170 Transactions. — Zoology. 



Pig. 13. i^/iwiocoZa/Mc/iSifc, adult male, dorsal view. 



Pig. 14. „ head of adult. 



Pig. 15. „ forewing. 



Fig- IG. „ genitalia of female, dorsal view. 



Fig- 17. „ „ side view. 



Pig. 18. „ antenna of adult. 



Pig. 19. „ genitalia of male, side view. 



Fig. 20. „ genital processes of male, ventral view. 



Pig. 21. „ pupa, dorsal view. 



Pig. 22. „ head of pupa. 



Fig. 23. „ antenna of pupa. 



Pig. 24. „ abdominal spines of pupa. 



Fig. 25. „ anal ring of pupa. 



Art. XVIII. — On some Aleurodidoe from Nciv Zealand 



and Fiji. 



By W. M. Maskell, F.E.M.S., Corr. Mem. Eoyal Society 



of South x\ustralia. 

 [Read before the Wellington Philosophical Society, 2nd October, 1889.] 



Plate XIII. 



The Aleurodidce are a family of homopterous insects which 

 may be considered as intermediate between Coccididce and 

 AjjhidcB. From both (as also from Psyllidce) they differ in 

 their divided eyes ; from Coccids they are easily distinguished 

 by the presence in the adults of both sexes of four wings ; 

 from Aphides they differ in the characters of their younger 

 stages, and by the form and venation of their wings. 



These insects are almost all very minute. The adults fly 

 somewhat vigorously, and sometimes in summer may be seen 

 hovering in clouds round trees. Their name is derived from 

 the coating of white floury meal (dXei'poi' = flour) with which the 

 wings in most species are covered. The larvae and pupae are 

 always attached to plants ; and in these states it is difficult at 

 first sight to distinguish them from Coccids. Indeed, the form 

 of an orifice situated near the abdominal extremity is about 

 the only mark by which, in many cases, to identify an 

 Aleurode pupa. Many of these pupa? are fairly thick and 

 easily seen, but many others are so thin and translucent that 

 when dry they can scarcely be detected on a leaf, and 

 when wetted by rain or otherwise become quite invisible. 

 They are very commonly mistaken' for Coccids. I have fre- 

 quently had them sent to me as such, and in 1878 I included 

 two of them, under the generic name of Astcrocliiton, amongst 

 Coccids("Trans. N.Z.Inst. ,"1878, vol. xi., p. 214). It requires 

 examination under a strong lens or a microscope to make out 



