Maskell. — On Aleurodidae. 415 



1895. Douglas, Ent. Mo. Mag., vol. xxxi., pp. 68, 97, 117. 

 1895. Leivis, Journ. Quekett Micr. Club, p. 88. 



Mention must also be made of a paper by Dr. Siguoret 

 (Ann. de la Soc. Entom. de France, 1879), in which the author 

 estabhshes a new genus Spondijliaspls, containing three species, 

 from Queensland, Australia, which he proposes to attach to 

 the Aleurodidcd. But there is no doubt that these insects 

 belong to the family PsyUidcB, and are closely allied to some 

 which are described by Dobson in the "Proceedings of the 

 Koyal Society of Tasmania," 1850 (vol. i., 1848-50, p. 235 et 

 seqq.). Drawings of the waxy coverings of these insects and 

 of pupte sent to me by Dr. Signoret in 1882, and compared 

 both with Mr. Dobson's figures and with actual specimens 

 from Australia in my cabinet, satisfied me on this point, and 

 .Dr. Signoret subsequently agreed with me. In Insect 

 Life, 1893, p. 219, Messrs. Riley and Howard say that 

 Spondyliaspis was "afterwards found to fall before Maskell's 

 Inglina [misprint for Inglisia] , erroneously supposed by the 

 latter to belong to the CoccidcB." There is not the shghtest 

 doubt that Inglisia is a Coccid, and it is not at all similar in 

 any respect to Spondyliaspis. The sentence just quoted is 

 regrettable. 



Order HEMIPTERA. 

 Sub-order HOMOPTERA. 

 Family ALEURODID^. 



Insects infesting plants ; furnished in the adult state with 

 four wings in both sexes ; possessing also in the adult state in 

 both sexes rostra and digestive organs. Eyes sometimes en- 

 tire, sometimes divided, but more usually reniform, with a 

 larger and a smaller segment, of which the smaller is anterior ; 

 antennoB of seven joints ; feet with dimerous tarsi terminated 

 by three claws, of which one is smaller than the other two. 

 Eggs with a short peduncle or stalk. 



The wings of the adults are usually covered wdth more or 

 less of a white powdery matter, from which the name of the 

 family has been established {ak^vpov = floiir). 



It has already been observed that there is little difference 

 amongst the adults of this family, except as regards the wings, 

 which in some species are immaculately white and in others 

 more or less spotted, patched, or banded. The minute dis- 

 tinctions, which may be detected by close examination, in the 

 relative lengths of the antennal joints or of the feet, or in the 

 divisions of the eyes, seem to be unimportant ; and the colours 

 of the bodies, which vary somewhat with the age of the 

 specimens, may perhaps be looked on as often subject to the 



