﻿NOTES ON A LIME TRBE APHIS NEW TO BRITAIN. 119 



oxcentric spot (p). Lateral borders of the abdomen with a few fine 

 hairs. Wings ample, smoky, with dark brown to black veins and 

 dark rhomboidal stigma, the media reaching the edge of the wing, 

 the cubitus often not reaching the edge of the wing ; in the hind 

 wings (fig. 4a) the radius, radial sector, and second anal arise close 

 together and reach the edge of the wing normally as simple veins, but 

 now and then the second anal is forked, the inner branch not 

 reaching the wing border (b). This abnormality may often be seen 

 in one wing and not in the opposite one. 



Larva from Alate Female. (Figs. 2a & 5). 



Length on entering soil, -5 to -7 mm. Yellow to pale citron 



yellow. Antennae (fig. 2a) of four 



J^ *^^ jj^ segments, about half the length 



~-Y <^- fl }^-X^A;:^^^^ ^^ ^^^® body ; the first segment small ; 



^0^ ll'^{^^\j3 the second longer than the first, 



* X^C^P^r shorter than the third ; the fourth 



/f!i;23^ tv^I^t^^ ^ little longer than the third and 

 4>~ <^^- IP'CX^ slightly swollen, with a short blunt 

 4fc>^'r — Ipv?^ " ^^^^ " ^^^ sub-apical sensoria ; 



ffi^lU |k<;^3 a few pale fine hairs on all the 



^A'^^^^^^UZ^fl segments. Eyes very small, com- 



aVtc^^^^^^jV? posed of two dark red to black 



AA^^^^ijt^^ facets, and at the side two clear 



^^</\l^^ round areas (fig. 3a). Head rather 



Jn narrow and long. Proboscis pallid, 



* very slightly dusky at the apex. 



Fig. 5.-Larva from alate female projecting far beyond the end 



(S. P. o-eaunmri, Kalt.). of the body. Abdomen slightly 



swelling out apically and with a 



few long apical and lateral pale hairs. Legs pale, moderately long 



and thick. Anal plate dusky. 



I do not enter here into its generic position, but have followed 

 Del Guercio who, I think, is correct in retaining Koch's genus 

 Pachypappa, and in placing this very interesting species in that 

 genus. Its marked posterior wing venation may be of system- 

 atic value and so connect it with the type (vesicalis) of Koch's 

 genus, but with this character must more surely go the marked 

 sensorial character of the antennae, and this marked character 

 places vesicalis, reaunmri, and corni all very close together and 

 yet far away from Schizoiieara ulmi, S. lanuginosa, S.fuliginosa, 

 and S. lanigera. 



But the venation of the hind wings of Pachypappa differs 

 from that of .4u(«cia corni, so they are placed in different genera. 

 In one case I have seen and preserved an Aphid with the 

 venation of Schizoneiira on one side and true Aphis on the other, 

 and in many cases in the same family all manner of venation 

 within such wide limits that it seemg to me one cannot rely on 

 venation as of any value in this group of insects. 



