Diptera 67 c 
Type locality: West of Bernard harbour, Dolphin and Union straits, 
Northwest Territories, July 14, 1916 (F. Johansen). 
The type specimen differs from any previously described species of the 
genus in having four postsutural dorso-centrals. If the specimen is abnormal 
in this respect it can be separated from nitens by the presence of the long bri.Nles 
on the antero-ventral surface of the mid femora; from the species identified by 
Stein as alpicola Rondani, by the yellowish wings, almost bare arista, and I he 
mid-femoral bristles. 
A third species which occurs in the United States, and which resembles 
alpicola, is separable from quadrisefosa by the more loosely pilose fore tarsi, the 
more widely spaced and longer bristles on latero-ventral margins of the mid 
and hind tarsi, the darker wings, and the shorter papli, the latter being less than 
half as long as the apical portion of the proboscis. 
A fifth, and probably a sixth species, found in Colorado, are very distinct 
from quadn'setosa. 
Pogonomyioides, n. gen. 
Generic Characters. 
Female. — Resembles Pogonomyia, differing principally . i the prealar 
Ijristle being weak or absent and in having the pteropleura with a number of 
long hairs on centre. The only species of Pogonomyia in which I have seen 
any hairs on the pteropleura is the one described in this paper. In addition to 
the above characters the intra-alar bristles are practically aV)sent in Pogonomy- 
ioides, usually only the posterior one being distinguishable and that very 
weak, and there is no long bristle at apex of fore tibia on venter, nor are there 
any conspicuous bristles at apices of fore tarsal joints ventrally. 
In other respects as Pogonomyia. 
Type, Pogonomyioides atrata, n. sp. 
Pogonomyioides atrata, n. sp. 
Female. — Puparium: Brownish red, slightly shining. Surface microscopic- 
ally granulose, almost without strise above, finely Init very distinctly transversely 
striate ventrally, becoming more coarsely so posteriorly. Posterior portion of 
cephalopharyngeal skeleton very slender, as shown in PL IX, fig. 30; dorsal 
half of thoracic segments absent; apex with a concentrically ridged rim sur- 
rounding a small but deep cavity; locomotor processes apparently lacking, 
except in center of each ventral segment, where there is a single transverse 
series of microscopic elevations extending nearly across the segments; a single 
series of small, stitch-like impressions between all segments, which is duplicated 
and surrounds the lateral fusiform area, three or four, short, irregular, longitudinal 
series of minute elevations on each segment laterally; base of abdomen with 
the pair of respiratory tubercles well developed, slender, about six times as 
long as thick at base; apical segment irregularly shrunken (possibly abnormal), 
a large depression caudad of spiracles and extending forward to posterior margin 
of penvdtimate segment, a subtriangular depression situated in extreme apex, 
and a large one on lateral area; spiracles slightly elevated, separated by less 
than three times their own diameter, the openings directed dorsad, ventrad, 
and laterad respectively. 
Length, 6-5 mm. 
Imago: Black, slightly shining. Orbits and upper part of cheeks silvery 
pilose. Thorax with slight greyish pruinescence, -distinctly but not conspicu- 
ously c^uadrivittate. Abdomen slightly and evenly grey pruinose. Wings clear. 
Calyptree yellowish. Halteres black. 
Frons about two-fifths the width of head, each orbit above about one-fifth 
as wide as interfrontalia; interfrontal cruciate ])ristles strong; orl)itals as in 
Vol. iii— 46963— 5^ 
