OSBORN AND BALL — STUDIES OF NORTH AMERICAN JASSOIDEA. 6 I 



Vertex narrower next eye than in sangiiinolenta, more produced 

 and rounded between the ocelli, face more rounding, genae scarcely 

 angulate. Front similar to sangiiinolenta, the basal suture more round- 

 ing, pronotum similar to sangiiinolenta. Elytra longer, less convex, 

 apical cells longer. 



Color: Grayish-brown tinged with yellowish. Vertex with two 

 round black spots smaller than in sangiiinolenta, a broad median line 

 enclosing a narrow light line, an arcuated line on either side arising 

 from a spot at the inner posterior angle of the eye, then curving out 

 to a point near the ocelli, with which it is connected by a short line, 

 then back to the margin of the e}e and obliquely down to the frontal 

 suture above the antennae, reddish-brown, ocelli bright red. Face 

 marked much as in sa?iguinolenfa, the frontal suture much more arcu- 

 ated, less distinct. Pronotum cinereous-brown, an arcuated row of 

 coalescent dots back of the anterior margin, three pairs of more or 

 less distinct dark-brown longitudinal lines, the inner pair enclosing a 

 narrow light line. Elytra, base fuscous with light nerves, remaindet 

 hyaline with dark nerves; no indication of transverse bands as in san- 

 guinolenta. 



Genitalia: ?, ultimate ventral segment broad, laterally parallel- 

 margined from the base one-half its length, then the surface depressed 

 and the margin roundingly narrowing one-fourth the entire width, 

 posterior margin excavated from the acute lateral angles by three suc- 

 cessive steps, the first being strongly oblique, to the bottom of a nar- 

 row median notch reaching over lialf-way to the base of the segment. 

 cT, valve twice wider than long, anterior and posterior margins paral- 

 lel, side margin straight, oblique ; plates nearly three times the length 

 of the valve, the margins rolled up forming a half cylinder with a di- 

 ameter slightly greater than the truncate apex of the valve, the ends of 

 the plates convexly folded closing the end; pygofers only appearing 

 from below as a fold around the base of the plates. Suture between 

 the plates broadly dark, towards apex. 



Described from numerous examples collected in Arizona by Prof. 

 Gillette, to whom it is dedicated as a slight acknowledgment of the 

 favor extended in placing all of his available material at our disposal. 



A very distinct little species, slightly smaller and of more uniformly 

 fuscous than sangiiinolenta, shorter and darker than uhleri. Readily 

 separated from either by the very distinct genitalia of either sex. 



Proc.^D. A.'N.^S., VOL..VII.] 8 [January 6, 1898.] 



