THE CANADIAN ENTOMOLOGIST 63^ 



deflection of Cii\ at or just beyond the fork of M, about in a line 

 Avith cross-\-ein ;--/;/ ; cross-vein m rather indistinct. 



Abdominal segments dark brown, the caudal and lateral 

 margins narrowly paler, hypopygium with the pleurites bright 

 \ellow. 



The female is similar to the cf but slightly larger, full-winged; 

 ovipositor powerful, yellow, strongly upturned. 



Habitat. — Colorado. 



Holotype, cf, Platte Canon, Colorado, July 17,1915, (Oslar.) 



Allotype, 9 , with the type. 

 This little species differs from both dehilis Will, andvitripennis 

 Doane, in the considerably smaller size; it differs from debilis in 

 the paler fawn colour of the body, the long petiole of cell M\, the 

 structure of the antennae, and in numerous other details; from intri- 

 pennis in the gray head, dark antennae, differences in the thoracic 

 pattern and colour of the abdomen and its appendages. It differs 

 from the more closely related septentrionalis Bergr. in the unmarked 

 wings and fawn-coloured body. 



Tricyphona glacialis, sp. n. 



Allied to T. dehilis Will.; colour dark brown; antennae dark 

 brown throughout, the flagellar segments oval to rounded-oval, 

 not attenuated; wings with a pale brown suffusion; cell 1st Mi and 

 and Ml \-ery long; abdomxcn dark brown, the basal sternites more 

 yellowish. 



Male. — Length 9.6 mm.; wing 10.6 mm. 



Rostrum and palpi dark brown. Antennae dark brown, the 

 segments of the flagellum oval, the basal ones not crowded, the 

 apical ones shortened, almost rounded. Head broad, black, very 

 sparsely grayish pruinose; frontal tubercle distinct, high. 



Mesonotum dark brown, very sparsely gray pruinose on the 

 postnotum, the scutellum paler, more yellowish. Pleura dark 

 brown, gray pruinose. Halteres very long and slender, brown, 

 brightened at the extreme base. Legs with the coxae brownish 

 yellow; femora dull yellow, passing into brown on the apical third; 

 tibiae brownish yellow, a little brighter basally; tarsi dark brown. 

 Wings with a pale brown tinge; stigma indistinct; veins brown. 

 Venation: petiole of cell Ri moderate, a little shorter than the 

 elongated cell 1st Mi\ petiole of cell M\ about one-third the length 



