128 BEITISH APHIDES. 



yet anotlier name, PeripliUJus testudo. He, like 

 Thornton, reo^arded it as a larva of some unknown 

 Aphis. 



Five years later Messrs. Balbiani and Signoret* 

 made known the unexpected fact that the Aphis com- 

 mon on the shoots of the maple, Acer campestre, has 

 the faculty of producing two sorts of young, one of a 

 normal type, the other diverse in form and incapable 

 of reproducing its kind. 



Subsequently they furnished a joint paper to the 

 Entomological Society of France, which is illustrated 

 by an excellent engraving of this curious and some- 

 what uncouth insect. 



According to these authors the green viviparous 

 female of Chaitopliorus aceris contains at the same 

 time two descriptions of embryo. The brown variety 

 has characters much as other Aphides show. At birth 

 they are garnished with tufts of simple hair, and even 

 at this early stage of their existence they exhibit dis- 

 tinct embryonic rudiments of other Aphides within 

 them. On the other hand, the bright green variety 

 has a figure and appearance so different, that, except it 

 had been seen that the same female produced both 

 forms, we certainly would have referred them to 

 species altogether separate. 



This Aphis I now describe. It has been known 

 under the following synonyms : 



PhyllojjJiorus testudlnatus , Thornton, Fernie. 

 Chebjmorpha testudo, Lane Clark. 

 Periplujllus testudo, Varj^der Hoeven. 

 Puceron de VErahle, Balb. at Signoret. 



Haditat. — England, Sweden, Holland, France, Swit- 

 zerland. 



Form oval, bright green. Eyes dark red or black. 

 Head very broad and large, with two shallow lobes 



* " Snr le development du Puceron bran de I'Erable," ' Comptes 

 Rendus,' 1867, p. 1259 ; also " Notice snr un Homoptere pen connu (Peri- 

 pbyllus)," t. vii, p. 371, et scq„ ' Ann. de la Soc. Entom. de France.' 



