232 THE CANADIAN ENTOMOLOGIST. 



the structure of the basal clasp segment. Both sexes were taken 

 by Mr. C. P. Alexander, August 22, 1910, at Woodworth's Lake, 

 Fulton County, N. Y. 



Male. — Length 5 mm. Antennae probably as long as the body, 

 sparsely haired, dark yellowish brown; probabh' 15 segments, the 

 fifth having the two portions of the stem nearly equal, each with 

 a length one-half greater than the diameter. Palpi; the first 

 segment irregular, with a length about twice its diameter and 

 apically with an irregular, quadrate, pseudo-segment ; the second 

 segment extremely slender, with a length fully ten times its diameter 

 and at the basal third a pseudo-articulation. Mesonotum reddish 

 brown, the submedian lines and posterior median area, scutellum 

 and postscutellum mostly brownish yellow. Abdomen dark brown. 

 Genitalia fuscous yellowish, the basal clasp segment subrectangular, 

 with a length about three times its diameter and a conspicuous, 

 broadly rounded internal lobe at the basal third; terminal clasp 

 segment stout, curved, diameter nearly uniform, fuscous apically; 

 dorsal plate broad, broadly and irregularly emarginate, the lobes 

 broad and tapering irregularly to a narrowly rounded, setose apex; 

 ventral plate long, spatulate, sparsely setose, broadly and roundly 

 emarginate distally. 



Female. — Length 5 mm. Antenna^ missing. Palpi; the first 

 segment subglobose, the second rectangular, with a length one-half 

 greater than its diameter, the third greatly produced, with a 

 length fully ten times its diameter. Mesonotum a variable reddish 

 brown, the submedian lines brownish yellow. Scutellum and 

 postscutellum mostly fuscous yellowish. Abdomen sparsely haired, 

 dark reddish brown. Halteres yellowish transparent. Coxse 

 yellowish brown, legs a variable straw colour, the articulations 

 slightl>' darker. Ovipositor short, the terminal lobes broadly o\'al 

 and thickly clothed with short, stout seta\ minor lobes triangular, 

 with a few coarse seta? on the rounded apex. Type Cecid. 1596. 



The female, Cecid. 1595 is referred with little question to the 

 same species, a procedure justified by similar abdominal structures 

 and the capture of the two on the same date and under presumably 

 identical conditions. The specific name is given on account of the 

 peculiar, light coloured, window-like spots in the body walls of the 

 abdomen. 



