66 c Canadian Arctic Expedition, 1913-18 
This species differs from any I have seen from North America, but owing 
to the very close resemblance between species of this genus and the poor state 
of preservation of the specimen I do not consider it advisable to give it a name. 
Litnnophora, sp. 2. 
A female taken on Herschel island, Yukon Territory, July 29, 1916 (F. 
Johansen), differs from the foregoing in having four pairs of postsutural dorso- 
centrals, the acrostichals two-rowed, dorsum of thorax distinctly trivittate, 
mid tibia with two antero-dorsal and three postero-dorsal bristles, hind tibia 
with one antero-ventral, two antero-dorsal, and two postero-dorsal bristles, 
and the last section of fourth vein comparatively longer. 
Length, 4-75 mm. 
Pogonomyia Rondani. 
This genus has much in common with Trichopticus. In fact it is difficult 
to separate the males of some species from those of Phaonia and Trichopticus. 
The male of Pogonomyia nitens Stein was described as a Spilogaster, though 
the author of that description recognized the female as a Pogonomyia — an 
error which led me into describing the species in that genus under the name 
Pogonojnyia flavinervis. 
The characters which are of service in separating Pogonomyia from Tri- 
chopticus are summarized as follows: — 
Male. — Eyes bare; prealar bristle long; fore tarsi short and with erect 
short pile ventrally, the other tarsi spinose ventrally; hind tibiae not curved, 
with long and short bristles, without fine hairs; hind coxse bare above at apices. 
Femalii. — Differs from the male by the widely separated eyes; in other 
respects similar, but with the lower supraorbital bristle directed forward and 
with cruciate frontal bristles, characters which separate the genus from both 
Phaonia and Aricia. 
There is one species in the collection, represented by one female, which 
lacks the abdomen but is otherwise in good condition. The species resembles 
alpicola Rondani, a European species reported as occurring in North America. 
Pogonomyia quadrisetosa, n. sp. 
Female. — Black, shining. Orbits, ptilinum, and upper portion of cheeks 
silvery pilose, face and lower portion of cheeks less distinctly silvery. Dorsum 
of thorax slightly greyish brown pruinescent, with three poorly defined vittae 
anteriorly. Abdomen missing. Legs black. Wings clear, veins yellowish 
except costa and base of first. Calyptrae whitish yellow. Halteres black. 
Cruciate frontal bristles strong; orbitals as in nitens Stein, except that 
the weak hairs are more numerous; orbits in profile projecting as far beyond 
eye as half the length of eye — much farther than in nitens: anterior angle of 
cheeks protruding farther than frons at base of antennae; third antennal joint 
slightly longer than second; arista microscopically pubescent; vibrissa very 
little stronger than the other bristles, the latter covering a larger area than in 
nitens; palpi much shorter than in nitens. Thorax with presutural acrostichals 
weak, irregularly two or three-rowed; postsutrual dorso-centrals four in number 
rather weak; prescutellars as strong as dorso-centrals; pteropleura in type 
with a long hair near middle. Fore tibia with three to four bristles on apical 
half of postero-ventral surface; mid femora with a series of long bristles on. 
antero-ventral surface; mid tibia with three to four antero-ventral, four to 
five antero-dorsal, five to six postero-dorsal bristles, and three to four 
l^ostero-ventral bristles; hind femora with a series of long bristles on antero- 
ventral surface; hind tibia with five to seven long bristles on antero-ventral,, 
antero-dorsal, and postero-dorsal surfaces. Venation as in nitens. 
Length, 6-7 mm. 
