THE CANADIAN ENTOMOLOGIST - 325 



and a faint seam along the cross- vein r-m; venation: Sc long, 

 extending beyond mid-length of the long sector; Ri and R2 scarcely 

 contiguous at the wing-margin; basal deflection of Cui before the 

 fork of if; basal deflection of Ms absent. 



Abdominal tergites dark brown, the caudal and lateral margins 

 dull yellow; segment eight largely yellow except the extreme base 

 which is brown; segment nine yellow with a narrow basal ring 

 with a slight median projection caudad; sternites dark brown, 

 deepest sublaterally, the caudal and lateral margins dull yellow. 

 Hypopygium having the ninth tergite with a deep, narrow median 

 notch, the lateral angles rounded. Ninth pleurite stout, the outer 

 angle produced caudad into a slender fleshy lobe that is pointed 

 at the apex and sparsely provided with setigerous tubercles; 

 dorsal pleural appendage a triangular fleshy lobe that is provided 

 with long coarse hairs; ventral pleural appendage, a two-armed 

 chitinized rod whose outer ventral arm is stout basally, narrowed 

 toward the apex which is again expanded into a blunt tip; the 

 inner arm bends dorsad, slender, tapering into an acute blackened 

 apex. Penis-guard prominent, the sides subparallel, the apical 

 half on the dorsal surface with numerous hairs, the apex produced 

 ventro-caudad into a prominent median lobule. 



Habitat — Western America. 



Holotype — cf, Blue Lake, Humboldt Co., California; June 

 20-27, 1907 (J. Chester Bradley). 



Allotype — 9 , topotypic. . 



Paratypes — Icf, 19, topotypic; 19, Peachland, British 

 Columbia, May 19, 1912; 1 9, topotypic, June 24, 1903. 



The type is in the collection of Cornell University, paratypes 

 in the collection of the author. The two last-named paratypes 

 were earlier determined as G. blanda O. S. (Proceed. Acad. Nat. 

 Sci. Phila., October, 1914, p. 286, 287). 



This interesting species is nearest to G. blanda O. S. dififering 

 in the striped pleura, the long subcosta with a dark blotch at its 

 tip, the slight amount of dark colour in the apices of cells Rz 

 and Rb, and in conspicuous details of the male hypopygium. 



