THE CANADIAN ENTOMOLOGIST. 147 



hatching therefrom and the deaths due to what is beh'eved at present, in 

 Florida, to be bacterial in origin.^ 



While the citrus white-fly feeds on a number of plants and trees, the 

 cloudy-winged has been found only on citrus and the rubber tree, Ficus 

 nitida. Its discovery on the latter food plant in New Orleans by the 

 writer November, 1910, was such as to indicate its probable origin in India 

 or China. While this species is doubtless still present in Cuba, it cannot be 

 said to be of economic importance at this writing. 



The Woolly White-fly, Aleyrodes howardi Quaintance. 



This species was found quite generally distributed on orange trees 

 wherever these grow in Cuba and Isle of Pines. It is this species which 

 causes the blackening of foliage to which reference is frequently made. 

 It is, however, not a serious pest and cannot be classed in destructiveness 

 with citri and niibifera. Its spread is most rapid among old orange 

 trees and during the drier seasons. Being a species possessing a thick 

 pupa it is heavily parasitized. It is not only parasitized by the red fungus 

 Ascherso7iia aleyrodis, as noted by Cook and Home (I. c.) and by the 

 writer at Seiba Mocha, Guinis, Santiago de las Vegas, and on the Isle of 

 Pines, but is preyed upon by the larvae of a Tortricid moth. Frequently 

 colonies were found, each pupa of which showed the emergence hole of a 

 hymenopterous parasite or devoured by Tortricid larvae. The life history 

 of the species and its occurrence in Florida has been treated by the 

 writer.* 



Besides occurring in Cuba and Isle of Pines, it has been found at 

 Tampa, Ft. Myers and Miama, Florida. It occurs quite generally in the 

 West Indies. 



The Paw-paw White- fly, Aleyrodes variabilis Quaintance. 



This white-fly has previously been reported only from Florida by 

 Quaintance^ and Back* and from Barbadoes by Gowdy.' Recently it has 

 been found in abundance at Santiago de las Vegas on paw-paw (Carica 

 papaya) by Prof. P. Cardin. It cau~ses a severe blackening of the foliage 

 at times. 



X. Natural Control of White- flies AfFectiog Citrus in Florida, Morrill & Back, 

 Bulletin 102, B. E., U. S. Dept. Agric. 



2. The Woolly White fly: a New Enemy of the Florida Orange, Back, Bulletin 

 64, pt. 8, B. E., U. S. Dept. Agric. 



3 Tech. Bull. No. 8, Div. Ent., U. S. Dept. Agric. 



4. Florida Fruit & Produce News, 1910. 



5. West Indian Bulletin, Vol. IX, No. 4. 



