240 THOMAS SAY FOUNDATION 



more or less interrupted. Cerci of male composed of one 

 segment, in the female of six or seven segments. 



Male. Very similar to T. nivalis Fitch. Supra-anal 

 process short, upturned, largely membranous, finely 

 roughened or spinulose at tip ; at least twice as wide at 

 base as near the tip; subanal lobes large, triangular, un- 

 evenly chitinized ; cerci composed of a single globose seg- 

 ment, more heavily chitinized above, hairy and at the tip 

 somewhat emarginate ; ninth abdominal sternite produced 

 into an evenly rounded subgenital plate which bears near 

 the center a ventral lobe or appendage. 



Female. Genital opening near the middle of the eighth 

 abdominal sternite, not covered by a subgenital plate ; hind 

 margin of ninth sternite somewhat produced and evenly 

 rounded. 



Distribution. — Washington, D. C, March 2, March 5, 

 March 11-12 (H. S. Barber) ; Plummers Is., Md., Feb. 22, 

 1922 (H. S. Barber) ; Plummers Is., Md., Feb. 24, 1903 

 (R. P. Currie) ; Rosslyn, Va., March 23, 1902 (H. S. Bar- 

 ber) ; Gloversville, N. Y., March 28, 1907 (C. P. Alex- 

 ander) ; Harmony, Col. Co., Nova Scotia, March 20, 1924 

 (W. H. Brittain). 



Taeniopteryx nivalis Fitch. 



(Plate 33, fig. 1; plate 44, figs. 3, 4; plate 46, fig. 8.) 

 1847. Taeniopteryx nivalis Fitch, Emmons Jour. Agr. Sci., 5:274. 



Length to tip of wings, male, 11-14 mm. ; female, 13-17 

 mm. Expanse, male, 17-23 mm. ; female, 22-28 mm. 



General color dark brown to blackish. 



Head about as wide as prothorax, hairy ; tubercles at 

 base of antennae dark brown and somewhat triangular in 

 shape; a dark brown or black area in front of anterior 

 ocellus ; occiput quite rugose ; hind ocelli only about three 

 diameters distant from the eyes; antennae brown, com- 

 posed of about fifty-five segments. 



Prothorax brown to black, the margins lighter, partic- 

 ularly the front margin ; wider than long, widened behind ; 

 angles more or less rounded ; surface nearly smooth ; a few 

 rounded raised marks near the front angles often visible ; 

 a short, narrow, transverse, depression in the center of 

 the pronotum (more often broken by the median longi- 

 tudinal line). Legs brown to blackish. Wings hyaline 

 to infuscated, in the specimens with infuscated wings, two 

 faint transverse lighter bands are sometimes visible in 

 the fore wing, one band before the cord and the second 

 beyond the cord ; subcosta gradually bends upward until 



