ALEYRODIDS OF (ATJFOnXrA—JlEMTS. 487 



I. ALEYRODES IRIDESCENS, new species. 

 Plate XXYTI, figs. l-2a. 



^(/(/. — Yellowish brown, slightly curved, unmarked; pedicel short 

 at one side of base on the convex curve. 



Larm. — (Stage 1.) Size, about 0.25 I)}- 0.11 mm.; elliptical: pale 

 yellow. Dorsum with a narrow, thickened, uncrenulat(>d marginal 

 rim which bears a series of nine pairs of short, delicate hairs set in 

 conical ])ase; three of these seven pairs are lateral and extend from 

 the latero-cephalic margin about one-half the length of larva; the 

 remaining two pairs are the usual caudal and latero-caudal hairs; 

 besides these there are five pairs of long, tapering, hollow, dorsal 

 spines, a pair on cephalic segment, a pair on the meso-thorax, a pair 

 on the raeta-thorax, a pair just within the caudal marg-in, and a pair 

 of delicate tubercled hairs caudad of the cephalic margin. Yasiform 

 oritice, subcircular, minute; operculum the same shape and filling- the 

 orifice; lingula minute, barely visible through the operculum. 

 Mouth parts large, set* more than one-half the length of the insect. 

 Eye-spots red, divided, the posterior lobe round and the larger of the 

 two. Legs and antennte functional. 



Larva. — (Stage 2.) Abdominal segments distinct along- dorsi-meson ; 

 two crescent-shaped thickenings in tergum, cephalad of the vasiform 

 oritice. Lateral hairs, dorsal spines, eyespots. legs and antenna? liave 

 disappeared. In other respects as in Stage 1. 



Larva. — (Stage 3.) The more cephalic of the flattened iilaments of 

 each stellate whorl of the dorsal exudation much longer than the 

 others. Smaller than the pupa-case, in other respects the same. 



Puj)a-case.—ljQ,r\^th, 1.2 mm.; width, 0.7 mm. ; elliptical, somewhat 

 narrow caudad. Color, on leaf, under hand lens, shining black; under 

 microscope, by reflected light, it shows a most exquisite iridescence. 

 The case is flat upon the leaf and has neither lateral nor ventral secre- 

 tion, ])ut there is a long, downward-curving fringe from a series of 

 pores near the mesal border within the marginal rim, made up of 

 separate, tapering, transparent rods which are more than one-half the 

 width of the case. In dry specimens the rods are often joined together 

 at the base, thus making a continuous fringe. The most striking- 

 characteristic of this species is the arrangement of the dorsal exuda- 

 tion in stellate whorls of filaments or flat rays, which form a l)eautiful, 

 flower-like pattern repeated many times in four longitudinal, sub- 

 parallel lines, the outer pair of which correspond to the shape of case 

 and contain twenty-four whorls, much larger than those of the inner 

 lines; the inner lines have about twent}^ whorls each; along the 

 abdominal keel the latter are so close together that the whorls are 

 massed, foiining a single line. Dorsum flat, with a longi-medial 

 keel, which is rounded on the abdomen and sharply ridged from there 



