A CONTRIBUTION TO OUR KNOWLEDGE OF THE WHITE 

 FLIES OF THE SUBFAMILY ALEYRODINAE (ALEY- 

 RODIDAE). 



By a. L. Quaintance and A. C. Baker, 



0/ the Bureau of Entomology, United States Department of Agriculture. 



INTRODUCTION. 



The present paper is in continuation of the writers' work on the 

 classification of the Aleyrodidae pubhshed as Parts 1 and 2 of Bulletin 

 27, technical scries, Bureau of Entomology, and is based on material 

 in collections of the United States National Museum and the Bureau 

 of Entomology. These collections during recent years have been 

 materially augmented by the receipt of specimens from various parts 

 of the world, especially oriental regions and tropical North America. 



Recent years have witnessed considerable activity on the part of 

 entomologists in the study of the Aleyrodidae, and the number of 

 species at present known is considerably in excess of the number 

 at one time thought to exist. It is certain that there are very many 

 as yet unrecognized species, especially in tropical regions, and it is 

 hoped that entomologists and collectors who have opportunity will 

 interest themselves in this comparatively un worked group of insects. 



Genus ALEUROCANTHUS i Quaintance and Baker. 



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

 Dept. Agr., 1914, p. 102. 



Pupa case medium in size, subelUptic in outline, usually dark brown 

 orblackincolor;marginof case toothed, the wax tubes very prom- 

 inent; submarginal area not separated from dorsal disk; dorsum 

 without papillae or pores, though bearing many heavily chitinized 

 spines variously arranged; tracheal folds usually not discernible, 

 though evident in a few species; wax secretion usually present as a 

 narrow fringe from marginal wax tubes. Vasiform orifice small, 



1 A leurodes voeltzkowi Newstead, A leurodcs citricola Newstead, A leurodes nubilans Buckton, and A leurodea 

 bariksiae Maskell are not included in the following key. Of the first three species the descriptions are so 

 poor that it is impossible to arrive at an understanding of the species. The last we place here doubtfully 

 on the structure of the larva, the slide of pupa case being in such condition that it is impossible to make out 

 any details. 



PROCEEDINGS U. S. NATIONAL MUSEUM. VOL. 5I-N0. 2156. 



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