stripes 

 instead of four, were beaten from the heads of Elymus canadensis. 

 This species is strictly confined to the Elymus as a host plant, 

 but might damage other grasses near where it was abundant. 

 Cutting the Elymus the first of July would destroy the eggs for 

 the second brood. 



ATHYSANUS COLON N SP. 

 (PI. xxvi, Fig. 3.) 



Form and general appearance nearly as in comma, clear, , 

 creamy white with dark stripe, cccurs in two wing lengths. 

 Length of female, 5 mm.; male, 4.25 mm. Width on costa, 

 2.25 mm. 



