J. R, MALLOCH 2(53 



Phaonia dissimilis new species 



Male. — Shilling black, with rather dense bluish gray pruinescence. Head 

 black, interfrontalia opaque, orbits, parafacials, and cheeks with silk}- white 

 pruinescence. Thorax distinctly (juadrivittate. Abdomen with a black dor.sc- 

 central vitta and lateral checkerings. Legs black. \\'ings clear, veins black, 

 cross-veins faintly darkened. Calyptrae white, the outer margin of the lower 

 one fuscous, much darker than the field. Halteres bro\\-n. 



Eyes rather long haired, separated at narrowest part of frons by about the 

 width of third antennal segment; orbits not contiguous, setulose almost to 

 anterior ocellus; parafacial at base of antennae about as wide as third antennal 

 segment, slightly narrowed below; cheek twice as high as widest part of para- 

 facial, with some fine bristles on margin and above them two series of fine 

 hairs; third antennal segment about twice as long as second; arista with its 

 longest hairs a little longer than its basal diameter. Thorax without strong 

 presutural acrostichals; postsutural dorsocentrals four; prealar long; no hairs 

 adjacent to notopleural bristles; hypopleura bare. Abdomen ovate. Basal 

 sternite bare, fifth with a broad moderately deep posterior excision. Fore 

 tibia without a median posterior bristle, the hairs on that surface longer than 

 usual, forming a series of suberect setulae from base to apex; fore tarsus 

 slender, longer than tibia, the basal segment with the posterior sensory hairs 

 of moderate length; mid femur with rather long hairs on ventral surfaces, 

 those on basal half of posteroventral surface stronger than the others; mid 

 tibia with three posterior bristles, the short hairs longer than usual, especially 

 on posteroventral and posterodorsal surfaces, those on latter forming a series 

 of setulae on its entire length; hind femur similar to mid pair but with a series 

 of bristles on apical half of anteroventral surface; hind tibia with two antero- 

 dorsal and two cr three anteroventral bristles, the surface hairs on posterior 

 and anterodorsal surfaces setulose. 



Length, 7.o mm. 



Type. — Savonoski, Naknek Lake, Alaska, July, 1919, (J. S. 

 Hine), [Ohio State University]. 



Phaonia imitatrix Malloch 



Phaotiia iimlidrix Malloch, Rep. Can. Arctic Expcd. 19I.'J-1S, iii, Insects, 



pt. C, Diptera, p. 61c, 1919. 



Male. — Glos.sy black, almost without pruinescence except on orbits, para- 

 facials, face and cheeks. Legs black. Wings clear, fuscous at bases, veins 

 black. Calyptrae white. Halteres black 



Eyes almost bare; frons at least twice as wide as distance across posterior 

 ocelli; orbits narrow, rather strongly bristled up to anterior ocellus; parafacial 

 at base of antennae as wide as third antennal .segment, not narrowed below; 

 vibrissal angle produced; cheek over one-third as high as eye; arista almost 

 bare. Thorax with four pairs of postsutural dorsocentrals; prealar almost as 

 long as the bristle behind it. Abdomen subcylindrical, slightly tapered 

 apically; basal sternite bare, fifth with an undulated posterior emargination. 



TRANS. AM. ENT. SOC, XLVIII. 



