IOWA ACADEMY OP SCIENCES. 203 



inside the margin before the ocelli, an obscure rectangular mark just on 

 either side the center and an oblique spot near the base, brown. Pronotum 

 and scutellum faintly lined. Elytra sub-hyaline, nervures light, sometimes 

 faintly margined; oblique band reduced to two spots; usually a dark blotch 

 in the third apical cell and reflexed nerves lightly margined. Below, dirty 

 white; upper half of the face usually dark with white arcs. Tergum with 

 four black stripes, outer pair widest at base. 



Genitalia: Ultimate ventral segment of female very long, central fourth 

 slightly produced, notched in the center, arcuated and dark colored each 

 side of the notch. Male genitalia much enlarged; pygofers enlarged, 

 inflated, spoon-shaped, their tips compressed; last tergite much enlarged, 

 inflated, compressed laterally and terminally against the pygofers. Valve 

 large, acutely angled, plates small, about twice the length of the valve, 

 roundingly pointed, distended, and sometimes notched at tip by the sharp 

 edge of the pygofers. Described from eighteen specimens. 



The enlargement of the male genitalia, though not peculiar to 

 this species alone, is rendered all the more striking from the fact 

 that it is ordinarily met with only in the males of short- winged 

 forms usually placed in the genus Athysanus, while long winged 

 forms of the same species in that genus have genitalia of normal 

 size. The males of this species, however, are all long- winged and 

 have constantly deltocephaloid venation and enlarged genitalia. 



This species very much resembles reflexus, but has a broader 

 head, stouter vertex and longer elytra, giving it a linear rather 

 than a wedge shape. Specimens have been collected at Ames 

 for a number of years and two examples were received from 

 Colorado through Professor Gillette. 



Adults have been taken rather sparingly through the last 

 half of June, rather commonly through the first week in July, 

 and one battered specimen the first of August. No larvae have 

 been taken or food plant determined. 



DELTOCEPHALUS REFLEXUS N. SP. 

 (PI. xxil, Fig. 1.) 



Form very similar to that of albidus, but the vertex is longer, 

 narrower and more acutely angled and the elytra more round- 

 ing. Light cinereus above, the upper half of the face sharply 

 black, lower half white. Length, 4 to 4. 50 mm. Width, 1.75 mm. 



Vertex: Length on middle nearly three times that at eye, nearly twice 

 longer than wide, anterior angle acute, tip blunt. Front narrower above 

 than in fni^atus, facial angle slightly more acute; geuse moderately full, 

 outer angle distinct; lone only meeting the extreme tip of front, enclosing 

 the clypeus. Pronotum short, truncate behind, posterior angles indefinite; 

 elytra flaring, without an appendix; costal veinlets reflexed, even more 

 strongly than in albidus; third apical cell wedge-shaped, twice larger than 

 anal, veins on clavus coalescent through the median third of their length. 

 3 



