Maskell. — On Aleurodidae. 413^ 



exceedingly like Coccida ; so like that even an entomologist 

 requires close examination to detect the differences. Gar- 

 deners, therefore, and collectors, and museum authorities, 

 and others, not pretending to exact knowledge of the Honio- 

 ptera, finding plants covered perhaps with a multitude of scale- 

 like insects, and not connecting them with the little white 

 flies hovering over the branches, send them for identification 

 as Coccidc?, and it is almost impossible within reasonable time 

 to procure from the collectors the adults, which, indeed, they 

 can scarcely recognise. 



5. Probably the best means by which one could arrive at 

 some knowledge of the adults is the publication of such a 

 paper as the present one as a guide to collectors. 



The foregoing reasons seem to me sufficient to explain my 

 motive in this paper." 



Bibliography. 



The following list contains the names of all the authors 

 who have treated of the Aleurodidcs, as far as I am aware, 

 omitting such brief notices as may be found scattered in 

 publications like the Entomologist, Gardeners' Chronicle, 

 Insect Life, Sec, not containing scientific descriptions or 

 observations. With regard to the years 1894 and 1895, the 

 information available to me is not yet complete. As regards 

 early writers, such as Eeaumur, Linnaeus, Geoffroy, &e., it is 

 to be noted that they class these insects under such varied 

 genera as Papilio, Tinea, Chermes, &c. : — 



llAO{sbboVit).Ec'mimur, Memoires, torn, ii., mem. 7. 



1764. Geoffroy, Hist. abr. des Insectes, p. 509. 



1764-90. Linnceus, Syst. Nat. ; and Earner, Notiz. 



1795-1807. Latreille, Mag. Eneycl., tom. ii., p. 304; and 

 Genera Ins., tom. iii., p. 174. 



1800-30. Tigny, Walckenaer, Kirhy and Spence ; observa- 

 tions of no special importance. 



1801. Schrank, Fauna Boica, ii., 1, 147, 1273. 



1829. Stephens, Catal. of Brit. Ins., p. 267. 



1883. Donhleday, Entom. Mag., vol.^i., p. 313. 



1835. Haliday, EiXitom. Mag., vol. ii., p. 119. 



1835. Burmeister, Handb. der Entom., tom. ii., p. 82. 



1840-41. Blanchard, Ins. Voyage to Chih, p. 319. 



1840. Westwood, Introd. to Mod. Class, of Ins., vol. ii., 



p. 442. 



* In the Entomologists' Monthly Magazine for August, 1895, is an 

 article by Mr. J. H. Diirrant, F.E.S., entitled " A Protest against giving 

 Names to the Preparatory Stages of Insects." Whatever may be the 

 force of the argument therein as to the Lepidoptera, Diptera, Hvmeno- 

 ptera, and Coleoptera, I venture to think that an exception may be made as 

 to the Homoptera. 



