192 
IOWA ACADEMY OP SCIENCES. 
cells; two cross nervures and a series of cross veinlets along 
the hyaline costa always present. 
The genitalia seem to be very constant and very similar in 
the different species and are consequently of little value as 
specific characters. The last ventral segment in the female is 
long, obtusely angled or rounding posteriorly. The last seg- 
ment in the male is angularly excavated; valve large, round- 
ingly pointed. Tne plates are broad and also convexly pointed, 
similar in shape to the valve and about twice its length. 
The three species occurring at Ames agree in being two- 
brooded, the broods occurring at about the same time, the 
adults appearing in June and again in August, remaining less 
than two months each time. The larvoe, of the three species at 
least, agree in being broadest at the middle, pointed at both 
ends, light, with dark margins extending in front of the eyes 
and meeting under the vertex. 
PLATYMETOPIUS ACUTUS SAY. 
Jassus acutus, Say, Jour, Acad. Nat. Sci. Phila., VI, p. 336, 1831; Compl. Writings, II, 
p. 38?, 1869. 
Platymetopius acutus, Uhler, Bull. U. S. Geol. and Geog. Surv., Ill, p. 473, 1877. 
This widely distributed form may be recognized by its remark- 
ably, acutely, pointed vertex and narrow elongate face, together 
with a row of black marked cross nervures along the costal 
border and the finely irrorate elytra. Length, 5 mm. 
The larvae resemble the adults in having the head elongate, 
narrower than the pronotum. When full-grown they are about 
four and one-half millimeters long by two millimeters broad 
in the middle where they are the widest, and from which they 
gradually and about equally, narrow to an acute point at either 
end. 
Color: There is a broad dorsal light stripe including all the 
vertex, parallel margined across the thora<x where it is slightly 
wider than between the eyes, constricted on the base of the 
abdomen and again before the tip expanding on the disk of the 
abdomen, and again on the extreme tip. This stripe is dis- 
tinctly red on the center, shading out to creamy white on the 
margin. The constrictions on the abdomen sometimes com- 
pletely dividing it into two spots, one on the disk and another 
on the tip. A marginal black strips extending the entire length 
of the body on either side, m_eetmg entirely below the edge of 
the vertex in front, including numerous fine white maculations. 
Below, inside the marginal stripe, creamy white. 
