210 
IOWA ACADEMY OP SCIENCES. 
through August, larvso again appearing sometime in Septem- 
ber, goiug through the winter to appear again as adults in May. 
Facts which materially strengthen these conclusions are that 
while in these two species exterminated, known facts in their 
life-history indicate that the eggs would have been deposited 
before this time, and would thus be subject to destruction, 
while other species occurring on the same area, whose eggs are 
known to be deposited at other periods, remained abundant 
throughout the season. That close mowing at the proper time 
was an effectual check seemed to be thoroughly demonstrated 
for these two species. There would be a second period, when 
the eggs of the second brood might be destroyed, occurring, 
according to the above determinations, toward the last of 
August. 
DELTOCEPHALUS DEBILIS UHL. 
(Plate xxiii, Fig. 2.) 
Deltoceplialus debilis Uhler. Bull., U. S. Geol. and Geog. Surv., II, p. 360, 1876. 
Deltocephalus minki Pall. Provancher. Pet. Faun., Ill, p.279, 1889. 
Although this is a very variable species in color, size and 
genital characters, and approaches in its different variations 
three recognized European species, abdominalis, Fab., falleni 
Fab., minJci Fieb., the intergradation of these varieties pre- 
vents their separation, for this country at least. An examina- 
tion of the European material at hand indicates a similar 
variation in their fauna. 
This species may be briefly characterized as follows: 
Color, usually deep green, more or less marked with black below, some- 
times even appearing on the elytra. Vertex Viiriable, more or less dis- 
tinctly, acutely angled; length usually slightly greater than width; front 
strong, broad above; sides straight; lorac long; genae with the lateral mar- 
gins excavated below the eyes; outer angle very distinct, scarcely rounding 
below the clypeus; elytra, length variable, usually exceeding abdomen; 
venation distinct, central anteapical cell large, first anteapical narrow, elon- 
gate, nearly parallel margined. 
Genitadia: Ultimate ventral segment of female varying from rounding 
behind with a deep notch to nearly truncate, slightly lobed each side of a 
shallow notch. Male valve obtuse, variably exposed; plates very broad at 
base, slightly longer than wide, bluntly, obtusely pointed, lined or spotted 
with black; length, 4 mm. 
This well known species is comparatively rare at Ames, a 
few specimens being taken each year. During this season 
adults were taken from the first week in June until the first 
week in July, usually found in wooded regions. 
