DELTOCEPHALUS CONFIGURATUS UHL. 81 
Wyoming, and Montana. At Tower City, N. Dak., it was reported 
in 1901 and 1905, evidently occurring in abundance in grasses, as 
collections included large numbers of both males and females. In 
New York it was stated by Van Duzee to be ‘‘a common meadow 
insect from May to August, but in the year 1904 I did not find it in 
any numbers except at Hamburg, although I collected at a number 
of different points in that State. Probably, however, my collections 
were made a little too late in the summer to find it at its greatest 
abundance. In 1909 I found it quite common at Brookings, 8. Dak., 
June 20 and 25, especially in wild grasses, and at Fargo, N. Dak., it 
was the most abundant species for this and the succeeding month 
in an old pasture of brome 
grass. It occurred at the 
Mammoth Hot Springs, Yel- 
lowstone Park, Wyo., July 9, 
on native grasses. 
It is one of the largest 
species of the genus Delto- 
cephalus and is easily recog- 
nized by the broad blunt 
head as well as by the pecul- 
iar structure of the genitalia. 
(See fig. 16.) The last ven- 
tral segment of the female 
ends in a narrow black proc- 
ess divided at the tip, and the 
male plates are large, broad, 
and obliquely truncate. The 
forewings are usually longer 
than the abdomen, but vary 
in length in different indi- 
viduals. 
The nymphs have a broad Iria. 16.—Deltocephalus configuratus: a, Adult; b, face; c, 
i : A vertex and pronotum; d, female genitalia; e, male geni- 
head, the front of which is talia; f, wing; g, nymph. All enlarged. (After Osborn 
rounded and marked with 274 Ball.) 
brownish bars. They are pale brown above, with three indistinct 
stripes and a row of dots just within the narrow light border on 
each side of the abdomen. The full-grown nymphs were first taken in 
Iowa early in May along with adults that had apparently just issued 
fo) 
from the nymphal stage, and within two weeks the nymphs had all 
matured and adults were very abundant throughout June and a few 
occurred in early July. At the time the observations were made 
in 1906 the field in which they were made, and which was under 
observation throughout the whole season, was mowed June 25; the 
only specimens indicating a second generation were some half-grown 
