1915.] NATURAL SCIENCES OF PHILADELPHIA. 483 



Pronotum blue-gray, indistinctly brownish medially and on the 

 sides. Mesonotal praescutum blue-gray with distinct rich brown 

 stripes, the median one split by a narrow ground line; the lateral 

 stripes broadly centered with, the ground color; scutum gray, the 

 lobes marked very indistinctly A\ith brown; scutellum and post- 

 notum gray infuscated with blackish, the former medially, the 

 latter as a patch on either side. Pleura clear gray, the dorsopleural 

 membranes yellowish brown. Halteres short, yello^\ish brown, the 

 knobs a little darkened. Legs with the coxse clear hght gray; tro- 

 chanters bro\\aiish black; femora dull yellow, the apex broadly brown; 

 tibiae brown, more yello^^dsh on the basal third; tarsi dark brown. 

 Wings subhyaline with a slight gray tinge; the stigma is oval, dark 

 bro'um; a very faint bro^\m tinge along vein Cu and its deflection; 

 costal cell not brightened; a large vitreous spot before and beyond 

 the stigma. ^>nation: Rs long, almost straight, as long as or 

 slightly longer than Rz. but shorter than i?4f5; cell Mi short petiolate, 

 this petiole a little shorter than cross-vein r-m; cross-vein m-cu 

 punctiform. 



Abdominal tergites dull gray -with three narrow browm lines which 

 are almost continuous; the lateral margins of the sclerites are broadly 

 pale yellowish, this extending to and including segment seven; 

 segments eight and nine uniformly dark. Sternites light gray, the 

 segments margined with yellowish, laterally very broad, caudally 

 very narrow. Ovipositor (see Plate XXI, fig. 85) very small, the 

 last segment narrowed, the upper valves small, flattened, transverse 

 in position, the base broadened tapering to the acute apex, the 

 valves divaricate; lower valves short, somewhat fleshy. 



The fly is provided with abundant long white hair, on the head, 

 thorax, coxse and somewhat shorter and more appressed hairs on the 

 abdominal tergites. 



Habitat. — Arctic America. 



Holotype, 9 , Hudsons Bay Territory (Kennicott). 



The type is in the collection of the Museum of Comparative 

 Zoology. The insect is part of the Loew collection and the name 

 adopted above is a manuscript name of Loew's appearing on the pin. 



This species is most closely allied to Tipula besselsi 0. S. The 

 types of the two species have been compared in the collection of 

 the Museum of Comparative Zoology and the differences are as 

 follows : 



1. Color of the thorax dull light gray with four light brown stripes; 

 median vitta of the head indistinct; dorsal abdominal vitta 



