323 
1924] Index 
Opacifrons cartagensis, 122, 126 
Opacifrons coelobata, 126 
Opacifrons convexa, 130 
Opacifrons coxata, 123 , 129 
Opacifrons grandis, 123 
Opacifrons pellucida, 127 
Opacifrons sciaspidis, 124 
Opacifrons wheeleri, 128 
Orasema viridis, 52 
Oregon, new bee from, 243. 
Orgizomyia, 27 
Orgyzomyia, 27 
Ornithophilous flowers, 102 
Orthochaeta dissimilis, 194. 
Orthostylus amhigus, 29 
Psedogenesis of Oligarces, 148 
Palimmecomyia celcEnospila, 29 
Pangonia appendiculata, 38 
Pangonia hifasciata, 39 
Pangonia ferus, 39 
Pangonia fuMthorax, 38 
Pangonia fuscipennis, 28 
Pangonia incompleta, 27 
Pangonia longirostris, 39 
Pangonia maculata, 39 
Pangonia mesembrinoides, 26 
Pangonia parva, 29 
Pangonia rasus, 33 
Pangonia suavis, 38 
Pangonia tranquillus, 33 
Pango\iia rod, 38 
Pangonius, 26. 
Pangonius austeni, 34 
Pangonius brevis, 34 
Pangonius maculatus, 39 
Pangonius marginatus, 39 
Pangonius neavei, 34 
Pangonius proboscideus, 39 
Panurgidae, note on, 312 
Parahalictoides 
Parasilvius fulvus, 29 
Parasite of an ant, 49 
Parthenogentic may-fly, 308. 
Paw-paw, diptera in, 91. 
Pelecinella, 302. 
Pelecorrhynchus, 27 
Phalacrotophora jacobsobi, 209 
Phalacrotophora punctifrons, 207 
Phora, 27 
Phormia regina, 17 
Phasia jugatoria, 8 
Phenology of, anthophilous insects, 
105 
Phibalomyia carteri, 29 
Philoliche rostratus, 39 
Philorites johannseni, 29 
Phloethrips maculatus , 295 
Phoeomyia, 29 
Phoeoneura, 29 
Phoetabanus litigiosus, 29 
Phora bicolor ata, 207 
Phoridae african, 87 
Phoridae from Formosa, 206 
Phoridae from New England, 41 
Phoridae, new American, 155 
Phyracaces, affinities 
Piesma cmerea, habits, 233 
Piesma cinerea, life history, 230 
^Piophila affinis, 82. 
Piophila, key to species, 83 
PlOPHILA MORATOR, 85 
Piophila privigna, 86 
Piophilidae, review of, 78 
Plectothrips atactus, 298 
Poecilosoma quadripunctata, 30 
Pollination of flowers by insects, 93 
Pollenia rudis, 17 
Polyrhachis dives, 51 
Prenolepis gibber osa, 23 
Proceedings of the Cambiidge Ento- 
mological Club, 170, 245, 313 
Prochyliza brevicornis, 81 
Prochyliza xanthostoma, 82 
Pseudochalcura gibbosa, 55. 
Pseudoclinia, 83 
Psilogaster fasciivendis, 52 
Psyche, early history of, 3 
Pteremis, 121, 131 
