35 
eel since the above was written, I learn that Mr. Webster 
this larva at Normal on the 29th of May. 
ie of the specimens obtained by Mr. Webster, were described 
t\ Riley under the name of Isosoma grandis in the Bulletin of 
rooklyn Entomological Society for December 1884, pages 111 
12, with the remark that they were reared from wheat stems 
DESCRIPTION. 
I ‘ following description is in part compiled from that of Mr. 
and in part drawn from specimens bred and collected by us. 
lgth of body from 4.2 to 4.8 mm.; expanse 7.6 mm.; antennae 
?r, little clavate, but about half the length of the thorax, the 
smooth except the mesonotum, which is decidedly rugulose. 
3 large, yellowish in color, less hyaline than those of Isosoma 
the veins reaching the outer third, the sub-marginal four 
as long as the marginal. All the specimens observed were 
d females. Abdomen equal to or longer than the thorax, some- 
stouter than in Isosoma tritici, ovate-acuminate in form. The 
is tawny, with a narrow black shade down the middle, and 
er beneath the eye, the posterior surface black. The scape of 
ntennae and first joint of flagellum yellow, the remainder black, 
oronotum is large, and a brighter yellow than that of tritici. 
are two tawny spots upon the back, and the propectus is yel- 
i front. There is also a large tawny spot upon the pleura, 
the middle coxae. The abdomen is shining black throughout, 
*>t the tips of the anal appendages, which are yellow), and is 
(sparsely covered with pale hair averaging about one-half the 
l of the segments to which they are attached. The tarsi are 
A as are also the anterior tibiae in front and within, the other 
being tawny and more or less shaded with dusky. The 
or coxae are yellow in front, the posterior yellow externally, 
emora have each a definitely limited suboval yellowish spot 
!, near the tip, extending two-fifths the length of the femur on 
ont pair, smaller on middle pair, and shorter and less definite 
0 posterior. 
m Isosoma tritici, to which this species is most nearly allied, 
y be distinguished by its larger size and especially by the far 
r amount of tawny and yellow colors. The larva is about 6 
in length, of a greenish yellow color, distinguished from that 
id only by its larger size. 
pupa, from 4.5 to 5 mm. long, varies in color from white 
j earlier stages, to the colors of the adult when prepared to 
e. It is distinguished from that of tritici by its larger size 
1 1 all our specimens by the presence of wing pads folded around 
)sterior legs. 
u 
LIFE HISTORY AND DISTRIBUTION. 
lough this species has been observed over so short a period, 
cts specified are such as strongly to indicate that it is single- 
u 
