82 c Canadian Arctic Expedition, 1913-18 



HELOMYZID^E. 



The larvip of this family live in carrion and manure. Some of the species 

 a iv found in caves and in underground nests of rodents. 



The family is represented in this collection by imagines only. In order to 

 facilitate the indent ificat ion of the genera in this paper a generic synopsis is 

 given herewith. 



KKV TO 



1 . Humeral bristle present ......................................................... 2 



Humeral brist le absent ......................................................... ^ 



2. Thorax with live dorso-centrals ...................................... Ihiotnijza Loew. 



Thorax with two dorso-centrals ................................ AdhtietomUS ( Y>quilleU . 



3. Thorax with one pair of tlorso-centrals ........................... J'orxciitix Darlington. 



Thorax with at least two pairs of dorso-centrals .................................. 4 



4. Mid tibia 4 with long bristles on middle ........................ ^. ..... Occothea Haliday. 



Mid tibia- without bristles except, at apex ........................................ 5 



5. Thorax witli five or more pairs of dorso-centrals .................................. 6 



Thorax with two pairs of dorso-centrals ................................ Neoleria, gen. n. 



Thorax with three pairs of dorso-centrals ......................... TephrochUwnys Loew. 



Thorax \vith four pairs of dorso-centrals .......................................... 8 



(i. Scutellum with six bristles; inner cross-vein much before end of first vein; mesopleura 



ban- ................................................. Anorostomoides Malloch. 



Scutellum with four bristles ..................................................... 7 



7. Inner cross-vein distinctly before end of first vein; frons in male very narrow; propleural 



and mesopleural bristles present ............................... Hc/cronii/za Fallen. 



Inner cross-vein at or beyond end of first vein; propleural and mesopleural bristles 



absent ; eyes of male widely separated ............................ Allopltijla Loew. 



8. Eyes very small, not much larger than antennae; arista remarkably long; vibrissae 



strong ..................................................... Eccoptomera Loew. 



Eyes much larger than antennae; arista short; vibrissae short and weak; face receding, 



oral margin not developed. . .................................. Anorostoma Loew. 



Eyes large; arista long; vibrissse strong; mouth margin well developed ....... Leria Loew. 



Oecothea Haliday. 



There is a large series of a species of this genus in the collection. I cannot 

 identify it with any of the previously described European species and it differs 

 essentially from fenestralis Fallen a species occurring in Europe and North 

 America. 



Oecothea aristata, n. sp. 



MALE AND FEMALE. Head, anterior lateral angles of thorax, greater portion 

 of srutelluin, hypopygium of male, genital segments of female, and the legs 

 reddish testaceous; upper portion of head and greater portion of occiput, thorax 

 abdomen, coxae, sometimes median portion of femora, and whole of tarsi fuscous. 

 AVings yellowish, cross-veins not infuscated. 



Frons about two-thirds the width of head, orbits with one brislle near 

 middle; Lnterfrontalia with sparse, short hairs; antenna' small, third joint barely 

 longer than second; arista very slender, nearly bare, about 2-5 as long as head, 

 with a Very short swelling at base; face with a broad central carina which is 

 flattened and broadened below, covering the entire centre of face, cheeks with 

 one strong vibrissa and a number of short- setuhe; eye about equal in height 

 to cheek at posterior margin. Three pairs of postsuturals present; propletira 

 with one bristle; a few short setula? below anterior spiracle; mesopleura with 

 or without a short bristle; sternopleura with out' long bristle and a number of 

 short setiihe; pteropleura bare; hypopleura with a number of minute 1 setulae 

 below spiracle; scutellum ban- m disc, margin with four bristles. Abdomen 

 of male <nbr\Tndrcal, fifth sternite with short, stubby setulse on apical half; 

 bypopygium large, knob-like; abdomen of female more flattened, genital 

 segments small. All femora of male slightly thickened, their antero- and postero- 

 ventral surfaces each will) a aeries of short black bristles; femora of female not 



