NO. 2156. SUBFAMILY ALEYRODINAE—QUAINTANCE d BAKER. 381 



extending from the caudal edge of the orifice to the margin of the 

 case. The thickened area on either side of this channel ends on the 

 margin in two narrow irregular lobes. These differ from the corre- 

 sponding lobes of iridescens in extending to the margin or a Uttle 

 beyond it. The color under the microscope is a very dark brown. 



On the leaf the pupae appear as black disks without waxy secre- 

 tion, excepting short pencils of wax from the pores of the tracheal 

 folds. 



Adults. — Unknown. 



Described from pupa oases in balsam mounts and upon the foliage. 



Type.— Cat. No. 20205, U.S.N.M. 



Genus ALEUROPLATUS Quaintance and Baker. 



Aleuroplatus, Quaintance and Baker, Tech. Ser. 27, pt. 2, Bur. Ent. U. S. 

 Dept. Agr., 1914, p. 98. 



Pupa case usually flat, elUptical, oval, or subcircular in outline, 

 often notched on cephalo-lateral margins ; some species are elongate ; 

 color varying from a transparent yellowish or whitish to black, but 

 mostly dark brown; many species variously dotted with darker 

 markings; margin toothed, wax tubes moderately developed, inci- 

 sions shallow; thoracic and caudal tracheal folds present and in 

 most cases plainly visible and ending on the margin in a distinctly 

 differentiated comb of teeth from which arise pencils of waxy secre- 

 tion, differing from the more or less amorphous secretion of wax 

 surrounding the case, secreted by the marginal wax tubes. Dorsum 

 with the disk not separated from the submarginal area and without 

 prominent pores or papillae, though usually with a number of minute 

 clear pores. (In rare exceptions there are many wax pores.) Vasi- 

 form orifice small, transverse, rounded, or elongate, the inner margin 

 rarely armed with teeth; operculum filUng from a third to all of the 

 orifice and obscuring the lingula. 



Adults with wings unmarked, clouded, or spotted; the radial sector 

 of forewing with a single flexure; no spur of the media, but the 

 cubitus faintly indicated. Antennae of seven segments, segment 

 III the longest; the other distal ones subequal, with IV, however, 

 usually the shortest. Claspers of male considerably curved at their 

 distal extremities and possessing a number of prominent spines. 

 Proximad of the distal spur of each clasper there is either a lobed 

 structure or other smaller spurs. 



Type. — Aleuroplatus quercus-aquaticae (Quaintance). 



KEY TO SUBGENERA OF THE GENUS ALEUROPLATUS. 



1. Vasiform orifice not armed with teeth on its inner caudo-lateral margin. 



Subgenus Aleuroplatus. 



2. Vaaiform orifice armed with teeth on its inner caudo-lateral margin. 



Subgenus Orchamus. 



