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, weakly 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 typ6 that it is not possible to say definitely 

 what the arrangement of the bristles is, but they are weak and- not numerous, the 

 fore tibia lacking them on posterior surface. Wings extending beyond apex of 

 abdomen, inner cross-vein slightly beyond 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 Locality: 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 readily 

 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 stropg posterior bristle on the fore tibia. 

 The scutellum in nebulosa has four bristles. 



Dasypleuron, ji. 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 Cordylurella subvittata. 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 tibiae 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, basat 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-hke; fore and hind tibiae apparently without bristles, mid pair with one 



