ALEURODICUS PULVINATUS. 67 
and it was later referred to this genus by Cockerell. The original 
description and remarks by Maskell follow: 
Larva not observed. 
Pupa-case dark orange, with two broad lateral longitudinal bands of dark- 
brown, which do not touch the margin, and which denote the inclosed insect. 
Form roundly elliptical, the cephalic extremity sometimes slightly depressed : 
dorsum slightly convex; abdominal segments moderately distinct. Length about 
1/20 in. The dorsum bears, some distance within the margin, a series of 
twenty-two tubercular pores, glands or spinneret orifices. Of these, four on 
the extreme cephalic region are small, with simple circular orifices; the next 
two (one on each side), on a level with the rostrum, are large and conspicuous, 
consisting of a cylindrical tube with wide circular orifice; the next four (two 
on each side) on the median thoracic region are rather small, but larger than 
the anterior cephalic ones and have circular multiocular orifices; the next 
eight (four on each side) on the abdominal region are similar to two large 
ones near the rostrum; the last four (two on each side) near the abdominal 
extremity are about equal in size to the four on the cephalic region, and are 
simple. The margin is very finely striated, but not crenulated; and for some 
distance within it the dorsum is covered with great numbers of very small 
circular spinneret orifices, but these do not extend to the median dorsal regions. 
There is no fringe, properly speaking, but all the organs just described produce 
secretion as noticed presently. Yasiform orifice rather broader than long, the 
anterior edge slightly concave, the posterior edge broadly convex ; operculum 
small, covering about one-third of the orifice, with both edges concave, the 
anterior very deeply, the posterior less, depressed ; lingula very long, extending 
some distance from the orifice, roundly conical, with two rather long setae near 
its end. 
The spinneret tubes and orifices above mentioned secrete a large quantity of 
snow-white waxy threads closely felted, and also, scattered amongst these, 
several long straight glassy rods, which are very brittle; these rods, when 
closely examined, are seen to be very delicately fluted. The threads appear to 
be produced from the very numerous minute spinnerets, and the rods from the 
rows of larger tubes. It results from the absence of small spinnerets on the 
median dorsal regions that the pupa case in those parts is uncovered; conse- 
quently, it appears as if lying on a thick ring or cushion of cotton, from which 
fact I have derived its specific name. 
On turning over the pupa case and dissolving the waxy matter, the rudi- 
mentary feet and antennae are clearly visible; the feet are thick and short, the 
antennae rather long, slender, and in the latest stage numerously ringed. 
Adult form unknown ; but from the appearance of the rudimentary wings in a 
late pupa examined, which was almost on the point of emerging when it died, I 
believe that the fore-wings will be dark and banded with dark-brown, or perhaps 
black. 
Hab. In Trinidad, West Indies. My specimens were sent by Mr. F. W. Urich. 
I think the plant is Jatropha sp. 
It has been necessary to be particular in describing and figuring the details 
of spinnerets, etc., in this species, on account of its similarity in some respects 
to three West Indian insects: Aleurodicus anonce, Douglas and Morgan; A. 
cocois, Curtis, and A. ornatus, Cockerell. I have already, in my introductory 
remarks, mentioned that these and other authors employ frequently the term 
" larva " to denote indiscriminately what I take to be both the larval and the 
pupal states. Now, first, as to color : the " larva " of A. anonw is said to be 
"ochreous," that of A. cocois (as far as I can make out) is similar; that of 
