182 
IOWA ACADEMY OP SCIENCES. 
Full-grown larv 80 were swept from prairie grass July 6th. 
They are shorter, stouter, with shorter vertex, covered all over 
with stiff white hairs. 
In addition to these a small larva was taken from the base of 
an Elymus stock, September 5th, and another larger one May 
22d. This pupated in cage May 29th and died June 16th. 
These two larv^ are doubtfully referred to this species which, 
if correct, would indicate Elymus as the larval food plant. 
EUACANTHUS ACUMINATES FAB. 
(PL xix, Fig. 3.) 
Cicada acuminata, Fab. Syst. Bnt. IV, 35, 40, 1794. 
Euacanthus orbitalis, Fitch. Homop. N. Y. State Oah., p. 57. 
Fitch’s description of orMtalis and the specimens at hand 
agree in every respect with the description of acuminatus and 
with European examples of the species, so that there seems to 
be no question as to their specific identity. 
This species occurs throughout the whole of central Europe, 
and probably has an equally general distribution in this coun- 
try. It has already been reported from Canada, New York and 
Michigan, and specimens are at hand from Washington, D C., 
and Vancouver’s Island, besides adults and larvae taken at Ames 
this season. 
The adult is very stout-bodied with a broad vertex and small 
round eyes. Length, 6 mm., width on center of costa, 2mm. 
Vertex about equaling pronotum in length; nearly twice 
broader than long, obtusely angled anteriorly, medially and 
laterally carinate; ocelli on the vertex near the carinate anter- 
ior margin, about equally distant from eye and tip; front broad 
above, rounding to the small clypeus; base of the antennae over- 
hung; pronotum short; elytral venation simple, first sector 
only once forked; color, shining black with margin of eyes, tip 
of vertex, elytral nervures and a large spot near the base of the 
costa, white. . 
Genitalia: Ultimate ventral segm.ent of the female long, 
rounding, posterior margin arcuated and slightly notched. 
Male valve obtuse, short; plate long and very narrow, exceed- 
ing the py gofers. 
Larvae white: Head similar in form to the adult, much more 
inflated and produced, one- third the length and nearly half the 
size of the whole insect, four times the length of the bead-like 
eyes, evenly and finely covered with short white hairs; antennae 
extending beyond the middle of the abdomen; thorax narrower 
