IOWA ACADEMY OF SCIENCES. 
223 
remaining through June and the greater part of July. Full- 
grown larv 80 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 the larv^ 
found in July may have been belated ones of the first brood. 
The food plant is Andropogon scopariics, and it was not until 
late in the season that the larvae of D. oculatus, Athysanus Mcolor 
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. 
Larvse have been referred to this species only with some 
doubt, and will not be described. 
Adults were taken from May 27th until July 9th, most abun- 
dantly about the third week in June. They were again taken 
in August, however, not so abundantly. The spring brood 
was taken from Elymus 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 larvae 
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. 
(PL xxvi, Pig. 3.) 
Form and general appearance nearly as in comma, clear, 
creamy white with dark stripe, occurs in two wing lengths. 
Length of female, 5 mm.; male, 4.25 mm. Width on costa, 
2.25 mm. 
