1920] 



Index 



159 



Pachygastrinae, new, ll'-2. 



Pachymenes symmorpliiis, 11. 



Paramelinus bipunctatus, 11. 



Perdita octomaculata, 12. 



Phylogeny of Lepidoptera and Trichop- 

 tera,*34. 



Phynoponera , .3 .S . 



Pityophorus bassetti, 1 . 



Pityophorus occidentalis, 4. 



Pogonomyrmex, 5*2. 



Pogonomyrmex californiciis, 72. 



Polyporus versicolor, beetle.s of, 17, 137. 



Proceedings of the Cambridge Entomo- 

 logical Club, 19, 66, 87, 127. 



Pseudopsila, table of species, 17. 



Pseudopsila pcrpolifu, 18. 



PseudophomomjTTnex, 53. 



Psephiocera dorsata, 114. 



Psephioccra niefzi, 114. 



Psephiocera tninuta, 113. 



Psephiocera, table of species, 112. 



Psila colorata, 95. 



Psila atrata, 96. 



Psila microcera, 95. 



Psila, table of species, 93. 



Psila washingtona, 96. 



PsUhjrus ashtoni, 10. 



Psithynis hihoriosus, 10. 

 Psilidse, synopsis of, 91. 

 Pterogates of ants, 72. 



Rhogas pilosus, 59. 



Schendylellus, 65. 



Schendylellus hodites, 65. 



Sima tcssnianni, 53. 



Sogalabis, (i3. 



Sogalabis scapheus, 64. 



Sphaerojiyx, 59. 



Strepsiptera, male genitalia of, 34. 



Strongylophtbalma angustipennis, 100. 



Telenomus euproctidis, 79. 

 Telenomus hemerocampae, 78. 



Tetragoneuria canis, 155. 

 Traclujpchis clarafvs, 59. 

 Trichoptera, external anatomy of, 23. 



Viticicola,53. 

 VoUenhovia rvfiventris, 53. 



Wliite Pine Aphid, 62. 

 Winged Insects, descent of, 116. 



Xenoglossa prvinosa, 12. 



