December, '12] HEADLEK: ENTOMOLOGICAL INVESTIGATIONS 483 



168. Shade and forest tree insects. 



Data have been accumulated to show that on the more valuable trees hickory 

 bark borer may be destroyed by use of insecticides after the females have 

 entered the trees. 



169. The effect of petroleum on dormant trees. 



New York, Cornell University, Ithaca, — Glenn W. Herrick. 



170. Investigation of clover pests with means of control. 

 Just begun. 



171. Investigation of the Ufe histories of insects injurious to hops with methods 

 of control. F. W. Pettey in immediate charge. 



Just begun. 



Ohio, Wooster, — H. A. Gossard. 



172. Peach and apple orchard spraying and its effect on insect pests. 



173. Collections and exhibits. 



174. Miscellaneous Ufe histories. 



175. Mill fumigation. 

 Much data accumulated. 



176. Efficiency of different spraying nozzles. 

 Progress substantial. Bulletin now in press. 

 Utah, Logan.— E. G. Titus. 



177. Arsenical poisoning of fruit trees. 

 Well along. 



West Virginia, Morgantown, — W. E. Rumsey. 



178. The control of the apple and peach tree borers. 

 Progress satisfactory. 



Taxonomic Directory 

 Thysanoptera 



W. E. Hinds, Auburn, Ala., will classify for privilege of retaining duplicates and of 

 naming and describing the new species. 

 Mallophaga 



V. L. Kellogg, Stanford University, Cal., will classify when sendings are of sufficient 

 size to make probable the discovery of new species, or of interesting new records of 

 distribution, and when in small lots if material has been taken from unfamiliar birds, 

 or from birds of the remote geographical regions. 

 Orthoptera 



B. H. Walden, New Haven, Conn., will classify in so far as other work will permit. 

 Memhracidxje, Jassidce., Cercopidce and Fulgoridie. 



Z. P. Metcalf, West Raleigh, N. C, will classify for permission to retain new and 

 unusual forms for further study, and to dispose of a fair number of such forms as he 

 may see fit. 

 JassidcE 



E. D. Ball, Logan, Utah, will classify North American forms under the usual condi- 

 tions. 

 Aphididce 



C. P. Gillette, Fort CoUins, Colo., will classify provided data on food plants and 

 date and location of capture are furnished, and the privilege of retaining the speci- 

 mens of special interest when there are duplicates. 



Aphididce and Psyllidce 



Edith M. Patch, Orono, Maine, will classify on receipt of mature material in good 

 condition with record of food plant accurately determined on which the species 

 developed. 



