MORGAN HEBARD IO7 



bolliana, third joint slightly long(;r man lourth or fifth joints, which latter are (nor- 

 mally) subequal in length. Pronotum with greatest width at mesal point. i'^^ with 

 angles of cephalic and caudal margins (normally; showing a similar curvature; 

 oblique sulci of disk very decided and as in virginica. Tegmina and wings much 

 as in virginica; wings (in the series) with two to six incomplete and five to eight 

 complete rami of the ulnar vein. Median segment supplied mesad with two weakly 

 arcuate, moderately raised ridges, which are weakly convergent cephalad, with 

 brief cephalic faces each supplied with a heav}- tuft of hairs, the surface of the seg- 

 ment is further supplied with minute scattered hairs cephalad of these ridges. 

 Other dorsal segments unspecialized, distal margin of sixth segment showing very 

 feeble, lateral, broad concavities and a very feeble, broad convexity mesad. Supra- 

 anal plate about twice as broad as long, free margin embracing bases of cerci, very 

 weakly convex about them, thence nearly straight, convergent to broadly rounded 

 apex; surface of plate convex above cerci, evenly deplanate and declivent distad in 

 remaining principal portion. Cerci slender, with (normally) eleven joints, decreas- 

 ing evenly in size distad. the sixth to ninth joints with inner distal angles acutely 

 but briefly produced, i" (jenital hook situated sinistrad, a chitinous process recurved 

 at decidedly less than a right-angle, moderately elongate, with recurved portion 

 well broadened; mesad and adjacent is situated a very elongate process, with distal 

 chitinous portion aciculate and cur\ed weakly sinistrad. Subgenital plate with 

 surface moderately convex, e.xcept toward bases of styles, where it is moderately 

 concave; lateral margins weakly convex and very weakly convergent in proximal 

 half, very weakly concave and more strongly convergent in distal half, the con- 

 cavity slightly greater, but its extent distinctly less, on the dextral margin, remain- 

 ing distal portion of free margin nearly transverse, very weakly concave and slightly 

 oblique, due to the slightly greater sinistral production of the plate: simple, slender 

 styles, similar in size and form, situated at the rounded disto-lateral angles of the 

 plate, in sockets on the ventral surface, in length (normally) each equal to about half 

 the distance between their bases. Exposed portion of eighth dorsal abdominal 

 segment, which is folded over the base of the subgenital plate, decidedly short, no 

 longer than exposed portion of se\enth ventral abdominal segment. 



Characters of Female. — (W'hitemarsh. Pennsylvania.) Size medium, form broad. 

 Head broader and more evenly convex than in male. Interocular width slightly 

 greater than that between antennal sockets. Minute ocellar spots present. Pro- 

 notum moderately convex, without discal sulci, ample, with point of greatest width 

 near caudal margin, which is truncate, very weakly convex; the lateral margins 



^^ Rarely individuals show a condition more nearly as in fiilvescens, with point of 

 greatest width slightly more caudad; due to a weaker convexity of the caudal margin of 

 the pronotum, or to a slight broadening of the curve of the lateral angles of its cephalic 

 margin. 



'^ In occasional specimens the degree of production of these angles shows slight differ- 

 ences. In but one, of the two hundred and twenty-nine males before us, could the cer- 

 eal structure be confused with the simple type found m fulvescens, this character being 

 one of the most useful in separating the males of these two species. 



MEM. AM. EXT. SOC, 2. 



