.54 Annals Entomological Society of America [Vol. IV, 



In 1909 five new genera were formed in this group, one of 

 which must be a synonym and a second which would accord- 

 ing to the reasoning of this article also be a synonym. 



The genera are Eiilachnus Del Guercio (loc. cit.), the type 

 of which probably should be E. Agilis (Kalt.) 



Lachniella Del Guercio (loc. cit.), the type of which is not 

 set, and is, I consider, a synonym of Lachnus. J 



Essigella Del Guercio (loc. cit.) with E. calijornicus (Essig) 

 as the type. 



Davisia Del Guercio (loc. cit.) L. longistigma Monell as the 

 type and which is a synonym of the following genus. (Nov. 

 13, 1909). 



Longistigma Wilson 10 , type L. caryae Harris which I have 

 published as synonymous with L. longistigma Monell and L. 

 platinicola Riley. (Nov. 1, 1909.) 



According to the evidence shown here using Del Guercio's 

 arrangement to generic characters, the correct synonymy is as 



follows : 



1. Trama Heyden 



type T. troglodytes Heyd. 



2. Stomapkis Walker 



type S. Quercus (Linn). 



3. Plerochlorus Rondani 



Syn. Cinara Curtis? 

 Syn. Dryobius Koch. 

 Syn. Dryapkis Kirk- 

 typo P. roboris (Linn.) 



4. Essigella Del Guercio 



type E. calijornicus (Esi 

 ■j. Longistigma Wilson 



Syn. Davisia Del Guercio 

 type L. caryae (Harris). 



6. Tuberolachnus Mord. 



? Syn. Schizolachnus Mord. 

 type T. viminalis (Boyer). 



7. Lachnus Burmeister. 



Syn. Lachniella Del Guercio 

 Type L. fasciatus Burm. 



8. Eiilachnus Del Guercin 



type B. Agilis (Kalt). 



In the December, 1910, issue of the Annals the author 

 published a paper on the genera of the subfamily Aphidinae 

 and wishes here to note two corrections. 



The type of the genus Illinoia should read m. liriodendri 

 Monell. The type of the genus Hyalopierus Koch should read 

 A. pruni Fab. instead of aurantiae Koch. 



10. Can. Ent., vol. -11, p. 385, 1907. 



