430 Transactions. — Zoology. 



small tubercular papillae, set rather closely together ; from 

 these spring moderately long, curling, white waxy cylinders, 

 which are extremely brittle, and therefore frequently broken 

 off. "Within this series the dorsum has eight large circular 

 orifices, two on the cephalic, four on the thoracic, and two on 

 the abdominal regions. Yasiform orifice elongated, conical, 

 with emarginate sides, and a deeply bifid apex ; operculum 

 elongated, conical, with emarginate sides, and end rounded ; 

 lingula moderate, extending a little beyond the operculum, 

 its outer end clavate and emarginate. Eyes red, reniform ; 

 after treatment with reagents they appear fluted at the base. 



Adult form unknown. 



Hab. In Mexico, on Erigeron sp. My specimens were 

 sent by Mr. T. D. A. Cockerell. 



This species is closely allied to .4. nicotiance, described 

 below ; but differs in the number and arrangement of the 

 large dorsal orifices, in the vasiform orifice, and in the absence 

 of lateral depressions. 



22. Aleurodes eugenise, Maskell, sp. nov. Plate XXIX.- — 1. 



Larva dull-white or grey, or slightly yellowish ; form 

 roundly elliptical, the anterior edge very shghtly compressed; 

 dorsum scarcely convex; length about J^jii^i- Dorsum marked 

 with very delicate radiating striae. Margin without either 

 fringe or hairs, and not at all thickened, but finely fluted 

 and minutely crenulated. Three marginal depressions and 

 radiating dorsal patches as described below in the pupa. 



Pupa-case very pale yellow, or greyish ; dorsum very 

 slightly convex; form roundly elliptical or subcircular ; length 

 about Jfyin. as a rule, but reaching J^in. The enclosed pupa 

 is conspicuous dorsally, dark-brown, the segments fairly dis- 

 tinct ; on turning over the case the rudimentary feet may be 

 made out rather confusedly, and the antenna more faintly. 

 Dorsum of the ease marked with radiating striae, more clear 

 than those of the larva : these striae are most conspicuous 

 near the margin, which is not at all thickened, nearly entire, 

 but marked with narrow but deep channels dividing it into 

 broad segments. At three points in the margin there are 

 small concave depressions, one at each side opposite the 

 rostrum, and one at the abdominal extremity. Corresponding 

 with these, on the dorsum, are three very faint radiating 

 dotted patches : when viewed by transmitted light, these 

 patches are seen to be formed of a lace-hke pattern, with 

 small irregular cells, and at their extremity they end in a 

 circular orifice deeply crenulated ; the anterior pair extend 

 from the rostrum to the margin, the posterior one from the 

 vasiform orifice to the margin. Vasiform orifice with straight 

 anterior edge, sides and end regularly convex ; operculum 



