148 
obscura, puparium, 23 
sex-combs, 44 
spermatheca, 35, 37 
obscuripennis (Leucophenga), 61, 106 
occiput, 25 
ocellar bristles, 26 
ocelli, 27 
Ochthiphila, 31 
Ochthiphiline, 22, 38 
Ohio, 111 
Oklahoma, 111 
Oldenberg, L., 44, 57, 61, 62 
olfactory reactions, 4 
Oligoneura, 48 
ommatidia, 27 
Ontario, 112 
opaca, 70, 120 
description and distribution, 104 
key, 68 
oral bristles, 25, 26 
oral lobes, 26 
orbit, 25 
orbital bristles, 25 
orbitalis (Zaprionus), 58, 106 
ordinaria 
description and distribution, 86 
key, 67 
Oregon, 111 
Oriental region, 108, 115, 116 
ornatipennis, see calloptera ornatipennis 
Ortalinez, 22, 38, 40 
Orthostegana, 56, 132 
ovaries, 38 
Ovipositor, 32, 33 
Oxyleucophenga, 59, 132 
Palearctic region, 108, 114, 115 
pallida, 89, 106 
palpus, 26 
Panama, 113, 114 
paradoxa 
description and distribution, 72 
key, 68 
Paraleucophenga, 59, 132 
parasites, 17 
Paratissa, 48, 107 
Parydra, 38 
Payne, F., 2, 4, 103 
penis, 35 
Pennsylvania, 111 
Periscelis, 48, 49, 107 
Perkins, F. H., 18, 66, 117 
perspicax (Gitona), 115, 116 
Phoride, 18, 36 
Phortica, 44, 56, 132 
Phycodromine, 38 
Physogenua, 40 
Phytomyza, 31, 121 
pictus (Sinophthalmus), 54 
pinning, 46 
Piophila, 22, 31, 40, 98 
Piophiline, 8, 22, 40 
pleuralis (Mycodrosophila), 63, 106 
plexus, 121 
Plough, H. H., 38 
plurilineata, 77 
poeyi 
description and distribution, 76 
INDEX. 

poeyi, key, 69 
pointed, 120 
points, 46 
pollinosa, 106 
Polynesian region, 108, 116, 117 
Porto Rico, 114 
postalars, 28 
posterior cells, 29 
postvertical bristles, 26 
preapical bristles, 29 
prementum, 21 
prescutellar bristles, 28 
preservation, 46 
presutural bristle, 28 
proboscis, 26 
proclinate, 25 
procnemis (Chymomyza), 106, 109, 112 
chromosomes, 39 
courtship and mating, 8 
distribution, 62 
eggs, 19 
key, 61 
puparium, 23, 24 
variability, 42 
| prognatha, 70 
description and distribution, 75 
key, 68 
projectans (Mycodrosophila), 63, 106 
propleura, 28 
prothorax, 27-28 
Pseudiastata, 50, 108, 109, 113, 132 
description and distribution, 55 
pseudomelanica 
description and distribution, 94 
key, 67 
Pseudophortica, 50, 108, 109, 132 
description and distribution, 58 
pseudopodia, 20 
pseudotrachex, 26 
pteropleura, 28 
ptilinum, 24 
| pulchella 
description and distribution, 88 
key, 68, 69 
| Puliciphora, 121 
pulvillus, 29 
punctulata, 99, 100, 106 
pupa, 22-24 
puparium, 22-24 
putrida, 81 
courtship, 7 
description and distribution, 81 
eggs, 19 
key, 67 
spermatheca, 37 
Quackenbush, L. S., 92 
quadrata 
description and distribution, 76 
key, 68 
| quadrimaculata, 60, 106 
| Quebec, 112 
quinaria, 81 
chromosomes, 39 
description and distribution, 80 
eggs, 19 
key, 67 
puparium, 24 
