Scale Insects of British Guiana. 311 



found on the stems and mid-ribs of the leaves proved to 

 be Lecanium testudo (a large brown species) and Plan- 

 chonia fimbriata (Plate II., fig. 3) of WESTWOOD. This 

 latter is a most beautiful object, ornamented with spines 

 all round the margin. Its identification taxed the abili- 

 ties of both Mr. DOUGLAS and Mr. Morgan to the 

 utmost. I believe some new things were found on 

 Cupania sap id a besides these, but I await information 

 on the point. 



Diaspis cymbidii (Plate II., figs. 4 and 5) was found 

 on mango leaves in great abundance, and both male and 

 female scales were secured. This is a very fortunate 

 find, for, as I said before, very few males of the Coccidx 

 are known to science. 



It may be many months vet before the whole of the 

 coccid mysteries received are wholly unravelled, for the 

 subject is a very difficult one ; but enough has been said 

 to show what an interesting branch of inquiry has been 

 opened up. 



What a chance is here for the young microscopists of 

 1 )cmerara to distinguish themselves! The males of 

 Vinsonia stcllifera, Ceroplastes, Isclinaspis filiformis t 

 Lecanium mangiferae, and the rest, are wholly unknown 

 to science ; and the finding of any of these, and its 

 correct representation by drawings, and mounted slides 

 sent home to Mr. Douglas, the Secretary of the Ento- 

 mological Society, would bring these aspirants for 

 honour into note at once. 



In order to help them I will state what is the history 

 of a coccus, no matter what species. The adult female 

 dies, and leaves beneath her a heap of eggs, duly hatch- 

 ing out into active larvae, which run all over the plant 



