April, 1920] Crane- Flies of Alaska 199 



SUBFAMILY TIPULIN^. 



Tribe Tipulini. 



Genus Stygeropis Loew. 



Stygeropis ominosa, sp. n. 



Female. — Length 16 mm.; wing, 15.8 mm. 



Generally similar to S. hergrothi Williston, differing as follows: 



Size larger. Frontal prolongation of the head entirely dark in color. 

 Antennas with the first scapal segment dark brown, transversely 

 wrinkled; second scapal and first flagellar segments conspicuously red- 

 dish yellow, the remainder of the flagellum gradually passing into black. 

 Head obscure gray, the middle of the vertex suffused with brown, paler 

 adjoining the inner margin of the eyes. 



Thorax brownish gray, with three dull gray stripes that are indis- 

 tinctly paler medially, the median stripe split by a capillary black line. 

 Halteres with the base of the stem bright yellowish brown. Legs 

 comparatively stout, especially the fore legs. Wings with a strong 

 fulvous brown tinge that is about intermediate in intensity between 

 5. dimidiata and S. fuscipennis. Abdomen obscure gray, the caudal 

 margins of the segments narrowly pale, the lateral margins of the 

 tergites broadly yellowish buff", the dorso-median area suffused with 

 brown; ovipositor horn-colored. 



Habitat. — Alaska. 



Holotype, 9 , Savonoski, Naknek Lake, July, 1919 (J as. 

 S. Hine). 



Stygeropis fuscipennis Loew. 



1865 Stygeropis fuscipennis Loew; Berliner Ent. Zeitschr,, Vol. 9, p. 129. 



A specimen of each sex from Savonoski, Naknek Lake, 

 July, 1919. 



Stygeropis dimidiata Loew. 



1865 Stygeropis dimidiata Loew; Berliner Ent. Zeitschr., Vol. 9, p. 129. 



A number of specimens of both sexes, from Savonoski, 

 Naknek Lake and Katmai, June, 1919. This series shows that 

 this species varies considerably in the coloration of the frontal 

 prolongation of the head and, to a slight degree, in the pattern 

 of the mesonotal praescutum. 



