244 THOMAS SAY FOUXDATIOX 



with longitudinal slight rugosities ; hind ocelli three to 

 four times as close to eyes as to each other. Antennae 

 dark brown to blackish. 



Prothorax as wide or little wider than head ; wider than 

 long; widened posteriorly, angles sharp or narrowly 

 rounded ; surface slightly rugose ; margins usually brown 

 or yellowish, rest of prothorax dark brown. Legs brown ; 

 femora darker above ; tibia darker at both ends ; tarsi 

 dark. Wings subhyaline ; an inf uscated transverse area 

 across the cord and another at the tip of the forewings; 

 the pterostigma also is inf uscated ; Sc does not reach quite 

 to the cord ; one or two costal crossveins near the tip of 

 subcosta and one beyond ; Cul with only one or two ac- 

 cessory branches. 



Abdomen dark brown; cerci yellowish, short, composed 

 of five or six short segments. 



Male. Hind margin of ninth abdominal tergite with 

 two rearward pointing, rounded hairy knobs or lobes; 

 supra-anal process very short (hardly longer than the 

 knobs at the base of the cerci) heavily chitinized, up- 

 turned and ending in a gradually tapering blunt point, 

 the hind margin of the supra-anal process bears a mem- 

 branous, bulbose enlargement ; subanal lobes asymmetri- 

 cal, largely membranous (see plate 45, figure 3a) ; ninth 

 abdominal sternite greatly prolonged into a subgenital 

 plate which reaches beyond the tip of the abdomen and 

 medially narrows to a chitinous upturned process; ninth 

 sternite without a ventral appendage ; at the base of each 

 cercus occurs a rounded, bulbous knob. 



Female. Genital opening of eighth abdominal sternite 

 not covered by a subgenital plate ; ninth sternite with a 

 median, yellow, triangular process which reaches nearly 

 to the tip of the subanal lobes. 



Distribution.— March 21, 1905, Raleigh, N. C. (C. S. 

 Brimley) ; April 2, 1921, Melville, W. Va. (J. C. Bradley) ; 

 1877, Morgantown, N. C. (Morrison) ; March 23, 1902, 

 Rosslyn, Va. (H. S. Barber) ; April 5, 1901, Nashville, 

 Tenn. (E. B. Williamson) ; March 4-April 4, Washington, 

 D. C. (Warner & Barber) ; Feb. 19-April 18, Plummers 

 Is., Md. (Currie, Warner, Barber, Bradley) ; March 5- 

 April 14, Harrisburg, Pa.; W. Springfield, Mass. (George 

 Dimmock) ; March 30, 1889, Forest Hill, Mass. (S. Hen- 

 shaw) ; March 21-April 10, Ithaca, N. Y. ; April 5, 1902, 

 Karner, N. Y. ; April 22, 1902, E. Greenburgh, N. Y. ; April 

 11, 1901, Hamburg, N. Y. (E. P. Van Duzee) ; Mo. (C. V. 

 Riley) ; March 20-April 5, Riley Co., Kans. (F. Marlatt) ; 

 April 18, 1922, Minneapolis, Minn. (William E. Hoffman). 



