HOMOPTERA 



FAM. ALEYRODID^ 



by A. L. QUAINTANCE 



WITH 2 COLOURED PLATES 



HE Aleyrodidœ occupy a systematic position between the Aphididae and Coccidae, and in 

 the immature stages are at times mistaken for members of these famihes, and of the 

 PsvlUda. Upon careful examination, however, characteristic structures will be found, by 

 which the members of the Ahyrodidee ma}' be positively identified. While the bibliography 

 of tliis family is fairly extensive, the earlier writings are of comparative!}- little importance from a 

 systematic standpoint. Prior to Latreille, the insects were referred by writers to such genera as Tinea, 

 Plueleua, Chermes, etc. The genus Aleyrodes was established by Latreille (i) and was placed with the 

 Aphidida, to which family it was subsequently referred and to the Coccidœ by various writers until 1840. 



Westwood (2), in 1S40, in reviewing the genus established the family Aleyvodidœ, the then single 

 genus Aleyrodes constituting the type genus. Signoret (3) gave the first comprehensive revision of the 

 family in 1867, in Mi^ Essai monographique sur les Aleurodes, in which 23 species were treated, six being 

 described as new. This valuable paper has constituted the principal basis for subsequent workers. 



In 1892, the genus Aleiirodictis was erected by Douglas (4) for a species from Demerara, described 

 as aiwna, by Morgan, who also transferred to the new genus the Aleyrodes coccois of Curtis, also from 

 Demerara. Maskell (5) in 1896, catalogued the species of the world, giving descriptions of 22 new 

 forms, bringing the number up to 66, four belonging to Aleurodicus. The American species were 

 treated by the writer (6) in igoo, 52 being listed, 18 of which were described as new. In 1902, 



(1) Mag. Kncycl. Vol. 2, p. 304 (1795); Précis des Caractères des Insectes, p. 93 (1706I; Gen. Crust, et Ins. \ ol. 3, p. 173 (1807). 



(2) Modem Classification of Insects, Vol. 2, p. 442 (1840). 



(2) Essai Monographique sur les Aleurodcs, Ann. Soc. Ent. Kr. (4), Vol. 8. p. 3ft9-402 (i8ô7). 



(4) Ent. Mo. Mag. (2), Vol. 3, p. 29-33 (1892). 



(5) Contributions toward a monograph of the Aleurodidae (Ttäns. New Zealand Institute, \'ol. 28. p. 411-449 (i8q5). 



(6) Contributions toward a monograph of the American Aleuroiidne (Bull. 8, Tech. Ser. Uiv. Ent. U. S. Dept. Agri. Washington, p.9-48 (JOOoL 



