1903.] H. W. Peal — Monograph of the Oriental Aleurodidse. 93 



anterior thoracic region, another transverse row of four on the anterior 

 abdominal region, a longitudinal row of four on each side of the abdo- 

 men, and one on each side of the vasiform orifice. Vasiform orifice sub- 

 conical, the posterior extremity slightly produced ; operculum short, 

 rounded, subconical ; lingula cylindrical at the base, afterwards widened, 

 finally tapering, not quite reaching the edge of the orifice. 



Pupa-case very dark-brown or glossy-black ; very elongated, ellipti- 

 cal, with sides nearly straight, the width only about one-third of the 

 length. Dorsum sometimes slightly convex, sometimes flat, sometimes 

 slightly concave ; abdominal segments indistinct. Vasiform orifice ap- 

 parently as in the larva, but difficult to make out on account of the very 

 dark colour of the case. Margin crenulated and bearing a very elegant, 

 long, snowy-white fringe of slender waxy cylindrical tubes. There is 

 frequently some white powdery meal on the dorsum, which probably 

 bears pores as in the larva, but it is most difficult to detect them. The 

 ventral surface is flat, brown ; the rudimentary organs are not distinct, 

 owing to the dark colour. 



Adult form unknown. 



Sab. In India, on Saccharum officinale. My specimens were sent 

 by Mr. Cotes, late of the Indian Museum, Calcutta, from Baroda. He 

 informed me they were rather damaging to the sugarcane in those 

 parts. 



The very elongated form is distinctive, besides the black colour. 



Aleurodes cotesii, Maskell. 



Transt., N.Z. Inst, Vol. XXVIII, 1895, p. 427, Ind. Mus. Notes, 

 Vol. IV, No. Ill, p. 145. 



Larva yellow, the median region darker than the margin ; form ellip- 

 tical ; length about one-fortieth in. In the earliest state only very faint 

 indications of the insect itself appear, and the whole is very thin and 

 flat; later on the enclosed future pupa begins to be visible, and the vent- 

 ral surface becomes more convex ; the eyes also appear. The larval 

 integument becomes too small for the growing insect, and splits longi- 

 tudinally ; and in the early pupal state it may be seen attached 

 along the dorsal edges of the pupa-case. Margins somewhat thickened, 

 the adjacent tubes forming minute crenulations, and within it the dorsum 

 bears numbers of very small circular pores ; from these and from the 

 marginal tubes is produced a quantity of white waxy matter, some of 

 which covers the dorsum in scattered patches, and the rest spreads 

 round the larva in a very long fringe of delicate threads, frequently much 

 longer than the insect itself ! This waxy matter is very brittle, and, as 

 a rule, the whole surface of a leaf is powdered over with the fragments, 

 making the leaf look as if mildewed. 

 J. ii. 14 



