280 NORTH AMERICAN ANTHOMYIID FLIES OF GENUS PHAOXIA 



submedian vittae; prealar long; postsutural dorsocentrals three. Abdomen 

 narrow, almost subcylindrical, basal sternite bare, fifth with a broad deep 

 posterior excision. Fore tibia with a median posterior bristle; fore tarsus 

 slender, longer than tibia, without long sensory hairs on posterior surface of 

 basal segment; mid femur with one bristle near base on posteroventral surface; 

 mid tibia with two or three posterior bri.stles; hind femur with some weak 

 bristles on anteroventral surface, only the apical one long; hind tibia with 

 one anterodorsal and one long and one or two short anteroventral bristles and 

 a few short posterior setulae, the calcar at least one-third of the tibial length 

 from apex, all three dorsal apical bristles long (fig. 22). 

 Length, 5 to 5.5 mm. 



Type. — Riverton, New Jersey, April 20, (C. W. Johnson), 

 [Boston Society of Natural History]. Two male paratypes. River- 

 ton, New Jersey, August 17, (C. W. Johnson), and Falls Church, 

 Virginia, April 23, (N. Banks). 



The paratypes have the femora much paler than does the type, 



Phaonia fusca (Stein) 



Spilogaster fusca Stein, Berl. ent. Zeitschr., 1897, p. 189. 



This species is one of the commonest and one of the most 

 varialjle of the genus occurring in this country. In most speci- 

 mens there are one or two weak hairs at base of third wing-vein 

 on the under surface, a character which if invariably present 

 would readily separate it from its allies. There are but few 

 species which possess this cliaracter, though atlanis does. There 

 are also usually one or two fine hairs adjacent to the base of the 

 posterior notopleural bristle and the biistle at apex of postero- 

 dorsal surface of hind tibia is very much weaker than the dorsal 

 and anterodorsal l)ristles, facts which show its relationshi]) with 

 the errans group, rather than with those with which it falls in 

 the key, though like them it has only three pairs of postsutural 

 dorsocentrals. Profile of head as in figure 17. 



There are no species known to me from North America willi 

 which this species can readily be confused, except those with 

 which it is comimred in the key. 



I have taken the species commonlj^ on tree-trunks along the 

 margins of woods in Illinois from May to August, and have seen 

 many specimens from other states, inc^luding Ohio, Mrginia, 

 New York, New Jersey and New Hami)sliire. 



