400 



NORTH AMERICAN DIPTERA. 



(Estrus, 347 

 Olbiogaster, 156 

 Olfersia. 

 Oligarces, 130 

 Oligotrophus, 128 

 Ommatius, 203 

 Omomyia, 317 

 Oncodes, 185 

 Oncodocera, 216 

 Onesia, 350 



Ophthalmoinyia, 295, 390 

 Opsebius, 185 

 Odsidia, 376 

 Opsiomyia, 330 

 Oreogeton, 225 

 Oreothalia, 224 

 Orimarga, 88 

 Ornithoctena, 383 

 Ornithodes, 90 

 Ornithoica, 383 

 Ornithoniyia, 383 

 Ornithopertha, 383 

 Orphnephila, 154 

 ORPHNEPHILID^e, 153 



ORTALIDID^;, 271 

 Orthochseta, 330 

 Orthocladius, 115 

 OscixiD^e, 310 

 Oscinia, 312 

 Ospriocerus, 198 

 Ostracocoelia, 275 

 Oxycera, 171 

 Ozodiceromyia, 207 



P 



Pachycerina, 290 

 Pachygaster, 172 

 Pachymeria, 226 

 Pachyophthalmus, 372 

 Palloptera; 290 

 Pachyrhina, 91 

 Palponiyia, 116 

 Paltostoma, 151 

 Panacris, 172 

 Paneryma, 279 

 Pangonia, 180 

 Pantarbes, 215 

 Pantophthalmus, 175 

 Panzeria, 373 

 Parabombylius, 215 

 Parachaeta. 374 

 Paraclius, 233 

 Paracosmus, 217 



Paradejeania, 377 

 Paradidyma, 375 

 Parodinia, 296 

 Paradyschiria, 

 Paradniontia, 363 

 Parafischeria, 380 

 Paragsedia, 377 

 Paragus, 252 

 Paragorgopis, 277 

 Parahypochaeta, 377 

 Paralimna, 308 

 Paralleloma, 329 

 Paramesocheeta, 373 

 Paramintho, 350 

 Paraniyia, 294 

 Paranophora, 379 

 Paraphyto, 374 

 Paraplagia, 372 

 Paraprosena, 357 

 Paratissa, 367 

 Parasy mormon, 235 

 Parathalassina, 224 

 Paratropesa, 819 

 Parephydra, 307 

 Parepalpus, 376 

 Parexorista, 379 

 Parydra, 309 

 Paroedopa, 277 

 Peckia, 350 

 Fed ice I la, 172 

 Pedicia, 90 

 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 

 Peratochaetus, 298, 330 

 Pericoma, 93 

 Pero, 130 

 Peromyia, 130 

 Peronynia, 286 

 Perrisia, 127 

 Peteina, 377 

 Phalacrocera, 90 



