48 c Canadian Arctic Expedition, 1913-18 



Eyes widely separated; third antennal joint conical, about 2-5 times as long- 

 as its basal width; style slightly over one-third as long as third antennal joint; 

 proboscis fully twice as long as height of head. Hairs on thorax long and soft, 

 the acrostichal series in two to three irregular rows; plate on venter between 

 fore coxae long-haired; scutellum with four bristles. Abdomen rather acutely 

 pointed apically. Legs very slender; femora with very short surface hairs; fore 

 tibiae without differentiated bristles; mid and hind tibiae with a few short bristles 

 on dorsal surfaces which are not as long as the diameter of the tibiae; tarsi 

 slender, all joints with stiff black setulae ventrally, and a few differentiated 

 setulae on dorsum of at least the basal joint. Wing venation normal; the vein 

 closing lower portion of apex of discal cell very oblique, almost straight; sixth 

 vein thick to apex, extending to margin of wing. 



Length, 7 mm. 



Localities: Herschel island, Yukon Territory, July 29, 1916; Cockburn 

 point, Dolphin and Union strait, Northwest Territories, September 3, 1914 

 (F. Johansen). 



Rhamphomyia conservativa, n. sp. 



Male. Black, subopaque. Wings brownish, more distinctly so basally. 

 Halteres yellowish. Hairs and bristles black. 



Eyes contiguous; third antennal joint nearly three times as long as its 

 width at base; style stout, rather more than one-third as long as third antennal 

 joint; proboscis about 1-25 as long as height of head. Dorsum of mesonotum 

 rather densely hairy, the hairs upright, slender, and of moderate length; ventral 

 plate between bases of fore coxae bare; hairs in front of base of halteres long and 

 dense; scutellum with eight to twelve fine hairs on posterior margin. Abodmen 

 with rather sparse short hairs, which are longer near posterior margins of segments; 

 hypopygium of the same general typeas that of erinacioides, but the portion that 

 is directed cephalad over dorsum reaches about three-fourths of the way to base 

 and is pale yellow in colour, contrasting strikingly with the dark abdomen; 

 lower posterior angle of hypopygium produced caudad in the form of a short 

 subtriangular process; hypopygial filament very thick for a short distance at 

 base, then becoming abruptly setiform, hidden for the greater portion of its 

 length. Legs slender, femora with a number of very short setulae on ventral 

 surfaces, which are confined to basal third on hind pair; apical two-thirds of 

 hind femora and the whole of hind tibiae ventrally with very dense microscopic 

 pile, intermixed on the tibiae with short erect spinules; basal joint of hind tarsus 

 nearly as long as the next four joints combined, the entire tarsus much shorter 

 than tibia; dorsum of tibiae and tarsi with short setulae; tarsal claws very much 

 curved, sickle-shaped, of good size. Venation as in previous species except that 

 the vein closing lower portion of discal cell is distinctly curved. 



Female. Similar in colour to the male, the wings more distinctly brownish. 



Eyes separated by nearly twice the width across posterior ocelli. Dorsum 

 of mesonotum with fewer and shorter hairs than in the male, the anterior 

 acrostichals four to six-rowed. Abdomen pointed at apex. Legs more setulose 

 than those of the male, the hind femora with setulose hairs on their entire ventral 

 surface; ventral surface of hind tibiae with short regular setulae instead of erect 

 pile; basal joint of hind tarsus longer than next four combined; tarsal claws 

 much shorter than in male. Wings broader than in male, the venation similar, 

 but vein closing lower portion of apex of discal cell less curved. 



Length, 6-5-7-3 mm. 



Type locality: West of Bernard harbour, Dolphin and Union strait, North- 

 west Territories, July 14, 1916. Paratypes, Herschel island, Yukon Territory, 

 July 29, 1916; Bernard harbour, Northwest Territories, July 10, 18, 19, and 

 August 1-7, 1915; Young point, Northwest Territories, July 18, 1916 (F. Johan- 

 sen). Nine specimens. 



