62 BRITISH APHIDES. 



none. Rostrum very long in the apterous females, 

 but shorter in the wiugecl forms. According to 

 Walker altogether wanting in the males.* The four 

 joints sometimes equal three times the whole length 

 of the body. Setae very long and convoluted. 



Wings very short, a little longer than the body 

 (Walker), and carried horizontally (Reaumurf). Stig- 

 mata rhomboidal. Stigmatic vein curved (Kalt.). 



Stomaphis queeous, Reaum. Plate 01, figs. 2- 



Puceron de Ghene, Reaum., Bonnet. 

 Aphis quercus, Linn., Walk. 

 „ longirostris, Fabr. (?). 

 Lachnus quercus, Kalt., Walk., Pass. 



Apterous viviparous female. 



Size of body 

 Length of antennae 

 „ rostrum 



Very large, shining brown, rather hairy, oblong. 

 Head small. Byes brown. Legs moderately long and 

 fine. Antennee slender ; about half the length of the 

 body ; brown, except the third joint, which, like the 

 femoral and upper tibial portions, is ochreous yellow. 

 Rostrum very long and trailed between the legs whilst 

 walking, so that this protruding organ appears like a 

 long tail. Cauda wanting. 



Found, from July to October, on the stems of the 

 oak, into the bark of which the insects thrust their 

 rostra so deeply that they can be removed with diffi- 

 culty. The antennae are usually rapidly vibrated, 

 somewhat in the manner seen in the Ichneumonidce, 



* Mr. Walker tliouglit that there were sufficient structural diflfer- 

 ences in this Apliis to separate it from Lachnus. Although he did not 

 publish any generic characters, he suggested the above name, which I 

 have gladly adopted. Vide ' Cat. Horn. Insects,' part iv, p. 961. 



f Reaumur, 'Mem. des Insect.,' iii, 334, pi, xxviii. 



