REFERENCES 387 
Musca domestica, Farmers’ Bull. 459. 
Myzus cerasi, Colo. Exp. Sta. Bull. 133. 
Myzus persice, Colo. Exp. Sta. Bull. 133. 
Myzus ribis, N. Y. Geneva, Exp. Sta. Bull. 139. 
Noctuidae, Ill. Exp. Sta. Bull. 95. 
Nystus angustatus, 23d Rpt. Ill. State Ent., page 117. 
Oberea bimaculata, Ohio Exp. Sta. Bull. 96. 
€canthus spp., 23d Rpt. Ill. State Ent., page 215. 
Cstrus ovis, Bur. Ent. Bull. 5. 
Oncideres cingulatus, Okla. Exp. Sta. Bull. 91. 
Otiorhynchus ovatus, Maine Exp. Sta. Bull. 123. 
Oxyptilus periscelidactylus, 4th Rpt. Minn. State Ent., page 221. 
Pachymerus chinensis, Yearbook, U.S.D.A., 1898, page 242. 
Pachymerus quadrimaculatus, Yearbook, U.S.D.A., 1898, page 245. 
Pachynematus extensicornis, Insect Life, Vol. IV, pages 174-177. 
Pachyzancla bipunctalis, Bur. Ent. Bull. 109-IT. 
Paleacrita vernata, Bur. Ent. Bull. 6S-II. 
Papaipema nitela, I. Exp. Sta. Bull. 95. 
Papilio polyxenes, Bur. Ent. Bull. 82-II. 
Parasites, Introduction of, Bur. Ent. Bull. 91. 
Pegomya brassicae, N. J. Exp. Sta. Bull. 200. 
Pegomya fusciceps, Bur. Ent. Cire. 63. 
Pegomya vicina, N. Y. Geneva Exp. Sta. Bull. 99. 
Pelidnota punctata, Okla. Exp. Sta. Bull. 26. 
Pemphigus bete, Wash. Exp. Sta. Bull. 42. 
Pentatoma ligata, Bur. Ent. Bull. 86. 
Peridroma margaritosa, Bur. Ent. Bull. 29. 
Periplaneta americana, Bur. Ent. Cire. 51. 
Peronea minuta, Iowa Exp. Sta. Bull. 102. 
Phlegethontius spp., Bur. Ent. Cire. 123. 
Phleophthorus liminaris, Bur. Ent. Bull. 68S-IX. 
Phlyctenia ferrugalis, N. Y. Cornell Exp. Sta. Bull. 190. 
Phorbia cepetorum, Bur. Ent. Cire. 63. 
Phorbia rubivora, N. Y. Cornell Exp. Sta. Bull. 126. 
Phorodon humuli, Cal. Exp. Sta. Bull. 160. 
Phthorimea operculella, Cal. Exp. Sta. Bull. 135, Farmers’ Bull. 120. 
Phyllotreta pusilla, Bur. Ent. Bull. 43. 
Phyllotretra vittata, Rpt. Ent. U.S.D.A., 1884, pages 301-304. 
Phylloxera vastratrix, Farmers’ Bull. 70. 
Phytonomus nigrirostis, Bur. Ent. Bull. 83—I. 
Phytonomus posticus, Utah Exp. Sta. Bull. 110. 
Phytonomus punctatus, Ill. Exp. Sta. Bull. 134. 
