J. R, MALLOCH 273 



lower margin; third antennal segment broad, not twice as long as second, its 

 apex almost at mouth-margin; arista with very short pubescence, the longest 

 hairs not longer than its basal diameter; palpi slightly broadened apicall.v. 

 Thorax with two or three pairs of short setulose presutural acrostichals, between 

 which there are some hairs; postsutural dorsocentrals four; prelar short but 

 distinct; hypopleura bare. Basal tergite bare. Fore tibia with a median 

 posterior bristle; fore tarsus slender, longer than tibia, without long sensory 

 hairs along posterior side of basal segment; mid femur with a fine bristle at 

 base on ventral surface; mid tibia with two posterodorsal and one posterior 

 or posteroventral bristle; hind femur with two or three preapical bristles on 

 anteroventral surface; hind tibia with one anterodorsal and two anteroventral 

 bristles. Last two sections of fourth vein subequal. 

 Length, 5.5 mm. 



Type and three paratypes. — Muir's Inlet, Alaska, June 12, 

 1899, (T. Kincaid, Harriman Alaska Expedition). Paratypes, 

 one female, Anchorage, Alaska, July 22, 1921; one female, 

 Hurricane, Alaska, July 15 1921, and two females, Camp 297 of 

 Alaska Engineers' Commission, 12 miles north of Hurricane, 

 Alaska, July 14, 1921, (J. M. Aldrich). All in U. S. N. M. 



Phaonia subfusca new species 



Male and female. — Black, subopaque, densely gray pruinescent. Basal 

 two segments of antennae and base of third, palpi, and the lower and anterior 

 part of cheeks reddish yellow. Thorax inconspicuouslj- quadrivittate. Ab- 

 domen with a linear black dorsocentral vitta. Legs fuscous, apices of femora 

 and all of tibiae reddish yellow. Wings clear, cross -veins not noticeabl.y in- 

 fuscated. Calyptrae yellowish white. Halteres yellow. 



Male. — E3'es almost bare, separated by a distance about equal to twice the 

 M'idth of third antennal segment; orbits narrow, setulose nearly to anterior 

 ocellus; interfrontalia not interrupted; profile as in figure 16. Thorax with 

 three pairs of postsutural dorsocentrals; prealar very long; hypopleura hairy 

 on upj)er margin in front of spiracle. Abdomen narrowly ovate, basal sternite 

 bare, fifth with a deep posterior excision. Fore til)ia with a posterior median 

 bristle; fore tarsus slender, longer than tibia, without sensory hairs except at 

 apices of segments; mid femur with about four bristles on basal half of postero- 

 ventral surface; mid tibia with two or three posterior bristles; hind femur with 

 a series of long strong bristles on apical half of anteroventral surface, and many 

 long setulose hairs on basal half of ventral surfaces; hind tiljia with three or 

 four anteroventral setulac, which arc weaker than the series of anterior setulae, 

 the anterodorsal surface with from two to five unequal I)ri.stles, a weak bristle 

 basad of calcar and a series of fine erect hairs on middle of posterior surface, 

 the apex with the three dor.sal bristles equal (fig. 2.3). Costal thorn long. 



Female. — Differs from the male in having the frons over one-third of the 

 head-width, and the hind femora and tibiae with fewer hairs. 



Length, 7.5 to S nnu. 



TR.4XS. AM. E.VT. SOC, XLVIII. 



