OSBORN AND BALL STUDIES OF NORTH AMERICAN JASSOIDEA. 75 



rows, another larger lateral one on the base of each segment on either 

 side, forming a lateral row. 



Genitalia: Ultimate ventral segment long, convex, the posterior 

 margin very slightly ])roduced on the middle half, pygofers remarkably 

 long, extending beyond and entirely concealing the ovipositor, their 

 acute tips compressed above, slightly divergent below, and fringed 

 with fine hairs. 



Described from two females collected at Little Rock, Iowa, July i, 

 1897. 



The genus Dorycephaliis was founded on two female examples de- 

 scribed as D. haeri from Southeastern Russia, and up to the present 

 time the male has not been described. The only other species of the 

 genus so far described, and the onl\- one of which the life history or 

 the male is known, is D. platyrhynchus. The examples of D. vamhizei 

 were swept from high prairie land where the only grass with a stem 

 apparently large enough to support them was Sporolwlus ciispidatus. 

 If the life history is similar to that of D. platyrhynchus these were the 

 last of a brood, the males having all disappeared some time before. 

 From our knowledge of the latter species it may be inferred that the 

 males will be smaller, dark colored and with a shorter head, long ely- 

 tra and filly developed wings, and that there will also be a macrop- 

 terous form uf the female occurring in limited numbers and soon dis- 

 appearing, while the brachypterous form, which is still, clumsier than 

 that of the D. platyrhynchus, probably rarely leaves the original host 

 plant. 



Deltocephalus imputans n. sp. 



Form very similar to albidus or reflexus, vertex as long and even 

 more sharpl\- margined than in reflexus, creamy-yellow above with two 

 small spots on the ti|) of the vertex and four dashes margining the 

 reflexed veinlets, black. Length, 9, 4mm.; (J, 3.50 mm. 



Vertex nearly half longer than wide, twice longer than against eye, 

 acutely angled, disc flat or slightly depressed, margins sharp, tip 

 thickened, slightly elevated, a slight transverse furrow just behind 

 ocelli on the upper edge of the margin nearly one-fifth the distance 

 from the eye to the tip. Front, similar to albidus, less than twice 

 widei above than on clypeus, side margins nearly straight and contin- 

 uous with those of clypeus, genee rounding or but slightly angled. 

 Pronotum two and one-fifth times wider than long, curvature of front 

 margin, about half its length, posterior margin shallowly emarginate, 



