39 2 



NORTH AMERICAN DIPTKRA. 



Archilestris, 198 

 Archytas, 577 

 Arctobiella, 296 

 Arctophila, 257 

 Argyra, 234 

 Arnoldia, 128 

 Arribalzagia, 188 

 Arthroceras, 162 

 Arthrocnodax, 128 

 Arthropeas, 162 

 Aseniosyrphus, 258 

 Asilus, 203 

 ASUJD/E, 192 

 Asindulum, 137 

 Asphondylia, 126 

 Aspistes, 144 

 Asteia, 302, 312 

 Astrophanes, 214 

 Asynapta, 129 

 Asyndetus, 233 

 Atacta, 372 

 Atarba, 88 

 Ateloglossa, 355 

 Atherix, 163 

 Athyroglossa, 307 

 Atomosia, 202 

 Atonia, 202 

 Atractia, 203 

 Atrichopogon, 116 

 Atropharista, 380 

 Atrophopalpus, 363 

 Atylotus, 181 

 Aulacigaster, 295 

 Automola, 276 

 Azelia, 336 



Baccha, 254 

 Baldratia, 127 

 Balioptera, 298 

 Baryphlegma, 287 

 Bathydexia, 354 

 Baumhaueria, 372 

 Belvosia, 372 

 Beris, 168 

 Berismyia, 168 

 Beskia, 371 

 Besseria, 377 

 Bezzia, 116 

 Bibio, 143 

 Bibiocephala, 151 

 Bibiodes, 143 



, 140 

 Bicellaria, 225 

 Biomyia, 373 

 Bischofia, 323 

 Bittacomorpha, 91 

 Blastocera, 172 

 Blepharepium, 201 

 Blepharipeza, 374 

 Blepharocera, 151 



BLEPHAROCKRID^, 148 

 Blepharoneura, 287 

 Blepharoprocta, 224 

 Bogeria, 347 

 Bolbomyia, 163 

 Boletina; 138 

 Bolitophila, 136 

 Bolomyia, 373 



BOMBYUID^E, 210 



Bombyliomyia, 377 

 Bombylius, 215 

 BORBORID^E, 315 

 Borborus, 316 

 Boreodromia, 223 

 Brachycatnpta, 139 

 Brachycoma, 375 

 Brachydeutera, 309 

 Brachyneura, 130 

 Brachyopa, 256 

 Brachyophyra, 334 

 Brachypalpus, 259 

 Brachypremna, 91 

 Brachystoma, 224 

 Brachypteromyia, 383 

 Bremia, 128 

 Bricinnia, 275 

 Briciniella, 275 

 Bryocrypta, 129 

 Bryomyia, 130 

 Bucentes, 371 



C 



Cacodaemon, 199 

 Cacomyia, 109 

 Cacosis, 171 

 Cacoxenus, 296 

 Csenia, 309 

 Callicera, 252 

 Callimyia, 243 

 Callinicus, 201 

 Calliphora, 343 

 Callopistria, 277 

 Calobata, 266 



