1927] 
Ornithopomus americanus, 33 
Orthacheta brunneipennis, 102 
Orthacheta cornuta, 102 
Orthacheta dissimilis, 101 
Orthacheta hirtipes, 103 
Orthacheta strigipes, 102 
Osmia albohirta, 178 
OsMIA SANDHOUSEAE, 178 
Parasites of wood-boring insects, 7. 
Pavement ant, in Boston, 164 
Pediculoides ventricosus, 157 
Periplaneta americana, 211 
Periplaneta americana , thoracic £ 
rites and wing bases of, 59 
Perdita opuntioe, 201 
Pissodes strobi, 158 
Pleurotropis bucculatricis, 171 
Pleurotropis bucculatricis , parasitic 
Bucculatrix canadensisella, 171 
Polychrosis botrana, 146 
Prenolepsis henschei , 3 1 
Prenolepis pygmoea, 3 1 
Protocalliphora, in Bluebrid nest, 
Protocalliphora sialia, 33 
Protocalliphora splendida, 33 
Psithyrus ashtoni, 123 
Psithyrus laboriosus, 123 
Pyronata nubilalis, 229 
Rybaxis arkansana, 221 
Rybaxis clavata, 221 
Rybaxis conjuncta, 220 
Rybaxis geminata, 221 
Rybaxis my stica, 221 
Rybaxis, North american species, 
Index 255 
Rybaxis obliqued ens, 220 
Rybaxis transversa, 221 
Rybaxis truncaticornis, 220 
Rybaxis valida, 220 
Rybaxis varicornis, 221 
Scymnus, male genital tube of, 167 
Selenothrips, 234 
Sericothrips inversus, 232 
Sericothrips tricinctus, 231 
Sericothrips williamsi, 230 
Sitophilus granius, 158 
1 e-Sitophlus oryza, 158 
Sitotroga cerealella, 158 
Sphex ichneumoneus. 191 
Spinoliella, nesting habits of, 199 
Stagmatophora ceanothiella, 229 
on Stenamma, 30 
Strepsiptera, Hymenopterous nests of, 
182 
Tetramorium, coespitum, 164 
33Thysanoptera, neotropical, 230 
Tricyphona inconstans, on Nantucket 
Island, 216 
Tryphactothrips brevipilus, 243 
Tryphactothrips lineatus, 242 
Vine-moths, control of, 146 
Wings, basal structures of, in insects, 59 
Wood-boring insects, 73 
2 18 Xenos smithii, 191 
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