Diptera 83 c 



so stout and with much weaker and more widely spaced bristles; mid tibae 

 in both sexes with one to four strong antero-dorsal bristles and three to five 

 irregularly placed unequal-sized posterior bristles; hind tibia of male slightly 

 curved, with a very pronounced apical callosity on ventral surface, the entire 

 ventral surface with dense, short, erect hairs: hind tibia of female without a 

 pronounced apical callosity and with much less distinct ventral hairs. Costal 

 spines long and widely spaced; last section of fourth vein about I -5 as long as 

 preceding section. 



Length, 5-7 mm. 



Type locality: Bernard harbour, Dolphin and Union strait, Northwest 

 Territories, July 10, 1916 (F. Johansen). Paratypes, same locality as type, 

 August 1-7 and 14, 1915, and September, 1915 (F. Johansen). Thirty-five 

 specimens. 



Differs from fenestralis Fallen, in being much larger and, in the male, 

 in having the hind tibse with a very decided apical production or callosity, and 

 in both sexes in having the cross-veins not infuscated. 



Leria Robineau-Desvoidy. 

 Represented by one species in the collection. 



Leria fraterna (Loew). 



Scoliocenlm fraterna Loew. Berl. Ent. Zeitschr., 1863, p. 27. 



A male specimen, with data as follows: Nome, Alaska, August 24, 26, 1916 

 (F. Johansen). 



This species has previously been recorded from Alaska, and is generally 

 distributed in the United States and Canada. 



Neoleria, n. gen. 



Generic Characters. 



Similar to Leria, differing in having only two pairs of well-developed, 

 postsutural; dorso-central, thoracic bristles. 

 Genotype: Neoleria rotundicornis, n. sp. 



Neoleria rotundicornis, n. sp. 



Male. — Reddish testaceous, subopaque, upper portion of frons, occiput, 

 dorsum of thorax except humeri and scutellum, greater pott ion of pleura', and 

 abdomen except the hypopygium, fuscous, with grey pruinescence. Wings 

 faintly yellowish, veins pale brown. 



Frons less than one-half the head-width, orbits differentiated, each with 

 two strong bristles and a few short setulae, interfrontalia with short setulae; 

 antennae large, third joint almost orbicular, second very small; arista about 

 as long as length of frons, with a short swelling &i base, apical part not as slender 

 as in Oecothea, with microscopic pubescence; eyes almost round, of moderate 

 size; face almost perpendicular; cheek about half as high as eye, with a few 

 short marginal bristles and one long vibrissa; proboscis stout: palpi normal. 

 Dorsum of thorax with numerous moderately long setulose hairs and two pairs 

 of postsutural, dorso-central bristles: scutellum short and broad, rounded in 

 outline and subconvex on disc, bare except for the four marginal bristles: pro- 

 pleural bristle strong; mesopleura bare except for a tew setulae on anterior 

 lower angle; sternopleura with one strong bristle and a few setulose hair-: 

 pteropleura and hypopleura bare. Abdomen with short setulae and a few 



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