NO. 2156. SUBFAMILY ALEYRODINAE-QVAINTANCE d BAKER. 407 



ment VII not shorter than segments IV, V, and VI, but usually 

 longer than any of these; segments III to VII armed with a series of 

 transverse or annular sensoria. Sexes nearly equal in size. Species 

 tropical or subtropical, originally oriental, though now rather widely 

 distributed. 



Type. — Dialeurodes (Dialeurodes) citri (Ashmead). 



KET TO SPECIES OF SUBGENUS DIALEURODES. 



1. Pupa case yellowish or whitish (without blackish coloration) 2. 



Pupa case with more or less dark brown or blackish coloration 3. 



2. The three tracheal folds covered with minute circular dots; size about 1.52 by 0.99 



mm.; tracheal pores situated just within margin of case, margined mesad with a 

 few blunt teeth and distad, with two claw-like lobes, the ends of which are 

 almost in contact; adult with wings unmarked; egga yellowish, without reticu- 

 lations ciiri. 



Thoracic tracheal folds with minute circular dots, caudal fold furrowed and marked 

 with squarish or polygonal areas; shape elliptical; size about 1.76 by 0.32 mm.; 

 tracheal pores opening just within margin of case; forewing of adult with a 

 distal clouded area; eggs dark, covered with reticulate waxy markings, .dtrifolii. 



3. Tracheal folds faintly evident; shape broadly elliptical, pale yellowish except 



dorsal area, which is dark brown, with conspicuous light cross stripes along body 

 segments; size about 0.8 by 0.74 mm.; vasiform oiifice longer than broad; oper- 

 culum about half filling the orifice fodiens. 



Tracheal folds and pores distinct 4. 



4. Color pale yellowish, almost transparent, with dorsal area dark brown 5. 



5. Vasiform orifice armed within with about 24-28 teeth; outline of case elliptic; size 



about 1.84 by 0.84 mm.; yellowish except a variable narrow longitudinal dark 

 brown stripe on center of dorsum, more pronounced on thorax; tracheal folds well 

 developed, covered with dot-like markings; pores opening just within margin of 

 case, surrounded with chitinized ring; wings of adult unmarked; eggs yellowish, 

 without sculpturing hirkaldyi. 



Color pale yellowish, almost transparent, but with a median dark gray or light- 

 brown shading 6. 



Color of submarginal area lemon-yellow, within this a dark irregular band; dorsal 

 disk orange; margin white; shape subcircular, about 1.28 by 1.08 mm; tracheal 

 folds distinct, dusky in marginal rim; pores opening within margin and sur- 

 rounded with a chitinized ring; dorsum covered with granular spots, marginal 

 rim with minute white dots; vasiform orifice armed within with about 12 promi- 

 nent teeth trkolor. 



6. Vasiform orifice armed within with about 12 distinct teeth; size 1.44 by 1.32 mm.; 

 thoracic tracheal folds distinct, broadening rapidly from margin, the three folds 

 thickly covered with rather large dots radiipunctata. 



In regard to the position of the species fodiens Maskell, which is 

 placed in the subgenus Dialeurodes, some statement is necessary. We 

 know the species only from the one specimen in the Maskell collec- 

 tion, which is in rather poor condition. Two possibihties occur: 

 First, it may not be a normal specimen of the species, and, second, 

 it may not be the final pupal stage. In the specimen the tracheal 

 thoracic folds and pores are hardly suggested. Since all other species 

 similar to it show these characters very distinctly, the possibility of 



