NO. 1938. THE DIPTEROUS FAMILY PHORID^—MALLOCH. 457 



61. .Antennse brownish yellow, cave species cavemicola, p. 491. 



Antennae black peregrina, p. 492. 



62. Hind tibiae with distinct setulae, which are not particularly numerous nor closely 



placed 63. 



Hind tibial setulae indistinct, hair-like and very numerous in the species with 

 long costa; if the setulas are somewhat more distinct and sparse then the costa 

 is very short 65. 



63. Two distinct post-antennal bristles, frons not longer than broad nor noticeably 



polished 64. 



Frons noticeably longer than broad, distinctly polished, four post-antennal bristles 

 present; costal fringe very short, fourth vein nearly straight at base. 



minor male, p. 494. 



64. Black species; costa to near middle, fourth vein distinctly bent at base, fringe 



long, thick veins black dyari, p. 493. 



Brown -black species; costa to two-fifths of wing length, fringe of moderate length, 

 fourth vein nearly straight at base, thick veins flavous flavinervis, p. 493. 



65. Costa to middle of wing or near to it, always more than one-third the wing 



length 66. 



Costa to barely more than one-third the wing length pijgmasa, p. 499. 



66. Four large and nearly equal post-antennal bristles 67. 



Lower pair of post-antennal bristles very much reduced in size or absent 71. 



67. Costa to middle of wing, fringe very long 68. 



Costa to short of wing middle, fringe very short 70. 



68. Abdomen in male with long scale-like hairs, female abdomen with scattered hairs, 



fourth vein bent at base rufipes, p. 494. 



Abdomen in male with only the ordinary hairs 69. 



69. First costal division not longer than second and third together . .puUcaria, p. 495. 

 First costal division distinctly, but not greatly longer than second and third 



together evarthse, p. 472. 



70. Black species; frons longer than broad, highly polished; legs strong, fourth vein 



very slightly bent at base, costa to just short of wing middle, wings infuscated. 



minor, p. 494. 



Brownish or yellowish species, costa distinctly short of middle, frons not highly 



polished setacea, p. 495. 



71. Hind tibiae in male flattened on the apical third of dorsal surface 72. 



Hind tibiae normal 73. 



72. Last abdominal segment to male with distinct long hairs; costa to short of or near 



to middle of wing alhidohalteris, p. 496. 



Last abdominal segment in male without such long hairs, costa to beyond middle. 



smithi, p. 497. 



73. Frons distinctly shining, longer than broad, lower pair of post-antennal bristles 



about half as large as upper pair, center pair of bristles in first row much lower 



on frons than outer pair fuscopedunculata, p. 498. 



Frons barely shining, broader than long, center pair of bristles in first row nearly 

 in transverse line with outer pair agarici, p. 499. 



APmOCHiETA MARGINALIS, new species. 



Female. — Black; frons dull black, four strong, nearly equal-sized 

 post-antennal bristles, the lower pair much closer than the upper, 

 antennse brown, normal in size, palpi yellow, moderately bristled; 

 thorax somewhat shining, scutellum mth six bristles, the outer and 

 center pairs- weaker, mesopleurse with one long and very strong bristle 



