244 NORTH AMERICAN ANTHOMYIID FLIES OF GENUS PHAONIA 



39. Hind femur with a short stout downwardly directed bristle about one- 



fourth of the femoral length from apex on the posteroventral surface, 

 in addition to the long fine bristles morrisoni new species 



— Hind femur without a bristle as described above .... miniina Malloch 



40. Thorax with well differentiated presutural acrostichal bristles, and four 



pairs of postsutural dorsocentrals; hypopleura sometimes with a few 

 hairs in middle below spiracle or on upper margin in front of spiracle; 

 sometimes the palpi of the female are dilated and the fourth tergite 

 in same sex is distinctly longer than third 41 



— Thorax without well differentiated presutural acrostichal bristles; if 



these are moderately well developed there are only three pairs of post- 

 sutural dorsocentrals present, or the posterior bristles on mid tibia 

 are not in a single series and the hypopleura is bare 48 



41. Legs, including the coxae and tarsi, entirely j'ellow; cross- veins of wings 



not darker than the other veins; fore tarsus with a few outstanding 

 sensory hairs along the posteroventral surface of basal segment; hind 

 femur without long bristles en basal half of posteroventral surface; 

 neither notopleural bristle with hairs at base . marylandica new species 



— Legs with at least the tarsi black; cross-veins sometimes very conspicu- 



ously inf uscated 42 



42. Cross-veins of wings not at all noticeably darker than the other veins; 



abdomen with a blackish dorsocentral vitta and no distinct lateral 

 blackish spots or checkerings; abdomen in female in known species 

 with the fourth tergite distinctly longer than the third; hypopleura 

 with usually a few hairs on middle just below spiracle 43 



— Cross-veins of wings very noticeably infuscated; fourth tergite of abdomen 



in female not elongated 45 



43. Posterior notopleural bristle without fine hairs adjacent to its base. 



harti new species 



— Posterior notopleural bristle with some fine hairs adjacent to its base. .44 



44. Apex of scutellum reddish j'ellow; presutural acrostichal bristles moder- 



ately widely separated, in pairs; frons of female with a pair of inter- 

 frontal cruciate bristles striata Stein 



— Apex of scutellum not j'ellowish, concolorous with disc; presutural acro- 



stichal bristles almost uniserial, not in distinct pairs; frons of female 

 without cruciate interfrontal bristles uniseriata new species 



45. Outer cross- vein of wings straight or very slightly curved; abdomen with 



a dorsocentral vitta and lateral checkerings black; anteroventral 

 bristles on hind femur short and strong. . . .brevispina new species 



— Outer cross-vein curved but not conspicuously so; abdomen with a black 



dorsocentral vitta; anteroventral bristles on hind femur long on apical 

 half, their length exceeding diameter of femur. . fuscicauda Malloch 



— Outer cross-vein of wings very conspicuously curvcnl forward in middle; 



abdomen with a dorsocentral vitta and lateral spots on each tergite 

 blackish 46 



