96 CLASSIFICATION OF THE ALEYEODID^. 



Genera op the Aleyrodin^. 



I. Fore'wing of adult "vpith radiusi present as a distinct vein Aleurochiton. 



II. Forewing of adult without radiusj. 



A. Pupa case without a submarginal row of papilla-like pores, and with dorsal 

 disk not separated from submarginal area. 



1. Pupa case with thoracic tracheal folds present. 



a. Thoracic tracheal folds ending on or near the margin in a more or 



less circular pore. 

 (1) Vasiform orifice relatively small and roundly subcordate, 

 operculum almost filling orifice and obscuring lin- 

 gula Dialeurodes. 



b. Thoracic tracheal folds ending in a comb of teeth. 



(1) Vasiform orifice relatively small and transversely rounded, 



the operculum almost entirely filling it Aleuroplatus. 



(2) Vasiform orifice subcordate, acute caudad, the operculum 



filling about two-thirds of orifice and leaving caudal por- 

 tion of lingula exposed Dialeurodoides. 



2. Pupa case with thoracic tracheal folds not evident. 



a. Vasiform orifice situated in a pit or depression which is usually 



transversely ribbed or furrowed. 

 (1) Operculum transversely rectangular, small, the knobbed 

 extremity of the lingula visible caudad of it Pealius. 



b. Vasiform orifice not situated in a pit. 



(1) Vasiform orifice triangular, very elongate, operculum small 



and transversely elliptical, lingula long and visible for 

 fully half its length caudad of operculum Beviisia. 



(2) Vasiform orifice subcordate, with cephalic margin straight. 



(a) Adults with antennae of seven segments, of which III 



is the longest, IV-VII being suboqual . . .Aleyrodes. 



(b) Adults with antennae of seven segments, of which VII 



(in male) is much the longest, being as long as the 

 remaining ones together Almrocybotus. 



(3) Vasiform orifice small, roundly subcordate, or subcircular. 



(a) Lingula long and distally knobbed, extending caudad 

 from orifice for one-third to one-half of its length. 



AleurotuliLS. 

 (h) Lingula short and obscured by the operculum, which 

 almost entirely fills the orifice. 



* Dorsum with several series of prominent spines; 



margin with very distinct teeth . .Aleurocanthus. 



* Dorsum without such series of prominent spines. 



** Dorsum with a central ridge or trachea-like 

 elevation, the orifice situated on its caudal 

 extremity; margin with a double series of 

 teeth, the outer series lighter in color than 

 the inner. Wax not abundant. 



A leurotrachelxis. 

 ** Dorsum without such a central trachea-like 

 structure, but usually with several pairs of 

 prominent spine-like hairs. Wax secre- 

 tion very ahundant, flocculent, or woolly. 



Aleurothn'.rus. 

 (1) "\'asiform orifice transversely rectangular; operculum similar, 

 very short; lingula broad and short, truncate caudad. 



Neoinaskellia. 



