Crane-flies 5 c 
iFemale. — Length, 5-5 mm.; wing, 6-8 mm. 
Rostrum and palpi black. Antennse black, the basal flagellar segments 
enlarged, beyond the fifth oval, the last segment elongate. Head dark-coloured, 
discoloured in the type. 
Thorax dark-coloured, discoloured in the type, probably grey pruinose; 
pleura grey pruinose. Halteres short, pale at the base, the remainder brown. 
Legs with the coxae and trochanters yellow; femora dull yellow, the tips broadly 
brown, narrowest on the fore femora, broader on the posterior femora; tibise 
and tarsi very light brown, the terminal segments of the latter darkened. Wings 
nearly hyaline; stigma large, oval, brown; veins brown; venation (PI. I, fig. 1) 
Sc2 remote from the tip of Sci so that Sci alone is about equal to the basal 
deflexion of Cth; Sci ends just opposite the origin of Rs ; r at the tip of Ri] 
Rs about twice as long as the basal deflexion of J^4+5; cell ^irs^ M2 closed; basal 
deflexion of Cui at the fork of M. 
Abdomen dark brown, pruinose, the pleural integument and the valves of 
the ovipositor yellowish. 
Locality: Holotype, 9, Nome, Alaska, August 24, 25, 1916 (F. Johansen). 
No. 78. 
In the elongate Sci this species suggests D. halterata Osten-Sacken, but 
this is about the only feature that the two species have in common. In other 
respects it seems closer to D. aquita Dietz^ from Taltson river, Mackenzie dis- 
trict (not Rocker river as stated in the original description), but it is a much 
smaller fly and the details of both colour and venation are different. 
Tribe ERIOPTERINL 
Genus Erioptera Meigen. 
Subgenus Erioptera Meigen. 
Erioptera Meigen; Illiger's Magazine, vol. 2, p. 262; 1803. 
Erioptera (Erioptera) angustipennis, n. sp. 
General colouration dark brown with a grey pruinosity; wings very long 
and narrow. 
Male. — Length, 4-4 mm.; wing, 5-4 mm. 
Rostrum and palpi black. Antenna black, the flagellar segments oval. 
Head dark grey. 
Mesonotum brown, more greyish on the sides; pseudosutural foveis con- 
spicuous, transverse, black. Pleura dull grey. Halteres rather elongate, brown. 
Legs dark brownish black throughout. Wings very long and narrow showing 
the first stages of atrophy although the venation is normal; membrane slightly 
suffused with brown; stigma indistinct; veins dark brown; venation (PI. I, fig. 2) 
the veins are all very elongated due to the great narrowing of the wing. 
Abdomen dull grey, the segments indistinctly paler caudally and here 
with fringes of long golden hairs that are more sparse elsewhere on the surface; 
male hypopygium with the pleural appendages slender, pointed at their tips. 
LocaUty: Holotype, cf, Bernard harbour. Dolphin and Union strait, North- 
west Territories, August 1-7, 1915 (F. Johansen). No. 1045. 
Readily distinguished from all other members of the genus by the long, 
narrow wings. The second arial vein is straight as in the subgenus Acyphona 
to which group the species may perhaps be better referred. 
1 Canadian Entomologist, vol. 47, pp. 331-332, fig., October, 1915. 
