OSBORN AND BALL —STUDIES OF NORTH AMERICAN JASSOIDEA. 8 I 



irregular nervures running to the costa from the first sector, under 

 wings as long as elytra, folded. 



Genitalia: 9, ultimate ventral segment twice wider than long, 

 longest on the rounding lateral lobes, middle half of the posterior 

 margin roundingly emarginate, with a median roundingly triangular 

 tooth, emarginate portion four times the width of the base of the 

 tooth, tooth and lateral lobes light, lateral margins of emargination 

 sharply black, pygofers long, slightly exceeding the ovipositor, thickly 

 beset with stiff bristles: cf, valve triangular, twice wider than long, 

 plates convexly widening from the base, then concavely narrowing to 

 the obtuse, obliquely divergent apices; pygofers long, compressed, ex- 

 tending beyond the plates, their tips and sides studded with strong 

 spines. 



Described from numerous specimens swept from Sporobolus at Little 

 Rock and Sioux City, Iowa, July 1-7, among which were six macrop- 

 terous females. One macropterous female was received from Prof. 

 Gillette and another is in the V. D. collection, both from Colorado. 



The brachypterous form can not be confounded with any other de- 

 scribed North American species. The macropterous form superficially 

 resembles melshehneri but may be readily separated by the genitalia, the 

 extreme length of the abdomen or by the strikingly parallel appear- 

 ance of the costal margins of the elytra. Though not agreeing in every 

 respect with Fieber's drawings, yet on comparison of our specimens 

 with European examples from Dr. Melichar it was found that no such 

 differences existed, and it would seem that Fieber's drawings were not 

 exact. 



Deltocephalus obesus n. sp. 



Form and appearance of signatifrons nearly, but with the vertex 

 shorter and rounder and with a row of black spots on the anterior 

 margin. Length of body, ? 2.75 mm., cT, 2.25 mm.; width, 1.5 mm. 



Brachypterous form: Vertex broad and short, width at base and 

 length about equal, two-fifths longer on middle than at eye. Face 

 broad, convex, broadest across antennal pits, rounding slightly above, 

 more rapidly below to the narrow clypeus; clypeus nearly twice longer 

 than broad, suture obsolete, genae narrow, outer angles rounding. 

 Pronotum broad and flat, more than twice wider than long, length 

 equalling that of the vertex, anterior margin broadly evenly round- 

 ing, humeral margins straight, oblique, side margins distinct, carinate. 



