APPENDIX. 



Our modern facilities for transport are now so great, 

 that it becomes necessary to modify our notions as to 

 when an animal is entitled to the term indigenous ; 

 indeed, the naturalisation of a species now becomes 

 merely a question of the period of time, and the degree 

 of persistence. 



Perhaps only two Aphides out of the series I have 

 described have been introductions into Britain within 

 historic times. They are the American apple Schizo- 

 neura and the grape Phylloxera. In the March of this 

 present year I received from Mr. J. Anderson, of 

 Chichester, an interesting addition to our list of 

 Aphides. As they apparently infest only the palms, 

 orchids, and a few other stove-plants, they must be 

 looked upon as a species introduced from without. 



An examination of these insects proves them to be 

 identical with a species described some years ago by 

 M. Boisduval, in his * Entomologie Agricole,' to which 

 he gave the name of Coccus latanice ; but M. Lichten- 

 stein has recently shown that it agrees with that 

 family neither in the construction of their antennas, 

 nor in the characters of their tarsi. Besides this, 

 M. Lichtenstein has satisfied himself that the rare 

 winged form of this insect is a true Aphis; allied, 

 perhaps, to Schizoneura, or to some near genus. 



M. Signoret had previously shown that it differed 

 from Coccus, and accordingly he changed the name to 

 Boisdiivalia latanice. M. Lichtenstein published at 

 Montpelier a more complete diagnosis, and at the same 

 time described the rare winged female. From the 

 presence of two minute horns on the vertex of the 



