THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 31 



63. Middle and hind femora each with two preapical bristles; hind tibiae black with 



their base yellow or yellow with tip and a stripe on inner side black. 



No. 54, remus, new species. 

 Middle and hind femora each with one preapical bristle 64. 



64. Middle femora black at base, shading into yellow toward the tip 65. 



Middle femora mostly yellow on the sides, black at base and on lower edge as far 



as the middle or nearly so 66. 



65. Small species, face silvery white, orbital cilia whitish. No. 44, xanthocnemus Loew. 

 Rather large species; face gray; orbital cUia yellow. No. 51, sedulus, new species. 



66. Orbital cilia wholly black No. 52, groenlandicus Zetterstedt. 



Lateral and inferior orbital cilia pale No. 51, sedulus, new species. 



67. First antennal joint black above, yellow on lower half; lower orbital cilia yellow- 



ish No. 66, varipes Coquillett. 



First antennal joint wholly yellow; orbital cilia wholly black. 



No. 67,flavilacertus, new species. 



68. Lower orbital cilia and antennae wholly black; middle and hind femora each 



with two preapical bristles No. 63, opportunus, new species. 



Lower orbital cilia pale 69. 



69. First and second antennal joints broadly yellow below; the usual preapical 



bristle on hind femora ending a row of three or four bristles. 



No. 62, amnicola Melander and Brues. 

 Antennae wholly black; hind femora with one preapical bristle 70. 



70. Hind tibiae mostly yellow No. 61, bryanti, new species. 



Hind tibiae almost wholly black No. 217, micropyga Wahlberg. 



71. Orbital cilia wholly black 72. 



Lower orbital cilia pale 82. 



72. Fore coxae black or green, the tips may be yellow 73. 



Fore coxae yellow, the outer side may be more or less black or green 75. 



73. First and second antennal joints yellow below No. 161, bru£si, new name. 



Antennae wholly black 74. 



74. Front violet No. 82, pachycnemus Loew. 



Front green No. 68, rupestris Haliday. 



75. Middle basitarsi with a large bristle above 76. 



Middle basitarsi without a bristle above 77. 



76. Antennae wholly black No. 85, hrevipennis Meigen. 



First antennal joint yellow No. 88, dorycerus Loew. 



77. Posterior basitarsi with only one large bristle above; a small, very shining species. 



No. 84, barbipes, new species. 

 Posterior basitarsi with more than one large bristle above 78. 



78. Front thickly covered with brown pollen, nearly or quite concealing the 



ground color No. 68, rupestris Haliday. 



Front metallic, shining 79. 



79. Antennae wholly black 80. 



First and second antennal joints yellow below 81. 



80. Hind tibiae black at tip for nearly or quite one-third their length. 



No. 85, brevipennis Meigen. 

 Hind tibiae black at tip for about one-fifth their length. 



No. 83, ungulatus Linnaeus. 

 Hind tibiae wholly yellow No. 161, bruesi, new name. 



81. Orbital cilia wholly black No. 161, bruesi, new name. 



Lower orbital cilia yellow with from one to six black bristles next to the 



proboscis No. 160, consanguineus Wheeler. 



82. Cilia of the calypters pale 83. 



Cilia of the calypters black 105. 



