206 
IOWA ACADEMY OF SCIENCES. 
did not occur. They were then nearly grown, and the adults 
were beginning to appear. Two weeks later the adults were 
abundant and the larvae gone. The adults continued abundant 
until into September, and could be found to the end of the 
season. 
This species was taken wherever B. Mrsuta was found, and 
never anywhere else during the season. B. curtipendula how- 
ever usually occurs with Mrsuta so that it could not be excluded 
on that ground, but the latter also occurs where Mrsuta does 
not, and in no such locations has this species been taken as yet. 
Within the limits of the area it appears to feed indifferently on 
either plant, so that if restricted to the one it is probably a 
restriction of egg deposition. 
DELTOCEPHALUS ABBREVIATES N. SP. 
(Plate xxii, Pig. 4.) 
Form of pectinatus but much smaller. Smaller than melscJiei- 
merl. Light cinereus in color; length, 3 to 3.25 mm.; width, on 
center of costa, 1.25 mm. 
Vertex shorter than in redexus; slightly, roundingly pointed, twice as 
long on the middle as next eye, about half longer than breadth between 
the eyes; front slightly proportionately longer than in re.^exMs, side straight; 
clypeus longer than broad at base; pronotum very short, truncate behind; 
elytra variable in length, without an appendix; veins on clavus not united; 
outer apical cell smaller than anal. 
Color, light cinereus, above; markings as in redexas strong; triangle 
around the white tip complete, broad; oblique line on margin usually 
reduced to a dot midway between the ocelli and tip; transverse band nearly 
complete; slightly crescentiform; oblique spots at base of vertex usually 
strong, sometimes a row of spots near the front margin of the pronotum. 
Elytra light cinereus, nearly all the nervures fuscous margined; apical 
cells and anterior margin of reflexed veinlet broadly black margined; ter- 
gum dark at base, two apical segments creamy white, with a V-shaped 
black margin in the female. Below, front fuscous; clypeus, lore© and genae 
usually light with fusc3us sutures; venter fuscous. 
Genitalia: Ultimate ventral segment of the female twice wider than 
long, slightly emarginate posteriorly; middle fourth produced half its width, 
truncate, notched; arcuated and dark colored each side of the notch. Male, 
last ventral segment very short; valve large, acutely angled, much longer 
than the segment; plates broad, convexly pointed; about twice the length 
of the valve; pygofers elongate, narrow, much exceeding the plate. 
Described from numerous examples. 
Larvae: Resembling those of redexus but much smaller in size. Color, 
olive green to fuscous; dark markings. broken up into quadrate areas with 
fuscous margins. Vertex acutely pointed; body short, broad, abruptly 
terminated; median line narrow, broadening on the abdomen, where it is 
obscure; lateral lines usually complete; a transverse line on the vertex, 
