40 BRITISH APHIDES. 



dilated at their inner aspects into three drum-like 

 tubercles (auditory?). Legs short and black. 



This somewhat singular-looking insect was taken 

 on an oak at Haslemere early in June. I could find 

 no apterous females in the vicinity; and therefore very 

 probably the fly was not bred on that tree, but had 

 strayed from its birthplace. 



As it answers to no published description of a 

 Chermes, and yet has some marked characters, I 

 add it to the list of British insects, with the anticipa- 

 tion that the immature forms and the life-history will 

 at no long time hence come under notice. 



The following short list comprises, I believe, all the 

 species of Chermes as yet described from European 

 localities : 



Chermes abietis, Linn.; Ch. laricis, Hartig; Ch. 

 corticalis, Kalt. ; Ch. strobilobius, Kalt. ; Ch. pini, 

 Koch ; Ch. coccineus, Ratz. ; Ch. atratus, Buckton ; 

 Anisophleba hamadrias, Koch. 



It is to be noted that the larval forms of Chermes 

 seem to approach nearer to those of Coccus ; and that 

 in their alate forms the costaa of the wings and the 

 dilation of their stigmata (coupled with the tendency 

 shown by some to deposit chitine in the ordinary 

 substance of the membrane) suggest some possible 

 passage out of the Homoptera into the lower members 

 of the Heteroptera. 



Chermes pini, Koch (?). Plate CXVII bis, figs. 4— G. 

 Anisophleba pini, Koch. 



Apterous oviparous female. 



Inch. Millimetres. 



Size of body O035 X 0*022 0*88 X 0'55 



Length of antenna 0'005 0*12 



