140 THE CANADIAN ENTOMOLOGIST. 



Cook and Horne"^ refer to this species as being introduced into Cuba at 

 Santiago de las Vegas on Florida nursery stock. 



An examination of material in the Bureau of Entomology, Washing- 

 ton, by Prof. Quaintance. and of material collected by Cook and Home 

 at the Cuban Experiment Station by the writer, leaves no doubt that 

 A. nuhifera is the species regarding which they wrote. Frequent reports 

 both in Florida and Cuba of injury caused by this* insect to Cuban citrus 

 groves are entirely groundless. In no citrus grove visited from Havana 

 west beyond Bahia Honda, for over too miles east of Havana, or in the 

 Isle of Pines in the general vicinity of Santa Fe, was any trace of this pest 

 found. Over three thousand acres of citrus were examined. Mr. W. H. 

 Hoard, of Victoria de las Tunis, who has been thoroughly familiar with 

 this insect in Florida for many years, states that it does not occur, to his 

 knowledge, in Central and Eastern Cuba. Cuban growers of citrus may 

 well feel thankful that this pest has not yet secured a foothold on their 

 island. As this species feeds on coffee almost as greedily as on Citrus^ as 

 evidenced by examinations made by Dr. E. \V. Berger in Florida and by 

 the writer in the Audubon Park greenhouses in New Orleans, the coffee 

 industry of the island would be affected should this pest become abundant. 

 Coffee plants examined by the writer at Seiba Mocha were free from 

 white-fly. 



The Cloudy-winged White-fly, Aleyrodes niibifera Berger. 



This is the species referred to by Cook and Home (1. c.) erroneously 

 as citri. They stated in 1908 that since first seen this species had been 

 decreasing so that at that time it was very difficult to find more than a 

 few healthy specimens in one place. In their opinion the red fungus 

 ( Aschersonia aleyrodis) was responsible for this gradual decrease. While 

 the writer examined many orange and grape-fruit trees of all ages in Cuba, 

 even trees in the grove in which it was present in 1908. he was unable to 

 find specimens, but Prof. P. Cardin found orange trees in the Vedado 

 district of Havana badly infested during June, 191 1, and sent specimens 

 to the writer. As the red fungus is known in Florida to attack only 

 sparingly this aleyrodid, it is more than probable that other causes have 

 brought about this condition of scarcity, especially the wholesale mortality 

 due to overcrowding as a result of the peculiar habit of the adults of this 

 species to crowd small areas of the tenderest growth with eggs far beyond 

 its capacity to furnish room for the development of the larvae subsequently 



*Bulletin 9, Estacion Central Agronomi^a de Cuba, 1608, page 30. 



