THE CANADIAN ENTOMOLOGIST. 169 



APHIDID/E FOUND ON THE APPLE IN BRITAIN AND 

 THE DESCRIPTION OF A NEW SPECIES 

 . FROM AFRICA. 



by fred v. theobald, m.a. 

 Aphidid.e Found on the Apple in Britain. 



No less than eight species of Plant Lice or Aphididee have 

 been found at different times on the apple in Great Britain. The 

 following are the species I have examined: — 



1. Aphis pomi De Geer. 



2. Aphis kochii Schonteden. 



3. Aphis cratcEgi Kaltenbach. 



4. Aphis nigra nov. nom (oxyacanthcB Koch). 



5. Aphis riimicis Fabricius. 



(3, Siphocoryne avena Fabricius. 



7. Phorodon humiili Schrank. 



8. Eriosoma lanigera Haussman. 



Of these, four species are common, namely, Aphis pomi, Aphis 

 kochii, Siphocoryne avencE and Eriosoma lanigera. 



Of the others, I have several times received or found Kalten- 

 bach's Aphis cratcegi, ywhich. must not be confounded with the Aphis 

 of that name redescribed by Buckton in his Monograph of British 

 Aphides,* which is a totally distinct insect — green, not black! 

 Aphis rumicis was sent me once from apples in 1900, and in 1904 

 I found many on some "Maiden" apples, undoubtedly "casuals" 

 in both cases. Nevertheless this Aphid was reproducing on the 

 fruit trees. 



Aphis oxyacanlhce Koch (non Schrank) has been sent me once 

 from Berkshire, t 



Phorodon humidi, the Hop-Damson Aphis, was found in 1911 

 breeding on a few apple trees at Wye in considerable numbers. 

 The chief object of this paper is to show that the most harmful 

 of all apple-leaf and shoot-feeding "Plant Lice" in Great Britain 

 is Koch's Aphis pyri, renamed by Schonteden Aphis kochii (for 

 reasons afterwards given), and not as has been stated here and in 

 America, Kaltenbach's Aphis sorbi, which was described from 

 specimens found on Sorhus aucup aria, a t otally distinct species,^ 



*Vol. !1, p. :j.-), pi. XLVII, figs. l-:5, 1877. ~~~ ' 



fThis I have renamed Aphis nigra. 

 Mav, 19 IG 



