OSBORN AND BALL — STUDIES OF NORTH AMERICAN JASSOIDEA. 49 



vertex and two near posterior margin of pronotum. Length of ?4 mm., 

 width, 1.75 mm; cf slightly smaller. 



Vertex short, transverse, more than five times wider than long, pos- 

 terior edge crescentiform, slightly arcuated and elevated from the pro- 

 notum, anterior edge rounding to the face. Face broad and short, 

 outer angle of the genge prominent. Front broad and short, superior 

 third abruptly expanded over the antennal bases, suture above nearly 

 transverse, slightly arcuated and angled medially. Pronotum very 

 finely punctured, more than twice wider than long, anterior margin 

 strongly produced between the eyes, broadly depressed either side of 

 the middle, lateral margin obsolete, the humeral nargin touching the 

 eye, posterior margin slightly emarginate. Scutellum equilaterally tri- 

 angular, the apex produced. Elytra broad, convex, slightly longer 

 than abdomen; at rest the costal margins are wider than across eyes, 

 giving the insect a very compact appearance; venation very constant 

 with the exception of the second cross nervure, which is often want- 

 ing, the bases of the four inner apical cells in a transverse line. Ab- 

 domen slightly crested. 



Color: Above, obscure yellowish-brown, vertex yellowish-brown 

 with two oblique black spots equidistant from each other and eyes, a 

 faint brownish median line extending down to frontal suture, below 

 which is lined with darker, antennal pits broadly black, facial sutures 

 and tip of clypeus dark brown, sometimes brownish arcs on front, em- 

 phasized in two lateral rows of fuscous points. Pronotum yellowish- 

 brown, darker in front, two distinct black spots near the posterior 

 margin slightly larger and farther apart than those on the head. In 

 highly colored examples there appears a median brown line, an oblique 

 crescent near the humeral margin, and the anterior depressions become 

 much darker. Elytra uniformly smoky subhyaline with lighter ner- 

 vures, tergum and venter varying from yellow to fuscous, last ventral 

 segment and genitalia light-yellow in both sexes. 



Genitalia: ?, ultimate ventral segment broad, slightly narrowing 

 behind, anterior and posterior margins parallel, posterior margin usu- 

 ally arcuated or angularly elevated, giving it an emarginate appear- 

 ance; pygofers broad and short, less than twice the length of the ul- 

 timate segment. (^ : Valve large, twice broader than long, lateral 

 margin enclosing base of plates, posterior margin obtusely medially 

 produced, plates together forming a triangle slightly longer than wide 

 at the base, one-half longer than valve. 



Specimens are at hand from Ont., N. Y., N. H., D. C, la., Kans., 

 Ky., Ark., Neb., and Colo. 



