NO. 2150. RUBFAMILY ALEYRODINAE—QVAIXTANCE d- BAKEJ^. 401 



zorg, Java. So far as is known it is the only representative of the 

 subgenus. The prominent combs on the margin of case are approached 

 only by those of pectiniferus. 



Pupa case (fig. 1). — Size 0.768 by 0.56 mm. Snape nearly elhp- 

 tical. . Abdominal segments not distinct. Margin (fig. 6) armed 

 with very shallow rounded teeth; just within the margin all 

 around a row of prominent papillae is situated. These are usually 

 knobbed (fig. 7), but some are cleft (fig. 2). Thoracic marginal 

 comb very prominent and armed with long narrow teeth, those in the 

 middle being longer than those at the sides of the comb (fig. 4). 

 Caudal fold armed with a similar comb (fig. 3), the teeth of wiiich 

 stand out if anything more distinct on account of the fact that tliis 

 comb is never depressed as is often the thoracic comb. Vasiform 

 orifice (fig. 5) broadly rounded, with the interior margin straight and 

 the inner, latero-caudal margins armed with a series of distinct 

 teeth; operculum filhng about one-third of the orifice. Color trans- 

 parent, tinged with yellowish. On the leaf the case is dirty white or 

 yellowish in color, and is surrounded with an irregular flat plate of 

 translucent yellow wax. * 



Described from pupa cases in balsam mounts. 



Type.— Cat. No. 19197, U.S.N.M. 



Genus ALEUROTHRIXUS Quaintance and Baker. 



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

 Agr., 1914, p. 103. 



Pupa case medium to small in size, elliptic; margin sometimes 

 angled; color variable, ranging from yellow to almost black; margin 

 of case usually with an apparent double row of teeth, the wax tubes 

 well developed; submarginal area not separated from the dorsal 

 disk; dorsum without papillae or pores, but bearing along median 

 line a few pairs of prominent spinelike hairs; tracheal folds not 

 discernible; wax secretion usually copious, flocculent, or woolly, 

 secreted by marginal wax tubes. Vasiform orifice small, trans- 

 versely elUptic; lingula obscured by the operculum, which nearly 

 fills the orifice. 



Adult with one flexure in radial sector of fore wing and no spur of 

 m-edia. Antennae of seven segments, of which III is longest. Sexes 

 nearly equal in size. 



Type. — Aleuroihrixus (Aleurothrixus) liowardi (Quaintance.) 



KEY TO SUBGENERA OF ALEUROTHRIXUS. 



1. Margin of case with apparent double row of wax pores, or teeth Aleuroihrixus. 



2. Margin of case without apparent double row, but with single row of wax pores, 



or teeth Philodamus- 



-Proc.N.M.vol.51— 16 26 



