394 NORTH AMERICAN DIPTERA 



77. Apex of posterior coxae haired behind ChaetoKenia Malloch 



Posterior coxae bare behind 78 



78. Prosternum setose 80 



Prosternum bare 79 



79. Arista short plumose Steinella Malloch 



Arista long plumose (36) Cyrtoneuropsis Malloch 



80. Fourth vein curved foi'ward apically 81 



Fourth vein not curved forward apically Smithomyia Malloch 



81. Posterior tibiae with a strong posterodorsal bristle near the apical 



third Poecilophaonia Malloch 



Posterior tibiae without calcar (35) Cyrtoneurina Giglio-Tos 



82. Pteropleura haired 83 



Pteropleura bare 97 



83. Propleura haired in the middle 84 



Propleura bare in the middle 85 



/ 



\ 



Musca domestica L. 



84. Fourth vein ending well before the apex of the wing. . . .Musca Linnaeus 

 Fourth vein ending well behind the apex of the wing.Mallocharia Curran 



85. Proboscis tapering- from the base, long, adapted for biting (as in 



Stomoxys) Haematobosca Bezzi 



Proboscis short and stout, the labellae large 80 



86. Ridge at inner edge of lower squamal lobe bare 88 



Ridge at inner edge of lower squamal lobe with hairs 87 



87. Fourth vein ending before the wing-tip Orthellia Desvoidy 



Fourth veing ending behind the wing-tip (51, 54). . .* Philornis Macquart 



88. Fourth vein ending distinctly behind the wing-tip 90 



Fourth vein ending distinctly before the wing-tip 89 



89. Middle tibiae with a strong anteroventral bristle beyond the middle. 



Pyrellia Desvoidy 

 Middle tibiae without anteroventral bristle beyond the middle (42, 44). 



tMorellia Desovidy 



* Aldrich, 1923. Ann. Ent. Soc. Amei., xvi, p. 308. 



t Malloch, 1923, Ann. Mag. Nat. Hist., xii, pp. 520, 523. 



