AMERICAN DIPTERA, 287 



48. Abdomen largely shiniug black podagra sp. nov. 



Abdomen wholly opaque pollinose seripes sp. nov. 



49. Wings subhyaline 50. 



Wings dark, at least apically 53. 



50. Thorax with three gray vitta- ; veins strong cornius Walker. 



Thorax black ; veins weak 51. 



51. Tarsi black xochitl Wheeler et Melander. 



Tarsi strongly annulate 52. 



52. Front metatarsi enlarged ; second antennal joint large, yellow. 



atrifemur Wheeler et Melander. 

 Front metatarsi slender; second antennal joint small, dark. 



annulipes Wheeler et Melander. 



53. Scutellum with four bristles 54. 



Scutellum with about twenty bristles liictuosa Kirby. 



54. Wings pale at base, reddish apically ; filament of hypopygium black at base. 



bicolor Bellardi. 

 Wings dark brown ; filament red lUOiitezuma Wheeler et Melander. 



55. Abdomen conspicuously shining 56. 



Abdomen pollinose, opaque 62. 



56. Scutellum with two bristles; thorax distinctly quadrivittate 57. 



Scutellum with four bristles ; lateral vittse indistinct 60. 



57. Hind knees simple ; hind margin of the abdominal segments narrowly cine- 



reous nuda Loew. 



Hind knees armed in the male; abdomen without cinereous fasciae 58. 



58. Front tibife apically, and front metatarsi wholly brown. 



loripedis Coquillett. 

 Legs almost wholly yellow 59. 



59. Humeri yellow gladiator sp. nov. 



Humeri dusted with cinereous arthrilica sp. nov. 



60. Antennal style one-third as long as the third joint otiosa Coquillett. 



Antennal style one-half as long as the third joint . . • 61. 



61. Eyes of the male contiguous; abdomen of male deep velvet black at the base; 



abdomen of female shining black Jolinsoni sp. nov. 



Eyes of male separated ; abdomen of male shining black over all (female ab- 

 domen largely yellow^ humile Coquillett. 



62. Abdomen yellow at base tersa Coquillett. 



Abdomen black or brown above 63. 



63. Antenna short, reddish at base tenebrosa Coquillett. 



Antennae black, or with base at most fuscous 64. 



64. Halteres black; male legs armed, the inner projection of their hind tibiae 



with a terminal spur-like brush ; upper hypopygial lamellae project- 

 ing ; tips of femora, tibiae and all of tarsi black ; a dense bunch of hair 



in front of the halteres valentis Coquillett. 



Without all these characters 65. 



65. Anal vein not reaching the margin; legs slender; wings rather long, pure 



hyaline 66. 



All the veins strong, fuscous 67. 



TRANS. AM. ENT. SOC, XXVIII. AUGUST, 1902 



