OF WASHINGTON. 195 



this species was simply an ordinary cosmopolite and showed that 

 a number of other mites which he especially mentioned are also 

 practically cosmopolitan. Mr. Howard called attention to the 

 fact that this clover mite is peculiarly adapted to a commercial 

 distribution. It may and probably has been carried commercially 

 on nursery stock all over the world, while from the habits of the 

 adults in crawling great distances in search of hibernating quar 

 ters it may be carried on anything coming from the household, 

 or even upon the bodies of animals. Mr. Marlatt said that the 

 occurrence of this insect upon cultivated trees and in households 

 had only recently been recognized, and that its wide distribution 

 was probably of very early occurrence. Mr. Schwarz stated that 

 the occurrence of this Bryobia on very high mountains is very re 

 markable. Mr. Hubbard and himself have found it during the 

 month of June in the Wasatch Mountains of Utah, at an eleva 

 tion of from 10,000 to 1 1 ,000 feet. The eggs occurred in such 

 quantities under stones between the snow fields that they could 

 be scraped up by quarts. 



The next paper, which was presented by Mr. Schwarz, 

 was entitled : 



NOTE ON THE CEDRELA PSYLLIDS (GENUS FREYSUILA 



ALEMAN). 



By E. A. SCHWARZ. 



Many years ago, the late Dr. Eugene Duges, of Guanajuato, 

 Mex., sent to the lamented Dr. C. V. Riley some badly pre 

 served specimens of a remarkable Psyllid, with the statement that 

 this insect was greatly injurious to Cedrela trees.* They were 

 then considered as belonging to an undescribed genus and species. 

 What appears to be the same species was sent some years later by 

 Dr. A. Ernst, from Caracas, Venezuela, and by Mr. F. W. 

 Urich, from the island of Trinidad, W. I., the species being in 

 either case marked as being injurious to Cedrela trees. Finally, 

 in 1896, Dr. Alfred Duges, of Guanajuato, Mex., forwarded ad 

 ditional specimens to Dr. L. O. Howard, with the statement that 

 this Psyllid had been described by Dr. J. Aleman, under the name 

 of Frey-Suila dugesii. 



* Cedrela belongs to the family Sterculiaceae. The wood of C. odorata 

 (and perhaps also of other species of the same genus) has of late years ac 

 quired considerable economic importance, and it is stated that it is never 

 attacked by any insect, not even the termites, 



