400 



NORTH AMERICAN DIPTKRA. 



(Estrus, 347 

 Olbiogaster, 156 

 Olt'ersia, 

 Oligarces, 130 

 Oligotrophies, 128 

 Omniatius, 203 

 Omomyia, 317 

 Oucodes, 185 

 Oucodocera, 216 

 Onesia, 350 



Ophthalmomyia, 295, 390 

 Opsebius, 185 

 Odsidia, 376 

 Opsiotnyia, 330 

 Oreogetou, 225 

 Oreothalia, 224 

 Orimarga, 88 

 Ornithoctena, 383 

 Ornithodes, 90 

 Ornithoica, 383 

 Ornithomyia, 383 

 Ornithopertha, 383 

 Orphnephila, 154 

 Orphnkphilid^;, 153 

 Ortalidid^, 271 

 Orthochaeta, 330 

 Orthocladius, 115 

 OsciNiDi^, 310 

 Oscinia, 312 

 Ospriocerus, 198 

 Ostracoccelia, 275 

 Oxycera, 171 

 Ozodiceromyia, 207 



P 



Pachycerina, 290 

 Pachygaster, 172 

 Pachymeria, 226 

 Pachyophthahnus, 372 

 Palloptera; 290 

 Pachyrhina, 91 

 Palpomyia, 116 

 Paltostoma, 151 

 Panacris, 172 

 Paneryma, 279 

 Pangonia, 180 

 Pantarbes, 215 

 Pantophthalmus, 175 

 Panzeria, 373 

 Parabombylius, 215 

 Paracheeta. 374 

 Paraclius, 233 

 Paracosmus, 217 



Paradejeania, 377 

 Paradidynia, 375 

 Parodima, 296 

 Paradyschiria, 

 Paradmontia, 363 

 Parafischeria, 380 

 Paragaedia, 377 

 Paragus, 252 

 Paragorgopis, 277 

 Parahypochaeta, 377 

 Paralimna, 308 

 Paralleloma, 329 

 Paramesochaeta, 373 

 Paramiiitho, 350 

 Pa ram via, 294 

 Paranophora, 379 

 Paraphvto, 374 

 Parapla'gia, 372 

 Paraprosena, 357 

 Paratissa, 367 

 Parasy mormon, 235 

 Parathalassina, 224 

 Paratropesa, 819 

 Parephydra, 307 

 Parepalpus, 376 

 Parexorista, 379 

 Parydra, 309 

 Parcedopa, 277 

 Peckia, 350 

 Pedicel la, 172 

 Pedicia,;9o 

 Pegomyia, 335 

 Pelagomyia, 171 

 Pelastoneurus, 232 

 Pelatachina, 367 

 Pelateria, 377 

 Pelecocera, 252 

 Pelina, 308 

 Pelomyia, 295, 307 

 Pelorempis, 107 

 Peloropeodes, 233 

 Pentacricea. 336 

 Penthoptera, 90 

 Penthosia, 373 

 Peratochsetus, 298, 330 

 Pericoma, 93 

 Pero, 130 

 Peromyia, 130 

 Peronyma, 286 

 Perrisia, 127 

 Peteina, 377 

 Phalacrocera, 90 



