2WS 



Memoriae de la 'Soeiedad Cientffiea 



. given by Gennadius has priority. The identity cannot 

 be definitely ascertained, however, because we have no 

 figure of the vasiform orifice, operculum and lingua of 

 A. tabaci, while the adult of A. nicotianee is unknown. 



Subgenera op Aleyrodes. 

 Ahyrod.es has been divided into several subgenera, two of 

 which are represented in Mexico, namely Trialeurpdes (with 

 A. JiJrigerontis) and Tetrakurodes with A. mori.). 



Species of Aeeybodims. 

 In the whole world, 112 species of Al-eyrodidse are known. 

 However, the group has been little studied, and probably a 

 hundred actually exist in Mexico. That species may be tabu- 

 lated thus: ^ 



Total gpacfei 



Total wpccioH in 8peciea In Mexico. 



America (North and Boufcto) (So far aa known. ) 



A leurodicus 13 12 4. 



A teyvodes 99 48 6. 



Literature. 



The following work contain accounts of the classification 

 of the Aleyrodidas; 



Signoret. Ann. Soc. Entom. France, 1867-1868. (Treate 

 chiefly of European species.) 



MaskeU. Trans. Nfew Zealand Inst, for 1895. (Treats chie- 

 fly of Australasian and Asiatic species.) 



Quaintance. Bull. 8. Tech. ser., Div. Entomology. U. S. 

 Department of Agriculture. (This is the most useful work for 

 the student of American species.) | 



CockerelL Proc. Acad. .Nat. Sci- Phila., May 1902 (Lists 

 the species of the world.) 



NOTE ON AtEYRODES ELOCCOSA. 

 Aleyrodes jtoccosa, Maskell (Trans. New Zealand Inst., 

 XXV III, p. 432) is to be added to the fauna of Mexico, as 



