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Further Notes on Some Coccids from British Guiana. 



By S. J. McIntire, F.R.M.S. 



{Bead December 28th, 18S8.) 



Plate XXVI. 



With reference to a former communication in which I had the 

 pleasure to read some letters from J. W. Douglas, Esq., F.E.S., 

 upon certain coccids found by him on mango and orchid leaves from 

 the Botanic Gardens, George Town, British Guiana, I followed up 

 the subject by forwarding a piece of a mango-leaf and asking what 

 the curious orthezia-like bodies upon it were. These curious clusters 

 were the objects which had puzzled Mr. Jeninan, the head of the 

 Gardens, so much that he was glad when my friend Ward suggested 

 that some leaves should be sent to me, and authorized him to take 

 action accordingly. 



Mr. Douglas replied as follows, sending me back the fragment 

 of leaf on which he had found something which had escaped my 

 notice : — 



M The scales on the bit of mango-leaf (herein returned) are of 

 the same kind as I found on one of the leaves received before — the 

 male of a Diaspis, or Chionaspis — which I cannot determine with- 

 out seeing the female scales (perhaps not then as to species). The 

 Diaspis (female) has a more or less circular scale ; the Chionaspis 

 an elongated or oval one." 



11 On the bit of leaf enclosed you will see a very narrow black 

 coccid scale. This I have had on many plants from the Royal 

 Botanic Society's Garden, Regent's Park, and described it in the 

 1 Entomological Monthly Magazine ' as Ischnaspis jiliformis" 



I have drawn both these coccids. The Diaspis or Chionaspis 

 scales form white patches on the leaves, often of considerable size ; 

 and in one or two places I have detected the imago, but I failed to 

 remove it successfully to a slide, owing to its fragility. 



The finding of Ischnasjris is interesting, as its native habitat was 

 not previously known. So says Mr. Douglas, (" Entomological 



Journ. Q. M. C., Series II., No. 24. 27 



