206 ASSOCIATION OF ECONOMIC ENTOMOLOGISTS. 



Page. 



Weather conditions, study, in forecasting abundance of insects 91 



Webworm, fall. (See also Hyphantria cunea and Hyphantria textor.) 



observations on migrating, feeding, and nesting habits 41-51 



Webworms. (See Crambus vulgivagellus.) 

 Weevil, Xew York. (See Ithycerus noveboracensis.) 

 Weevils. (See Calandra granaria and Calandra oryza.) 



Wheat , food plant of Isosoma sp . 71 



Mayetiola destructor 71, 81 



Nysius.sp . 69 



Toxoptera graminum . 67 



injured by rust _ ■ 71 



midge. (See Contarinia tritici.) 

 White grubs. (See also Lachnosterna.) 



injury to grass in Xew York 90 



Willow borer. (See Cryptorhynchus lapathi.) 



food plant of Cryptorhynchus lapathi 74 



Malacosoma disstria 79 



Wing origin and insect phylogen v 29 



Winthemia quadripustulata, sulphur dioxide as insecticide 145 



Wood products (staves of ice-cream freezers), injur}- by Dermestes vulpinus 76 



Woolly aphis. (See Aphis, woolly, and Schizoneura lanigera.) 

 currant. (See Schizoneura fodiens.) 

 maple-leaf aphide. (See Pemphigus acerifolii.) 

 scale. (See Phenacoccus acericola.) 



Yellow fever, and other insect-borne diseases, symposium 2S 



Federal control. 101, 102, 105 



in Connecticut in 1794, probable origin. 24 



mosquito. (See also Stegomyia calopus.) 



resolution praying Federal extermination 102 



sulphur dioxide in control ^ 150 



Yucca jilamentosa, fertilization IS 



o 



