AMERICAN DIPTERA. 289 



84. Third vein furcate beyond the tip of the marginal cell. 



<lolabraria sp. nov. 

 Third vein furcate before the tip of the marginal cell. 



dolabraria snbsp. <liKcoiiTenita. 



85. Front metatarsi thickened, black ; hind tibia? shaggy. • .canaster sp. nov. 

 Front metatarsi slender, red ; legs not shaggy falfala sp. nov. 



86. Third antennal joint short and broad ; second segment of abdomen with a 



conspicuous fringe of long black bristles toward the sides; abdomen 



brownish poUinose giilosa Coquillett. 



Third antennal joint long, slender; abdomen generally gray pollinose 87. 



87. Slender species; dusted with whitish ; wings narrow; base of the femora and 



tibiae paler than the apex sleiioptera Loew. 



Of other con formation 88. 



88. Species marked with yellow t'lauila Coquillett. 



Ground color wholly black 89. 



89. At most three bristles in front of the halteres ; antennae comparatively long..90. 

 Several bristles in front of the halteres; antennae shorter 91. 



90. Hind coxae with conspicuous hairs on their front side . . ■ .falcata sp. nov. 

 Hind coxae with but few apical hairs iiiida Loew. 



91. Third vein furcate beyond the tip of the marginal cell, the posterior branch 



ending before the apex of the wing; occiput densely bristly 92. 



Furcation of the third vein opposite or in advance of the tip of the marginal 

 cell, the posterior branch terminating at or beyond the wing tip-. .94. 



92. Large gray-white species devoid of brownish pollen; third vein distinctly 



arched forward so that the first submarginal cell is narrowed. 



seripes sp. nov. 



Smaller species, in part brownish pollinose; third vein straight before its 



furcation 93. 



93. With six scutellar bristles dolabraria sp. nov. 



With four scutellar bristles iiiixopolia sp. nov. 



94. Legs glaucous; abdominal segments margined with gray posteriorly. 



caciiininifer s]). nov. 

 Legs shining; abdomen unicolorous 95. 



95. Vein between discal and fourth posterior cells much shorter than that be- 



tween the third and fourth posterior cells 96. 



The two sections equal dolabraria suhsp. disconveiiita. 



96. Species of the Middle States; hind tibiae straight, rather stout cylindrical; 



hind femora with numerous thorn-like bristles distally. 



euodis sp. nov. 

 Species of the Western States; hind tibiae distinctly bent near the knee; bris- 

 tles of the hind femora longer 97. 



97. Coxae generally wholly black; abdomen brownish dusted ; middle tibite fim- 



briate apically with a few stiff black bristles. 



serperastroruin sp. nov. 



Coxae reddish apically ; abdomen slaty gray ; middle tibiae not spurred with 



terminal bristles canaster sp. nov. 



Einpis anniilipes Wheeler et Melander (Fig. 115). 

 Biol. Cent. Am., Dipt. Suppl., Nov., 1901, p. 369. 



Female. — Black. Front and face dusted with white. Antennae black ; the third 



TRANS. AM. ENT. SOC, XXVIII. (37) .\UGUST, 1902. 



