10 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.64 



bases narrowly paler; wings tinged with gray; stigma lacking; 

 R^ very short, the tip less than its own length from the tip of R^. 



Female. — Length, 5.8 mm.; wing, 7 mm. 



Rostrum yellowish testaceous; palpi dark brownish black. An- 

 tennae with the first scapal segment obscure yellow, the remainder 

 of the organ black. Front yellow; vertex dark brown, dusted with 

 yellowish gray. 



Pronotum yellow, broadly dark brown medially; scutellum con- 

 spicuously yellow. Mesonotal praescutum dark brown, without 

 conspicuous markings; tuberculate pits large, shiny, separated from 

 one another by a distance a little greater than the diameter of one; 

 scutellum obscure brownish yellow; postnotum similar, the posterior 

 half dark brown. Dorso-pleural membrane conspicuously yellow. 

 Pleura brownish yellow, variegated with dark brown, this latter 

 appearing as an interrupted longitudinal stripe. Mesosternum dark 

 brown. Halteres pale brown, the knobs conspicuously pale whitish 

 yellow. Legs with the coxae brown; trochanters yellowish bro^^^l; 

 femora dark brown, the bases narrowly paler; tibiae pale bro^^^l, 

 tipped with darker brown; tarsi dark brown. Wings with a faint 

 gray tinge; stigma lacking; veins dark brown. Venation: Sc^ end- 

 ing just before three-fourths the length of Rs, Sc^ faint, some distance 

 from the tip of Sc^, the latter alone nearly twice the basal deflection 

 of Cu^; r lacking; ^2 very short, nearly perpendicular to the end of 

 R2+S, at the margin not far from the tip of R^, the space on costa 

 between R^ and i?, being a little less than R^; R2 ^ little less than 

 one-fourth R^; R2+3 a very little longer than R^ alone, the latter 

 gently arcuated; veins issuing from cell 1st M^ relatively long, 

 gently arched as in the genus; basal deflection of Cui about its own 

 length beyond the fork of M. 



Abdomen pale brown; base of the ovipositor yellow. Ovipositor 

 with the tergal valves elongate, slender, horn-colored. 



Described from one female, collected at Hurricane, Alaska, July 15, 

 1921 (J. M. Aldrich), 



Type.— Female, Cat. No. 26088, U.S.N.M, 



LIMNOPHILA (NEOLIMNOPHILA) ULTIMA ALASKANA, new subspecies. 



Similar to typical ultima Osten Sacken, differing as follows: 

 Wings conspicuously broader in both sexes and more nearly hya- 

 line; stigma pale but distinct. Male hypopygium with the pleurites 

 much longer and more slender; outer pleural appendage with the 

 straight basal portion very long in proportion to the curved apical 

 hook. The smaller of the two spines at the base of the pleurites is 

 much longer and more conspicuous than in typical ultima. 



Described from one male and four females: the male collected at 

 Healy, Alaska, July 24, 1921 (J. M. Aldrich); the females at Flat, 

 Alaska, August 5, 1919 (U, S, Biol. Surv., A. H, Twitchell). 



