1900] ENTOMOLOGICAL NEWS. 427 



material having been sent to this office for determination by 

 Mr. John Dearness and Professor William Lochhead. The 

 lilac bush on the Department grounds is as thickly infested as 

 it is possible for a plant to be with a scale insect : and the 

 injury to it has been considerable, many of the shoots having 

 been much weakened or killed. 



It is possible that the specimens from British Guiana are 

 also on lilac, although the fragement of wood received does 

 make accurate determination possible. If lilac should prove 

 to be a common food plant, this fact would easily explain its 

 distribution in this country. 



The following bibliography of the species will indicate also 

 the synonymy : 



Aspidiotus affinis , Xewst. Ent. Mo. Mag., vol. xxix, p. 186, 

 pi. iii, fig. 2, 1893. 



Aspidiotus dijfinis, Newst. Ent. N. Mag., vol. xxix, p, 

 281, 1893. 



Aspidiotus ajfinis (diffinis), Ckll. Can. Ent., 1894, p. 130. 



* Aspidiotus dijfinis, Newst. var. latcralis Ckll. new var. 

 Can. Ent., 1894, p. 130. 



Aspidiotus (Jlinspidiotus) dijfinis Ckll. Bull. 6, Tech. Ser. 

 Div. Ent. U. S. D. A., 1897, p. 23. 



* Aspiditous {Diaspidiotus} dijfinis, var. latcralis Ckll. Bull. 

 6, Tech. Ser., Div. Ent., U. S. D. A., 1897, p. 23. 



Honiberlesia dijfinis, L,eonardi. Ri vesta Pat. Veg., vi, 132 

 134, 1897, fig. 8. 



Aspidiotus jatrophfB, Townsend & Cockerell. Journ. N. Y. 

 Ent. Soc., vol. vi, p. 178, 1898. 



THE ENTOMOLOGISTS DIRECTORY has been completed, and contains 

 the names (1200) and addresses of all those persons who showed suffi- 

 cient interest to send in their names in answer to our circulars. This pub- 

 lication can not fail to prove exceedingly useful to every individual who 

 takes an active interest in entomology. Those persons who exchange 

 specimens will find it just what they have long desired. Copies may be 

 obtained from Mr. E. T. Cresson, P. O. Box 248, Philadelphia. Price 

 50 cents. 



* As shown elsewhere by the writer, this so-called variety of diffinis, was based on 

 immature scales of Aspidiotus latanice Sign, and these citations belong also with the 

 latter species. 



