( ^li ) 



OsBOHN (Herbert). Leaf -hoppers affecting Cereals, Grasses, and Forage 

 Crops. 

 [U. S. Dept. Agric, Bureau Entom., Bull. No. 108, 1912.] 



U. S. Dept. Agric. 

 Pagenstechee (A.). [See Lepidopterorum Catalogus.] 

 Pahbot (P. J.). The Pear Thrips. 



[N. Y. Agric. Exper. Station, Bull. No. 343, 1912.] 



N. Y. Agric. Exper. Station. 

 Patch (Edith M.). Aphid Pests of Maine. Food Plants of the Aphids. 

 Psyllid Notes. 

 [Maine Agric. Exper. Station, Orono, Bull. No. 202, 1912.] 



Elm Leaf Curl and Woolly Apple Aphid. 



[Maine Agric. Exper. Station, Orono, Bull. No. 203, 1912.] 



Ifaine Agric. Exper. Station. 



[See JOHANNSEN (O. A.).] 



Patton (W. S.) and Strickland (C). A Critical Review of the Eolation of 

 Blood-sucking Invertebrates to the Life Cycles of the Trypano- 

 somes of Vertebrates, etc. 

 [Parasitology, Vol. I, No. 4, 1908.] The Authors. 



Pennsylvania Health Bulletin. Insects. 



[Pennsylv. Health Bull., Harrisburg, Pa., No. 32, Feb. 1912.] 

 Pennsylv. State Dtpt. of Health. 

 Pergande (Theo.). The Life-history of the Alder Blight Aphis. 



[U. S. Dept. Agric, Bureau Entom., Techn. Ser., No. 24, 1912.] 



V. S. Dept. Agric. 

 Pfitzner (R.). [See Lepidopterorum Catalogus.] 

 Phillips (E. F.) and White (G. F.). Historical Notes on the Causes of Bee 



[U. S. Dept. Agric, Bureau Entom., Bull. No. 98, 1912.] 



U. S. Dtpt. Agric. 



(W. J.). [See Webster (F. M.).] 



(W. J.) and Davis (J. J.). Studies on a New Species of Toxoptera, 



with an Analytical Key to the Genus and Notes on Rearing 

 Methods. 

 [U. S. Dept. Agric, Bureau Entom., Techn. Ser., No. 26. Pt. I, 

 1912.] U. S. Dept. Agric. 



Pic (Maurice). [See Coleopterorum Catalogus.] 



Pierce (W. Dwight). Systematic Notes and Descriptions of some Weevils 

 of Economic or Biological importance. 

 [Proc. U. S. Nat. Mus., Vol. XLII, 1912.] 



The Smithsonian Institution. 



[See Wytsman's Genera Insectorum.] 



and Cushman (R. A.), Hood (C. E.), and Hunter (W. D.). The 



Insect Enemies of the Cotton Boll Weevil. 

 [U. S. Dept. Agric, Bureau Entom., Bull. No. 100, 1912.] 



U. S. Dept. Agric. 

 PoPENOE (C. H.). Insects injurious to Mushrooms. 



[U. S. Dept. Agric, Bureau Entom., Circular No. 155, 1912.] 



U. S. Dept. Agrie. 

 Poppius (B.). [See Reuter, O. M.).] 



Porter (Carlos E.). Estudios Elementales de Zoolojia. Introduccion al 

 estudio de los Miriopodos. Santiago de Chile, 1911. 



The Author. 

 Pbout (Louis B.). [See Wytsman's Genera Insectorum.] 



[See Sherborn (C. D.).] 



Quaintanck (A. L.). Notes on the Peach Bud Mite, an Enemy of Peach 

 Nursery Stock. 

 [U. S. Dept. Agric, Bureau Entom., Bull. No. 97, Pt. VI, 1912.] 



