90 MISCELLANEOUS PAPERS. 



idves a very full account of the species in his '" Animali ed Ensetti del 

 Tobacco.'' The insect was first noticed in 1889 on leaves from Arau- 

 cania, where it was said to be spreading more and more. In the work 

 just cited it is remarked that, save possibl}^ for a decrease in dimen- 

 sions, the leaves do not show signs of alterations, but from the 

 quantity of insects which remain on the dry leaves the tobacco is 

 rendered unfit for use. No method of treatment is suggested. 



Sugar cane. — No aleyrodids have as yet been recorded from sugar 

 cane in this country, but abroad certain species are pests of impor- 

 tance. Aley7'odes hergii Signoret was described in 1867 from the Isle 

 of Mauritius, where it was found on sugar cane. In Java this same 

 species is at present a serious pest of cane, and there it has been care- 

 fullj' studied by Dr. L. Zehntner and reported on in the Archief Java 

 Suikerindustrie for 1890. Two other species infest sugar cane in 

 Java — namely, Aleyrodes lojigicorius Zehntner and ^1. lactea Zehntner, 

 the former being quite destructive. These species have also been fully 

 treated by Zehntner in the "Archief " for 1899. The remedial meas- 

 ure i practiced consist in cutting off and burning the infested leaves, 

 and spraying with milk of lime, wliich is said to destroy the immature 

 insects, but not the developed parasite within the pupa case — Ahlenis 

 pidcliriceps. Zehntner, which attacks longiconiis. Aleyrodes laotea is 

 also attacked by the fungus A.schersonia aleyrodh Webber, or a very 

 similar species, which attacks Aleyrodes eitri in this country. Aley- 

 rodes sacchari Maskell occurs on sugar cane in Fiji, and .1. harodensis 

 Maskell was received by Maskell from Baroda, India, with the advice 

 that the insects were rather damaging to sugar cane in those parts. 



Orange. — Of the several alej-rodids attacking the orange, Aley- 

 rodes eitri Rile}' and Howard is much the most important. In 

 Florida especially this species at the present timc^ is doubtless the 

 most important of all of the insect pests of this crop, and it is also 

 the subject of frequent complaint from southern Louisiana and to a 

 less extent from southeastern Texas. The literature of this species is 

 considerable, and its life history has been carefully worked out. 

 Some important papers are: " The Orange Aleja^odes,'" by Riley and 

 Howard (Ins. Life, Vol. V, p. 219); "Sooty Mold of the Orange 

 and its Treatment," by H. J. "Webber (Bull. 13, Div. Veg. Phys. and 

 Pathol., U. S. Dept. Agric.) ; "The White Fly," by H. A. Gossard 

 (Bull. 67, Fla. Agric. Exp. Sta.), and "White' Fly Conditions 

 in 1906. etc.," by E. W. Berger (Bull. 88, Fla. Agric. Exp. Sta.). 

 At the present time the insect is the subject of a special investigation 

 by the Bureau of Entomology. Aleyrodes foridensls Quaintance. 

 more common on guava in Florida, also occurs on the orange, but on 

 this latter plant it has not yet proved to be of special economic 

 importance. In Arizona Prof. T. D. A. Cockerell has found on 

 orange a form of Aleyrodes mori Quaintance wiiich he has given the 



