182 IOWA ACADEMY OF SCIENCES. 



Full-grown larvae were swept from prairie grass July Gth. 

 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 larvae are doubtfully referred to this species which, 

 if correct, would indicate Elymus as the larval food plant. 



EUACANTHUS ACUMINATUS FAB. 



(PI. xix, Fig. 3.) 



Cicada acuminata, Fab. Syst. Ent. IV, 36, 40, 1794. 

 Euacanthus orhitalis. Fitch. Homop. N. Y. State Cab , p. 57. 



Fitch's description of orhitalis 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 segment of the female long, 

 rounding, posterior margin arcuated and slightly notched. 

 Male valve obtuse, short; plate long and very narrow, exceed- 

 ing the pygofers. 



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 



