Vol. XI] MALLOCH— PRIBILOF ISLANDS DIPTERA 181 



Holotype, male, No. 815, and allotype, female, No. 816, Mus. 

 Calif. Acad. Sci. ; also one male and three female paratypes, all 

 collected by G. Dallas Hanna, July 12, 1920. 



Type locality, St. Paul Island, Alaska. 



This species will run down to nobilis Stein, in a key to the 

 species of this genus which I have submitted for publication in 

 the "Canadian Entomologist." It differs from that species in 

 having the thorax distinctly vittate, the abdominal spots separated, 

 and the vibrissal angle very distinctly produced. 



5. Melanochelia spinicosta Malloch, new species 



Female : Length 6-5 mm. Similar to the preceding species 

 in color; the cross-veins of the wings distinctly but inconspicu- 

 ously infuscated ; halteres yellow. 



Frons opaque, over one-third of the head-width ; parafacial 

 at base of antennae wider than third antennal segment ; face con- 

 cave in profile, vibrissal angle almost in line with base of antennas ; 

 cheek nearly twice as high as width of parafacial ; arista with 

 short pubescence. Thorax with three pairs of postsutural dorso- 

 centrals. Abdomen with apical genital segment armed with 

 about 12 short thorns. Hind femur with four or five bristles on 

 apical half of anteroventral surface, posteroventral surface with 

 a few fine bristles on basal half; hind tibia with bristles as in 

 preceding species. Wing-veins 3 and 4 slightly convergent 

 apically; costa with long bristles almost to apex of second vein, 

 those at and near apex of first vein about three times as long as 

 diameter of costal vein. 



Distinguished from any species known to me by the spinose 

 genitalia and the long bristles on costal vein. 



Holotype, female, No. 817, Mus. Calif. Acad. Sci. ; collected 

 by G. Dallas Hanna, August 10, 1920. 



Type locality, St. Paul Island, Alaska. 



6. Melanochelia hirticauda Malloch, new species 



Male : Length 5-6 mm. Deep black, subopaque. Orbits, para- 

 facials and cheeks white pruinescent. Thorax not vittate. Ab- 

 domen unmarked. Wings infuscated. Calyptraa grayish white. 

 Knobs of halteres fuscous. 



Eyes bare, separated at narrowest part of frons by a distance 

 a little greater than width across posterior ocelli ; orbits narrower 

 than interfrontalia, setulose to anterior ocellus ; parafacial at 



