1915.] NATURAL SCIENCES OF PHILADELPHIA. 491 



cell Mi, sometimes indistinct and difficult to detect; veins dark 

 brown. Venation (see Plate XVI, fig. 13): R2 beyond cross-vein 

 r long, persistent, much longer than -R2+3; basal deflection of Ri+i 

 nearly obliterated so that the radial sector is in a line with i^4+5. 



Abdominal tergites with a dark brownish black, interrupted, 

 dorso-median line; a much less distinct pale brown lateral stripe; 

 ninth segment darker, brownish black; the caudal margin of the 

 segments very indistinctly grayish; sternites pale brown. Male 

 genitalia with the ninth tergite large, subquadrate, the caudal 

 margin with a deep U-shaped notch, the lateral lobes subtruncate, 

 not at all pointed. Ninth pleurite large, complete, with three 

 appendages (see Plate XX, fig. 68) the outermost and most caudad 

 is a flattened lobe which is narrowed into a sharp, curved point at 

 the tip, the outer face of the blade of this appendage is densely 

 provided with long, delicate, pale hairs; the next appendage consists 

 of a broad foliaceous blade whose inner margin near the tip is pro- 

 longed into a short, black, heavily chitinized lobe and whose main 

 portion is produced entad and cephalad into a conical lobe; the 

 third appendage, which lies the furthest cephalad but is almost as 

 far laterad in position as the first appendage, is a slender fleshy lobe 

 which is densely provided with long, coarse, black hairs. Ninth 

 sternite deeply and profoundly split mechally, at its caudal angle 

 bearing a short, fleshy pendulous appendage as in this and related 

 groups of species in this genus. Eighth sternite with the caudal 

 margin broadly concave, this concavity with about a dozen long 

 hairs, the sides of the concavity "^dth a bunch of about five long 

 reddish hairs. 



The female has the antennae indistinctly bicolored, the bases of 

 the individual segments only slightly darkened; in some specimens 

 the thoracic stripes are quite indistinct; o\"ipositor with the upper 

 valves broad at the base, rapidly tapering to the subacute slender 

 point; lower valves shorter, compressed-flattened, blade-like, acute 

 at the tip. 



Habitat. — Northeastern United States. 



Holotype, 0^, Bennett Lake, Hope Township, Hamilton Co., 

 N. Y., altitude 1,500 feet, September 12, 1912 (Alexander). 



Allotype, 9 , topotypic. 



Paratypes, No. 1, cf, Delaware Water Gap, Warren Co., N. J., 

 July 9 (Johnson) ; No. 2, 2 d^ 's, Manlius, Onondaga Co., N. Y., August 

 20 (Comstock); No. 4, 2 d^'s, topotypic; No. 6, 5 d" 9 , Plummer's 

 Island, Maryland, July 21, 1915 (McAtee and Alexander); No. 11, 



