268 The Ohio Journal of Science [Vol. XX, No. 7, 



narrowly ovate; basal sternite with some hairs; fifth sternite with a 

 broad, shallow rounded posterior excision; hypopygium small. Fore 

 tibia without long ventral hairs, median bristle, or apical posterior 

 bristle; fore tarsus slender, longer than tibia; mid femur with rather 

 long hairs on basal half of ventral and posteroventral surfaces, but 

 without bristles; mid tibia with one posterior bristle; hind femur with 

 fine bristles and long hairs on antero ventral surface, the posteroventral 

 and ventral surfaces with long hairs on basal half; hind tibia with three 

 or four antero ventral, and two anterodorsal bristles, the calcar short, 

 about one-fifth of the tibial length from apex. Costal thorn short; 

 outer cross-vein curved; last section of fourth vein about 1.75 as long as 

 preceding section. 

 Length, 6 mm. 



Type and two male paratypes, Savonoski, Naknek Lake, 

 Alaska, July, 1919. 



Phaonia citreibasis sp. n. 



Male and Female. Glossy black; orbits and cheeks whitish prui- 

 nescent; thorax with gray pruinescence, distinctly but not conspicuously 

 vittate; abdomen in male with a poorly defined dorsocentral vitta, in 

 female entirely glossy black. Legs black. Wings clear, conspicuously 

 orange colored at bases, the cross-veins narrowly infuscated. Calyptrae 

 and halteres orange yellow. 



Male. Eyes with very sparse short hairs; frons about as wide as 

 distance across posterior ocelli; interfrontalia not obliterated; orbits 

 setulose almost to anterior ocellus; parafacial as wide as third antennal 

 segment, but little narrowed below; cheek nearly twice as high as widest 

 part of parafacial, with a series of lower marginal bristles and some 

 setulae above them; arista pubescent; third antennal segment over twice 

 as long as second. Presutural acrostichals distinct, usually two weak 

 pairs with many interspersed hairs ; prealar bristle nearly as long as the 

 bristle behind it; post-sutural dorsocentrals 4; hypopleura bare; stemo- 

 pleurals 1:2 or 1:3. Abdomen elongate oval; basal sternite bare; 

 dorsum with long bristles, especially apically; hypopygiimi smaU; 

 fifth sternite with a broad basally truncate excision. Fore tibia without 

 a median bristle, the ventral hairs distinct, but not long; fore tarsus 

 slender, much longer than tibia; mid-femur with setulose hairs ventraUy, 

 those on basal half of posteroventral surface longer and stronger than 

 the others; mid tibia without anterodorsal bristles, and with two to 

 four posterior bristles; hind femur with a series of bristles on antero- 

 ventral surface and long hairs on posteroventral ; hind tibia with two to 

 four antero ventral, and two anterodorsal bristles, the calcar long, 

 posterior surface with a few short hairs. Costal thorn short. 



Female. Similar to male in thoracic chaetotaxy. The frons is one- 

 third of the head width, the orbits narrow, each with 2-t-4 bristles and 

 some weak setulae. Legs without the long hairs present in male. 



Length, 8 mm. 



