Diptera 79 c 
Frons over one-half the width of head, orbits narrowed anteriorly; arista 
much swollen on basal fifth of third joint, microscopically pubescent; palpi 
slightly dilated, Aveakly bristled. Thorax without presutural acrostichals; dorso- 
centrals weak. Scutellum with two apical bristles. Abdomen somewhat 
incrassated apically, the hypopygium large, forceps long, curved forward, rather 
slender. Legs normal, so placed in type that it is not possible to say definitely 
what the arrangement of the bristles is, but the}" are weak and not numerous, the 
fore tibia lacking them on posterior surface. Wings extending beyond apex of 
abdomen, inner cross-vein slightly bej^ond apex of first vein and almost exactly 
at middle of discal cell; penultimate section of fourth vein three-fifths as long as 
ultimate section. 
Length, 4 mm. 
Type Localitv: Bernard harbour, Dolphin and Union strait, Northwest 
Territories, July 18-19, 1915 (F. Johansen). 
This species agrees better with Cordylurella than with any other in the 
appended key to genera though with better material and both sexes available it 
may be necessary to separate it generically from nebulosa. The latter is readilj^ 
distinguished from subvittata by its densely pruinose thorax, more strongly 
spined legs, the antero-dorsal bristles on the femora being noticeably stronger and 
more numerous, and the presence of a strong posterior bristle on the fore tibia. 
The scutellum in nehulosa has four bristles. 
Dasypleuron, n. gen. 
Generic Characters. 
Head in type-species so badly crushed that it is not possible to give full 
description; in general it appears to resemble that of Cordylurella but the 
antennae are not visible owing to the face being crushed in, the apical portion of 
one arista, which is distinctly pubescent, alone being visible. The thorax has the 
same chsetotaxy as Cordylura latifrons Loew., but the pteropleura has a 
number of long soft hairs on the middle. Abdomen short and stout, hypopygium 
occupying over half of the ventral surface, the forceps chitinized and stout, 
similar to, but larger than, those of Cordylurello, suhvittata. Legs normal. First 
wing-vein bristly on apical portion; sixth vein incomplete. 
Genotype: Dasypleuron tibialis, n. sp. 
Dasypleuron tibialis, n. sp. 
Male, — Glossy black. Head black; frons brownish red, orbits and triangle 
black, slightly grey pruinose; palpi black; proboscis glossy black. Thorax 
slightly pruinose on dorsum, not vittate. Abdomen entirely glossy. Legs 
black; apices of fore femora, and all tibise reddish yellow, the mid and hind pair 
darker apically. Wings clear, veins black. Halteres black. Bristles black, 
hairs fuscous, those on ventral surfaces of femora paler. 
Orbital bristles long and slender; palpi spindle-shaped, with rather weak 
bristles; proboscis normal. Dorsum of thorax with numerous long setulose 
hairs on front margin laterally, and laterad of presutural dorso-centrals; 
presutural acrostichals strong; anterior postsutural dorso-central duplicated 
in type so that there appears to be two strong and two weak post-suturals; 
scutellum with four subequal bristles; hairs on pleurae long; prothoracic 
and stigmatal bristles long and slender; almost entire surface of mesopleura 
hairy. Abdomen with rather long hairs, basal hypopygial segment with a 
number of strong bristles; apical visible ventral segment armed with long 
hairs. Legs normal; femora with long hairs on the ventral and anterior surfaces, 
those on anterior surface of mid pair and antero-ventral surface of hind pair 
bristle-like; fore and hind tibise apparently without bristles, mid pair with one 
