18 



To further promote the end in view I W(mi](I suggest the following 

 division of the general subject : 



(!) Staple and niiscellaneous ri-(»i) insects. 



(2) Small fruit ami truck ci-op insects. 



('.'>) Deciduous fniit tree insects, including those infesting nursery stock. 



(4) ("itrus and subtropical fruit insects. 



(o) Ornamental plant and greenhouse insects. 

 (0) Shade tree and forest insects. 



(7) Insects injurious to stored foods, dwellings, clothes, books, and mis- 

 cellaneous substances. 



(5) Insects affecting man and the domestic animals. 



(0) Insects concerned in the transmission and carriage of disease. 



(10) Beneficial parasitic and predaceous insects. 



(11) Insects useful to man as furnishing food, clothing, etc 



(12) Insecticides and machinery. 



A most connnendable feature of our present-day literature is the 

 increasing amount of thorough and painstaking work on the biology 

 of in.sects. Shortly after the establishment of the several agricultural 

 experiment stations entomological i^ublications were, probably of 

 necessity, largely comj)ilations, owing to the fact that there was need 

 for placing before the public for immediate use such information 

 covering injurious species as had already been obtained. As informa- 

 tion of this character has become more and more familiar, its presen- 

 tation and repetition have become less necessary, and more original 

 Avork has been brought forth. Revised bulletins on insecticides and 

 spraying machinery nuist of necessity be gotten out from time to 

 time as progress is made along these lines, but the notable decrea.se 

 of purely compiled bulletins and papers concerning insects is a most 

 favorable indication. 



Many recent entomological publications, in the quality of subject- 

 matter, character of illustrations, and wealth of detailed observations 

 leave little to be desired. Improved facilities for careful life-history 

 work have rendered possible the many excellent pa]X'rs which are at 

 once a credit to the literature of the science and an insj^iration to 

 other workers. Careful life-history studies have been an important 

 'iieaiis of separating two or more species long held to represent but 

 one. Witness the case of the aphids designated as Aphis viali^ wliich 

 Sanderson has shown represent several species. Similarly, Morrill 

 has been able to separate Aleyrodes paekardl from Aleijnxlex rapora- 

 rwTitin. Certain species may only be distinguished by a compara- 

 tive study of their respective larval stages, as in the case of Ch'docorus 

 hhndnevus and C . s'lmUh. 



In addition to careful biologic studies of insects, the consideration 

 of life zones, of effective temperatures, and of the number of genera- 

 tions in various parts of the country, of forms Avidely distributed 

 should be given more attention than has been the case in the past. 



