194 
IOWA ACADEMY OF SCIENCES. 
Female: Vertex nearly twice as long as broad, slightly more than twice;^^ 
as long on the middle as next the eye; light yellowish with fine brownish 
irrorations; a median light line, broadest on tip fading out on the disk, on 
either side of this a curved line extending back from the edge on to the 
disk. Front with the usual dark V under the vertex, remainder of the ver- 
tex and the clypeus light lemon-yellow; lorse and gense slightly, finely 
maculate with brown; pronotum short, fulvous brownish, lateral margins 
long, posterior angles obscure, emarginate; between them traces of longi- 
tudinal light lines; scutellum large, light yellow, tip darker. Elytra light 
with fulvous brown irrorations; apical and costal veinlets dark, terminal 
spots in cells and costal margin whitish-hyaline; tip slightly clouded with 
dark fuscous. 
Male: Smaller and shorter, the vertex is only about one and one-half 
times as long £s broad and the terminal cells are clouded with fuscous. 
Genitalia: Ultimate segment of the female long, rounding behind nar- 
rowly notched in the middle, slightly lobately produced either side of the 
notch; pygofers light yellow, three times as long as width at base. Male 
valve large, roundingly pointed, dark at the base; plates roundingly pointed, 
twice the length of the valve, maculate. 
Larvae: Similar in form to those of acutus but smaller; they 8 re about 
three and one-half millimeters long by one and one-half wide in the middle 
when full-grown. Widest just before the middle, gradually and regularly 
narrowing to an acute point at either end. There is a broad lemon-yellow 
dorsal stripe, narrow, wedge-shaped on the vertex with indefinite margin; 
broad, with definite parallel margins on the thorax, constricted slightly on 
the base and again before the extremity of the abdomen, bordered on either 
side by a dark fuscous marginal stripe, irregular in width, narrow before 
the eyes, meeting under the vertex. Numerous fine white maculations of 
various sizes dot this stripe. 
The larvae are readily distinguished frona those of acutus by 
the absence of red in the dorsal stripe, and from those of fron- 
talis by the much more elongate form. 
The larvae were first observed early in June, when they were 
nearly full grown, and by the third week had disappeared. The 
adults appeared very thickly by the middle of June and contin- 
ued in decreasing numbers until after the middle of July. The 
second brood of larvae appeared by the last of July and con- 
tinued in large numbers up to the middle of August. The 
second brood of adults appeared the second week in August, con- 
tinuing through September. 
This is the smallest known species of the genus, and the most 
abundant at Ames, occurring everywhere that wild grasses are 
found. Specimens have also been received from Kansas, 
Nebraska and Arizona, showing it to have a wide distribution 
throughout the prairie and plain region at least. 
By a process of elimination of grasses not occurring in places 
where the larvae were found abundantly its list of host plants 
