[45 J ] DIPTERA 65 



Hylemyia fabricii (Holmgren). 



Aricia fabricii HOLMGREN, Ofversigt Vetan.-Akad. Forh., p. 101, 1872. 



Kukak Bay, July 4 ; Popof Island, Alaska, July 9 to 1 1 : Thirteen 

 specimens of both sexes. Originally described from Greenland, and 

 the U. S. National Museum contains a male specimen collected at 

 Franconia, New Hampshire, by Mrs. Annie T. Slosson. The two 

 long ribbon-like appendages of the hypopygium are visible only when 

 the hypopygium is disengaged. 



Pegomyia costalis Stein. 



Pegomyia costalis STEIN, Berliner Ent. Zeitsch., p. 243, 1898. 



Kukak Bay, July 4; Saldovia, Alaska, July 21 : Two specimens. 

 The type locality of this species is South Dakota. 



Phorbia pretiosa (Walker) . 



Ariphia pretiosa WALKER, List Dipt. Ins. British Museum, iv, p. 965, 1849. 

 Lowe Inlet, British Columbia, June 3 ; Sitka, June 16; Yakutat, 

 June 21 ; Juneau, Alaska, July 25: Ten specimens. Originally 

 described from the Albany River, British America. 



Phorbia biciliata sp. nov. 



Male : Black, the halteres yellow, lower part of front yellowish 

 brown ; frontal orbits unusually broad, contiguous for a considerable 

 distance, only three or four pairs of very short front bristles, the 

 ocellar bristles not longer than the adjoining hairs, antennae three- 

 fourths as long as the face, the third joint scarcely one and one-half 

 times as long as the second, arista with a very short pubescence, pro- 

 boscis rather slender, labella small ; thorax, scutellum, and abdomen 

 whitish pruinose, unmarked, abdomen depressed, very elongate oval, 

 hairs of venter sparse and of nearly a uniform length, hypopygium 

 unusually large, its two segments together much longer than the pre- 

 ceding segment, the two lamellae of the fifth ventral segment very 

 large, each bearing a row of about four short spines at the apex ; front 

 tibiae each bearing a bristle near middle of the posterior side, the 

 bristle at apex of inner side slender and sharp pointed ; middle femora 

 ciliate on the anterior-under and posterior-under sides with rather 

 short bristles, middle tibiae each bearing two bristles on the median 

 third of the outer-posterior side and with one below middle of the 

 inner-posterior side; hind femora ciliate on the anterior-under and 

 posterior-under sides with bristles which are very short on the bases 

 of the femora but gradually become rather long toward the apices ; 

 hind tibiae ciliate with rather short bristles along the entire length of 



