Diptera 35 c 



The radial vein is setose. Costa extends almost to apex of upper fork of media, 

 ihe posterior branch of media runs nearly straight from fork to wing margin. 



Length, 3 mm. 



Locality: Teller, Alaska, August 3, 1913 (F. Johansen). 



Sciara, sp. 2. 



_ Two females in poor condition. These differ from the preceding species 

 m havmg the first vein ending in costa sUghtly before furcation of media, the 

 latter originating midway from cross-vein to base of radius, and gradually diverg- 

 mg from anterior branch of cubitus, the cell between the anterior branch and 

 radius, and narrowed basally. 



Length, 2-75 mm. 



Locality: Bernard harbour, Dolphin and Union strait. Northwest Terri- 

 tories, August 22, 1915 (F. Johansen). 



Sciara, sp. 3. 



This species differ from the preceding one in having the first vein ending in 

 costa a httle over midway from cross-vein to fork of media, the latter originating 

 one-third of the distance from cross-vein to base of wing and the third branch 

 of raditis ending closer to apex of wing, nearly in vertical fine with apex of pos- 

 terior branch of cubitus. » 



Length, 3 mm. 



Locality: Nome, Alaska, August 21, 1916 (F. Johansen). One female. 



CHIRONOMID^. 



There are a number of specimens, representing several species, in the collec- 

 tion, bnt their condition is very bad so that specific identification is not j)ossible 

 except in a few cases. A number of larvae and pupae in alcohol lend themselves 

 more readily to description and to generic classification than do the imagines, 

 but so little is known of the immature stages of the many species occurring in 

 the Arctic regions that it is impossible to give specific identifications for the 

 specimens in this collection. 



TANYPINy^. 



There are two species of this subfamily in the collection, neither of which is 

 in very good condition. They apparently represent distinct genera. 



Tanypus Meigen. 



There is one species of this genus in the collection, some specimens of which 

 are in sufficiently good condition to assure their identification. 



The larvae of this genus are met wijth in both swiftly flowing streams and in 

 standing water, such as lakes and pools, or even in water-barrels or other tem- 

 porary receptacles. 



Tanypus alaskensis, n. sp. 



Male.— Black, subopaque. Legs fuscous. Wings slightly greyish; cross- 

 vein infuscated, but not broadly so. Halteres brown. Plumes of antennae 

 and hairs of body and legs fuscous. 



Palpi long, antepenultimate joint distinctly longer than penultimate, the 

 latter longer than ultimate. Dorsum of thorax with numerous long hairs in the 



Vol. iii— 46963— 3J 



