ALEURODICUS PULVINATUS. 67 



and it was later referred to this genus by Cockerell. The original 

 description and remarks by Maskell follow: 



liUrva uot observed. 



Pupa-case dark orauge, with two broad lateral longitudinal bauds 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 s]>iuneret 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 creuulated ; 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. Vasiform 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 i3oint 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 anon<e, 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. anonce is said to be 

 "ochreous," that of A. cocois (as far as I can make out) is similar; that of 



