78 c Canadian Arctic Expedition, 1913-18 
Frons about half the width of head, each orbit nearly half as wide as inter- 
frontalia; lower supraorbital bristle directed forward, the upper two slightly 
backward; antennae large, third joint broad, its width over half that of eye, 
apex not acute, entire length on inner side nearly four times that of second; 
arista microscopically pubescent, second joint about one-fourth as long as 
third, the latter swollen on its basal two-fifths; profile as in PI. X, fig. 34; 
hairs of lower part of occiput mostly white. Dorsum of thorax wdth two-f- 
three dorso-centrals; acrostichals irregularly two-rowed before suture; discal 
setulse sparse and long; scutellum with four long bristles and a number of long 
setulose discal hairs; sternopleura with two long posterior bristles placed verti- 
cally and many long strong hairs; prothoracic and stigmatal bristles strong. 
Abdomen with numerous long hairs, those on posterior margins strong but not 
macrochaetse. Legs normal; fore tibia with two antero-dorsal, two postero- 
dorsal, and one posterior bristle; mid tibia with one ventral, two antero-dorsal, 
two postero-dorsal, and one posterior bristles; hind tibia with one large and 
one to two small antero-ventral, three antero-dorsal, and four to five postero- 
dorsal bristles. Costa with fine setulse and more widely spaced spinules; outer 
cross vein straight, situated at nearly its own length from end of fifth vein, 
last section of fourth vein nearly twice as long as preceding section. 
Length, 5-5 mm. 
Type locality: Bernard harbour and cape Krusenstern, Dolphin and LTnion 
strait. Northwest Territories, July 3, 1916 (F. Johansen). 
I have seen a specimen which I consider belongs to (Jonatherus pkmiceps 
Fallen, Ihe genotype, in another collection from Alaska. From atricornis it 
differs in having the palpi entirely whitish, the legs paler, the wings conspicuously 
brown along costa and on each side of longitudinal and cross-veins, ancl in being 
much less strongly bristled, the acrostichals in front of suture being less numerous 
and Aveaker. The two species are very closely related but in my opinion readily 
separable by the characters indicated herein. 
Cordylurella, n. gen. 
Generic Characters. 
Female. — Head, viewed from above, suVjspherical, slightly flattened 
posteriorly; frons one-third or more than one-third the head-width; orbits 
differentiated; the bristles well developed, similar to those of Cordylura; antennae 
slightly shorter than face, third joint rounded apically, arista pubescent; palpi 
without strong apical bristle. Thoracic chactotaxy as in Cordylura. First 
wing-vein bare; sixth not reaching margin of wing. Legs similar to those of 
Corchjlura. 
Genotype: Cordylura nehulosa CoquiWeti. 
There is a male specimen of a species which I refer to this genus in the 
collection. I can not identify it as any previously described species, and describe 
it herewith as new. 
Cordylurella subvittata, n. sp. 
Male. — Black, glossy. Head yellow; occiput, ocellar triangle, and greater 
portion of frontal orbits glossy black, the orints and triangle slightly pollinose; 
face and checks with distinct white pruinescence; antenna? yellow; arista black; 
palpi yellow; proboscis yellow at base, becoming brown at apex. Thorax glossy 
black, lateral margins, a narrow line along course of dorso-centrals, and a broad 
central vitta covered with very short grey pile, giving the dorsum a subvittate 
appearance. Abdomen glossy l)lack; surface with long but not dense yellow 
hairs, bristles on penultimate dorsal segment black; hypopygial forceps yellow 
except at base. Legs yellow, mid and hind coxse brown. Wings clear, veins 
])rown. Halteres brown. 
