326 Mr. Buckton's notes on the occurrence in 



apterous and winged female forms, and I received 

 from him a consignment of about thirty individuals, 

 some five or six of which had wings. 



By the first week in July the winged viviparous females 

 had almost disappeared, and considerable difliculty was 

 found in obtaining an additional specimen on the 21st 

 of that month, though the apterous insects were still 

 fairly plentiful. They certainly also live to the middle 

 of August. 



I append a diagnosis of this new species : — 



Thelaxes betulina, Buckton. 

 Apterous viviparous female. — Size of body, 0*050 X 0*035 inch. 

 Variable both in colour and in size. The earlier broods have a 

 general pale or olive-green colour, and are furnished with a delicate 

 brown hairy coat. Head small ; eyes pale ; antennae green, tipped 

 with black, five-jointed, ending with a "nail," as in Thelaxes 

 dryo2)hilla. Legs short. Upper side sometimes of a lively green, 

 whilst other examples show an olive tint, with four or more dis- 

 jointed transverse bands, which, being interrupted down the 

 dorsum, mark out a green strij)e with adjacent white or green side- 

 patches. Six or seven obscure pores occur down each side, just as 

 we see in T. dryopliilla. The nectaries are mamilliform. The 

 young are wholly of a bright and delicate green. The later moults 

 occur larger, more globose, and the green parts become dark to 

 almost black. Pupa bright yellow, with brown head, wing-cases, 

 and tarsi. The thorax and abdomen are sparsely dotted with 

 brown. 



Winged viviparous female. — Expanse, 0*240 inch ; size of body, 

 0*060 X 0*040 inch. General colour dusky green, with dark brown 

 patches on the thorax. Head, eyes, and antennae dark brown or 

 black. Cauda, nectaries, and several broad square spots down the 

 dorsum accompanied by smaller lateral spots, of the same colour. 

 Antennae five-jointed, ending in a nail-like process ; the thii-d joint 

 the longest and green. Abdomen slightly tuberculose. Eostrum 

 reaches to the third coxae. "Wings delicate in texture, folded hori- 

 zontally when at rest. Costa greenish, with a brown stigma. 

 Venation distinct and dark brown. Cubital vein, which does not 

 quite touch the cubitus, once forked. Hind wings with a single 

 oblique vein rising from the ciibital. 



Wing-venation amongst the Aphides is a highly im- 

 portant character. Mr. F. Walker, in his Cat. Homop., 

 has, on p. 1052, vol. iv., a mere notice witliout descrip- 



