268 NORTH AMERICAN ANTHOMYIID FLIES OF GENUS PHAONIA 



coxae, fore femora except their apices, basal half of mid femora, and bases 

 of hind femora infiiscated, tarsi black. Wings hyaline, cross-veins not in- 

 fuscated. Calyptrae and halteres j^ellowish. 



Eyes densely long haired ; narrowest part of f rons as wide as distance between 

 posterior ocelli; orbits with fine bristles and hairs from base of antennae to 

 anterior ocellus, those above middle short and weak; parafacial at base of 

 antennae much narrower than third antennal segment, not narrowed below; 

 cheek about twice as high as width of third antennal segment, with about 

 five series of fine bristles on lower third, the upper two or three series weak, 

 upwardly curved anteriorly (fig. 12); third antennal segment fully twice as 

 long as second; longest hairs on arista distinctly shorter than width of third 

 antennal segment; palpi barely widened apically. Thorax with two pairs of 

 presutural acrostichals; prealar at least half as long as the bristle behind it; 

 postsutural dorsocentrals four; hypopleura with a few fine hairs below spiracle. 

 Abdomen broadly ovate; basal sternite bare, fifth with a very broad shallow 

 posterior emargination, appearing almost transverse. Fore tibia without a 

 median posterior bristle; fore tarsus distinctly longer than tibia, basal .segment 

 with the sensory hairs on post erio ventral margin very short, only the one at 

 apex long; mid femur with some bristles on basal half of posteroventral surface, 

 those at middle longest; mid tibia with three posterior bristles; hind femur 

 with a series of closely placed, moderately long bristles on entire anteroventral 

 surface, and some much finer bristles on basal half of posteroventral surface; 

 hind tibia with three or four anteroventral and two or three anterodorsal 

 bristles. 



Length, 7.5 mm. 



Redescribed from the specimen in the Hough collection which 

 is assumably the type. Locality, Moscow, Idaho. 



The allotype is not in the collection. Stein states in his 

 original description that the female has the femora entirely 

 yellow and the interfrontalia with a pair of cruciate bristles. 



Phaonia uniseriata new species 



Female. — Black, slightly shining, densely gray pruinescent. Interfrontalia 

 opaque brownish black when seen from above, the remainder of head except 

 eyes with brownish gray pruinescence; antennae and palpi entirely black. 

 Thorax indistinctly quadrivittate. Abdomen with a poorly defined dorso- 

 central vitta and lateral checkerings black. Legs black, extreme apices of 

 femora and at least the hind tibiae reddish. Wings slightly brownish, veins 

 brown, paler basally, cross veins slightly infuscated. Calyptrae and halteres 

 obscurely yellowish. 



Eyes with moderately long and dense hairs; frons one-third of the head- 

 width of vertex, widened anteriorly; interfrontalia bare; orbits narrow, each 

 with six or seven bristles and laterad of these n>nncrous setulose hairs; antennae 

 stout, third segment about twice as long as second; longest hairs on arista 

 not longer than its basal diameter; jiarafacial at ba.se of anteiuiac a little wider 

 than third antennal segment narrowed below; cheek a little higher than 



