April, 1920] Crane- Flies of Alaska 197 



Tribe Limnophilini. 



Genus Limnophila Macquart. 



Limnophila subunica, sp. n. 



General coloration gray; wings long and narrow, grayish subhyaline, 

 the stignia and small clouds at the origin and end of Rs brown; radial 

 sector longer than R2+3. 



Male. — Length, 8 mm.; wing, 8.6 mm. 



Rostrum light gray; palpi brown. Antennae of the male elongated; 

 basal scapal segment brown, sparsely dusted with gray; second scapal 

 segment yellowish brown; flagellar segments brownish black, the basal 

 segments indistinctly yellowish at the extreme base, the segments pro- 

 vided with a conspicuous white outspreading pubescence and mod- 

 erately long verticils. Head gray. 



Mesonotal prsescutum yellowish gray with a barely indicated darker 

 median stripe; remainder of the mesonotum and the pleura clear light 

 gray, the dorso-pleural membrane brown. Halteres very pale brown, 

 the knobs dark brown. Legs with the coxse yellow, indistinctly darkened 

 at the base; trochanters yellow; femora dark brown, more yellowish 

 basally, this color narrowest on the fore legs, broadest on the hind legs 

 where only the tips are darkened; tibias and tarsi dark brown. Wings 

 much longer and narrower than in L. unica; grayish subhyaline, marked 

 as follows: stigma conspicuous, oval, dark brown; a faint brown cloud 

 at the origin of Rs and a larger and more conspicuous seam at r-m and 

 the deflection of R4+5; outer end of cell 1st Mo indistinctly seamed with 

 brown; veins brownish black. Venation: Rs long, only slightly arcuated 

 at origin, from one-third to one-fourth longer than R2+3; r at the tip 

 of Ri, inserted on R2 about twice its length beyond the fork of R2+3; 

 cell 1st M2 long and narrow, with the basal deflection of Cui inserted at 

 about one-third its length ; cell Mi nearly twice the length of its petiole 

 which is about one-half longer than the basal deflection of Cui. 



Abdomen brownish gray, the basal sternites more yellowish. 



Habitat. — Alaska. 



Holotype, cf , Katmai, June 10, 1919 (Jas. S. Hine). 



Limnophila suhimica is closely allied to L. unica Osten 

 Sacken of North-eastern North America, from which it is 

 readily told by the long, narrow wings with Rs elongate and 

 scarcely arcuated at origin, cell 1st M2 long and narrow, with 

 the basal deflection of Cui near one-third its length, and other 

 characters. The specimens of L. unica recorded by Coquillett 

 (Proc. Washington Acad. Sci., Vol. II, p. 399; 1900) from 

 Yakutat and Sitka presumably refer to the present species. 



