Diptera 73 c 
Phorbia Robineau-Desvoidy. 
There are apparently four species of this genus in the collection, none o 
which are in good condition, 
Phorbia brevitarsata, n. sp. 
Male. — Black. Anterior portion of interfrontalia, facial orbits, and the 
greater portion of cheeks rufous. Wings clear. Calyptra yellow. Halteres yellow. 
Eyes separated at narrowest part of frons by a distance more than equal 
to width across posterior ocelli; cruciate bristles long and hair-like; antennae 
short, third joint 1-5 as long as second; arista much swollen at base, tapered 
to near apex of basal third, almost bare; facial orbit in profile nearly as broad 
as height of cheek, the latter one-third as high as eye; vibrissal angle weak, 
almost on a level with lower margin of eye, the portion ventrad of it nearly verti- 
cal; cheek with a few weak marginal hairs. Prealar bristle very short; three to 
four pairs of weak acrostichals in front of suture. Abdomen subcylindrical, but 
little tapered posteriorly. Legs rather short and stout; mid tibia with one to 
two bristles on antero-dorsal and postero-dorsal surfaces; hind femur with an 
almost complete series of widely spaced bristles on antero-ventral surface and 
a number of similarly disposed bristles on basal half of postero-ventral surface; 
hind tibia with long slender bristles on antero-ventral, antero-dorsal, and postero- 
dorsal and postero-ventral surfaces, those on the dorsal surfaces stronger, more 
irregular, and more widely spaced than those on ventral surfaces, the postero- 
ventral surface with the bristles very fine and hair-like and in a double series 
on basal half; hind tarsus distinctly shorter than hind tibia, the basal joint 
less than one-third the tibial length. Outer cross-vein of wing oblique; last 
section of fourth vein about 1 • 5 as long as preceding section. 
Female.— Similar to the male in colour. 
Interfrontalia not much wider than orbit; cruciate bristles long and strong; 
two bristles proximad of anterior supraorbital; facial orbit in profile nearly 
as wide as height of cheek, the latter half as high as eye. Thorax showing traces 
of pollinose vittse, a slender one on each side of anterior acrostichals. Abdomen 
tapered posteriorly; apex of last genital segment with numerous short stout 
bristles. Fore tibia with one posterior and one antero-dorsal bristle; hind 
tibia with fewer hair-like bristles on ventral surfaces than male, those on postero- 
ventral surface confined to basal half. Costal and radial veins noticeably 
paler than others; costal thorn of moderate length. 
Length, 5 mm. 
Type locality: ^Yest of Konganevik, Camden bay, Alaska, July 4, 1914, 
and June 1914 (F. Johansen). 
The much-protruded face, pale colour of orbits and cheeks, and armature 
of the hind tibia of male separates this species from any known to me. 
Phorbia, sp. 1. 
This species closely resembles suhstriata Stein, but differs in having the 
facial orbits in profile about as wide as height of cheek, the presutural acrostichals 
more numerous and much weaker. None of the specimens are in good enough 
condition to ensure accurate identification. 
Localitv: Bernard harbour, Dolphin and L'nion strait. Northwest Terri- 
tories, July 18-19, 1915, and July 1916 (F. Johansen). 
Two males and three females. 
Phorbia, sp. 2. 
Closely resembling the preceding species. Differs in having the frons 
entirely black, the wings less conspicuously yellow at base, and the costal 
thorn much shorter. 
