408 PROCEEDINGS OF THE NATIONAL MUSEUAI. vol.51. 



the abnormality of the individual becomes greater. It seems wisest, 

 therefore, to leave it in Dialeurodes until more material oomes to 

 hand for study. 



The species tricolor, placed in this subgenus, also deserves mention. 

 It is scarcely a typical Dialeurodes and possibly may represent a dis- 

 tinct subgenus; nevertheless, on account of the structure of the 

 orifice and natm-e of the pores of the thoracic folds it is left here for 

 the present. 



DIALEURODES (DIALEURODES) CITRI (Ashmead). 



Plate 63, figs. 1-14; plate 64, fig. 1. 



Aleyrodes citri Ashmead, Florida Dispatch, new ser., vol. 11, 1885, p. — . 



Aleyrodes citri Riley and Howard, Insect Life, vol. 5, 1893, p. 219. 



Aleurodes eugeniae var. aurantii Maskell, Trans. N. Zealand Inst., vol. 27, 1896, 



p. 431. 

 Aleyrodes aurantii Cockerell, Bull. 67, Fla. Agi-. Exp. Sta., 1903, p. 666. 

 Dialeurodes citri (Ashmead) Quaintance and Baker, Joum. Agric. Research, 



vol. 6, 1916, p. 469. 



The orange white fly was fii'st described and named by Ashmead. 

 Later a more complete and detailed description was given by Riley 

 and Howard, and these authors have since been credited with the 

 name. According to the rules of zoological nomenclature, however, 

 Ashmead is to be considered as author of the species. In the same 

 year that Riley and Howard's description appeared, H. A. Morgan 

 pubUshed the description of another species on orange under the 

 name citrifolii. This species was later confused with Ashmead's 

 species. In 1896 Maskell pubhshed his description of aurantii, placing 

 it as a variety of his eugeniae. As pointed out by the senior author, 

 however, no difference can be noted between the specimens of aurantii 

 in the Maskell collection and specimens of citri; and, subsequently, 

 citri has been collected from numerous locaUties in India, the home of 

 Maskell's aurantii. In the Florida Agricultural Experiment Station 

 Bulletin 67 Cockerell raised aurantii to specific rank, and further 

 expressed the opinion that the home of citri would probably be shown 

 to be in the Orient. This has been fully substantiated by the collec- 

 tions of Messrs. Ehrhorn, Karnes, and Woglum, The specimens from 

 which the original description of citri was made were probably secured 

 from orange in Washington, District of Columbia, though specimens 

 had previously been collected in several localities in the Gulf States. 

 The species is now represented m the collection of the bureau from the 

 following States in the United States: Alabama, Cahfornia, Colorado, 

 Florida, Illinois, Louisiana, Mississippi, North Carolina, Texas, and 

 District of Columbia. The occurrence of the insect in Colorado, 

 Illinois, and the District of Columbia is probably confined to conserva- 

 tories. Specimens have been received from foreign countries as 

 follows: India (Lahore; Gujranwala; Dehra Dun; Wazirabad; Am- 



