Diptera i 3 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 ihterfrontalia, 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, bu1 

 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 vittae, 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 noticcably 

 paler than others; costal thorn of moderate length. 



Length, 5 mm. 



Type locality: West 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 substn'ata 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. 



Locality: Bernard harbour, Dolphin and Union 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. 



