NO. 2156. .SUBFAMILY ALEYRODINAE-QUAIXTAXCE d- BAKER. 405 



ALEUROTHRIXUS (PHILODAMUS) INTERROGATIONIS (Bemis). 



Aleurodes interrogationis Bemis, Proc. U. S. Nat. Mus., vol. 27, 1904, p. 510. 



This species has been fully described and figured by Bemis. The 

 margm does not present an apparent double rov>' of wax pores as in 

 subgenus Aleurotlirixus, but has a single row of teeth, the sutures 

 between them extending a good way mesad. The operculum is 

 very small and somewhat triangular, filling only a small portion of 

 the orifice. 



Paratype.— Cat. No. 7092, U. S. N. M. 



Genus DIALEURODES Cockerell. 



T. D. A. Cockerell, in his Classification of the Aleyrodidae * pub- 

 lished m 1902, established the subgenus Dialeurodes and pointed out 

 several important characteristics of the group. Aleyrodes citri 

 Kiley and Howard was indicated as type and A. eugenix and A. 

 aurantii were also referred to this subgenus. 



In a subsequent paper, The White Fly {Aletjrodes citri) and its 

 AUies,2 Cockerell cites as additional examples of Dialeurodes, Aley- 

 rodes croceata, A. fodiens, and A. jnyeris. Some of the species 

 referred to Dialeurodes by Cockerell do not belong to the group, as 

 understood by us — i. e., cotesii, pi'peris, and croceata. The writers 

 believe that Dialeurodes is of generic rank and have so indicated. ^^ 



WliHe the species of Dialeurodes present a general uniformity m the 

 presence of certain prominent characters, there are to be recognized 

 several minor groups for which it has seemed necessary to erect 

 subgenera. Species of this genus are largely oriental, and some of 

 them are of especial mterest by reason of their injuries to plants, as 

 D. citri, citrifolii, etc. 



Pupa case variable in size, elliptic to subcrrcular in outline; color 

 usually yellowish, varying in some species to brownish; margm of 

 case toothed, the wax tubes u-regular in outline and but httle devel- 

 oped; submargmal area not separated from dorsal disk; dorsum 

 usually without papillae or pores; tracheal folds evident, in some 

 species very conspicuous, terminating on margm of case in a pore, 

 the folds often showmg dot-like, linear, or polygonal markings; wax 

 secretions absent or very scant. Vasiform orifice relatively small, 

 transversely oval or subcircular, with or without comb of teeth on 

 inner lateral and caudal margins; operculum large, mostly filling the 

 orifice and obscuring the Hngula. 



Adult with one flexure in radial sector of forewing and no trace of 

 media. Antennae of seven segments; segment VII not distinctly 



1 Proc. Acad. Nat. Sci. Phila., 1902, p. 280. 



2 Bull. 67, Fla. Agric. Exp. Sta., 1903, p. 662. 



3 Tech. Ser. 27, pt. 2, Bur. Ent., U. S. Dept. Agr., 1914, p. 97. 



