1903.] H. W. Peal — Monograph of the Oriental Aleurodidse. 87 



side of the mesio dorsal ridge on the 5th segment. A pair of short stout 

 spines placed, one on each side of tho vasiform orifice. Two long setoa 

 candad and two cephalad on margin. The vasiform orifice is situated 

 on a short tubercle at the posterior end of the mesio dorsal ridge. Shape 

 oval. Operculum similar in shape but somewhat smaller, the lower 

 half apparently slightly ridged. Lingula indistinct, shape rectangular, 

 broader than long. It is completely covered by the operculum. 

 Adult form unknown. 



This Aleurodid occurs plentifully on various species of bamboo in 

 the vicinity of Calcutta. As a rule only a few leaves in a bamboo clump 

 are attacked by the insect. I have, however, sometimes found it occur- 

 ring in very large numbers in some bamboo clumps. It then undoubt- 

 edly is a rather serious pest as frequently most of the leaves are then 

 killed. The insect is kept in check by a parasite, presumably a chalcid, 

 as large numbers of dead insects can always be found which have the 

 minute hole on the dorsum made by the parasite for its exit. I have 

 so far obtained no specimens of the parasite. When this aleurodid is 

 detached from the leaf it will be observed that the portion of the leaf 

 beneath the insect is yellow and discoloured. As a rule the exuviae of 

 the preceding stages remains attached to the spines on the dorsum. 



Aleurodes leakii n. sp. Plate V, Figs. 4-5. 



I obtained specimens of this insect off both Natal (I. arrecta) 

 and ordinary indigo (Indigofera tinctoria) at Dalsing Serai, Behar, in 

 the month of May 1902. As seen with the naked eye the pupae and 

 larvse are yellowish in colour. I noticed one peculiarity with regard to 

 this species ; the scales invariably occur on the upper surface of the 

 leaves. This is rather an unusual feature. The insect itself was not 

 common enough to constitute a pest. It may possibly however at other 

 times of the year be present in larger numbers and so prove a factor 

 amongst the numerous insect pests indigo has to contend with. I have 

 found it to be far commoner on Natal than on ordinary indigo. Consid- 

 ering that in the future the Natal plant will almost certainly be grown 

 to a large extent owing to its superiority over the ordinary indigo the sup- 

 pression of this pest may at some time have to be taken in hand. The 

 scales themselves as a rule occur rather sparsely, two or three on each 

 leaflet. I have however occasionally fouud them in fairly large num- 

 bers on single leaflets. 



Egg. Size *2 mm. x '1 mm. 



Colour yellowish brown. The egg is attached to the leaf in an up- 

 right position by a short peduncle or stalk. 



Larva probably 2nd stage. Size 1*05 mm. x "76 mm. 



Shape elliptical ; colour whitish-yellow, a few yellowish-brown 



