38 Transactions. — Zoology. 



secretion of all Coccids appears to be chemically the same, yet 

 it is sometimes convenient to employ for separation the solidity 

 or the loose texture of the resulting covering. The " wax " 

 of Gcroplastes, the cotton of Dactylopius, and the fibrous (as 

 it seems at first sight) puparium of Mytilaspis, can all, when 

 microscopically examined, be found to be really similar in 

 their essential character. Still, it is convenient to distinguish 

 (for example) Liclitensia from Pulvinaria, or Ctenochiton from 

 Inglisia, to some extent by the form, position, or structure of 

 the secretion. I say " to some extent " because if possible the 

 main distinction of a genus or a species ought to rest upon an 

 organic character of the inseci; itself rather than upon its 

 external covering. Ccronema differs from Ccroplastes and 

 Ctenochiton in the loose texture of the test, and from the 

 latter also in the absence of a fringe ; but the secreting pores 

 of the insect itself (in the species known so far) also differ 

 from those of any other Lecaniodiaspid. 



The species herein named Prosopoplwra prosopidis is close 

 enough to P. dendrobii Douglas to be perhaps hereafter con- 

 sidered as only a variety ; but for reasons given in its descrip- 

 tion I leave it for the present as distinct. 



It appears from the synoptical list published in this volume 

 that I am responsible for more than two hundred new species 

 and varieties of Coccids reported from Australasia and the 

 Pacific, besides a large number originally named by other 

 writers and mentioned in my papers. I am sure that future 

 years will produce a very much longer list, for the study of 

 these insects is even yet only in its infancy ; but there will be, 

 I hope, no need for any one to make any important or sub- 

 versive corrections in the work which has been so far accom- 

 plished. 



Sub-family DIASPIDINiE. 



Genus Aspidiotus. 



Aspidiotus cladii, Maskell. N.Z. Trans., vol. xxiii., 1890, 

 p. 3 ; vol. xxv., 1892, p. 205 ; vol. xxvi., 1893, p. 67. 

 The first specimens of this species which have come to me 

 from New South Wales have been sent by Mr. Froggatt, on a 

 sedge, Xerotes sp., from Manly, near Sydney. I see no dif- 

 ference between them and the type. The species would thus 

 appear to be found in all parts of Australia. 



Aspidiotus longispina, Morgan. Ent. Mo. Mag., Aug., 



1889, p. 352. 



I have received specimens which, although there are slight 

 differences in the puparium, I cannot separate from Mr. Mor- 

 gan's species, on " China orange," mango, and other plants in 

 the Sandwich Islands, sent by Mr. Koebele. The charac- 



