August, '10] DAVIDSON: CALIFORNIAN APIIIDIDAE 381 



plete bibliography of the family, it is unnecessary to publish such a 

 list here. The following works, however, may be cited as dealing 

 particularly with western species: 



A List of California Aphidida?, W. T. Clarke. Can. Ent., Vol. 35. 



Host-plant List of North American Aphididae. T. A. Williams. 

 Univ. Nebraska Special Bulletin No. 1. July, 1908. 



Orchard Plant-lice and Their Remedies. C. P. Gillette and E. P. 

 Taylor. Exp. Station of the Colo. Agr. Coll. Bull. 134. Sept., 1908. 



A Few Orchard Plant-lice. C. P. Gillette and E. P. Taylor. Colo. 

 Exp. Station Bull. 133. 



Chermes of Colorado Conifers. C. P. Gillette. Proceedings of 

 the Academy of Natural Sciences of Philadelphia. Jan., 1907. 



Biological Studies in Three Species of Aphididae. J. J. Davis. • U. 

 S. Dept. of Agr., Div. Ent., Technical series Bull. 12, part 8. Feb., 

 1909. 



Two new genera and species of Aphidids. J. J. Davis. Annals of 

 the Ent. Society of America, A^ol. II, No. 3. Sept., 1909. 



Studies in Aphididae I & II. J. J. Davis. Annals of the Ent. 

 Society of America, Vol. I, No. 4 ; and Vol. II, No 1. Dec, 1908. 



Aphididfe of Southern California. E. 0. Essig. Pomona Journal 

 of Entomology, Vol. 1, Nos. 1 & 4. 



Notes on AphididiB collected around Stanford Uinversity. W. M. 

 Davidson. Journal of Econ. Ent., August, 1909. 



Scientific Notes 



Elm leaf beetle (Galcrucella luteola Mull.). This species was unusually 

 abundant and destructive in the upper Hudson Valley, being very injurious 

 from Poughkeepsie north to Cohoes, Stillwater and Greenwich. A record of 

 serious injury, accompanied by numerous specimens, was also received from 

 Mr. Frank T. Clark of Ticonderoga, N. Y. This is the northernmost record 

 for serious injury by this beetle in the state of New York. 



Snow-white linden moth {Ennomos siihsujnarhis Hubn.). This insect has 

 continued its depredations of the last two years in the Catskills, though the 

 defoliated area is probably not so extensive as in 1909. There has been a 

 marked falling off in the numbers of moths observed at lights in cities and 

 village along the Hudson River, if one may accept as safe criteria, local 

 newspaper notices supplemented by personal observation. 



E. P. Felt 



