aphididyE. 275 



either the fourth or fifth, the aborted seventh joint longer than in 

 Lachmifi. 



" Cornicles very inconspicuous. 



i' Legs shorter than in Larhnu.'^, and less stout. Tarsus hi- 

 articulate, tail none, rostrum very long in the apterous females, but 

 shorter in the winged forms." 



I have not found Stomaplm, and therefore only give the generic 

 characters. 



Genus Dryobius. 



The following generic characters are taken from Buckton : — 



" Eostrum rather long and thick, projecting beyond the post- 

 sternum — much longer in the young. 



"Antennae slender, six-jointed, with an unciform process in the 

 sixth joint. Third joint more than twice the length of any other, 

 the fourth and fifth joints about equal — the sixth, less than half the 

 length of the fifth. 



" Cornicles conical, and very short. 



" Cauda inconspicuous and rounded. 



" Legs, the first two pair moderately long, the hinder pair dispro- 

 portionately long; tarsus composed of two distinct joints. 



" Wings moderately long in the males, but very short in the 

 viviparous females. Stigmata rather long; cubital and first furcal 

 veins issue from the same point, which is at some distance from the 

 cubitus. The membrane of the upper wings variegated with brown, 

 smoky fascite." 



Buckton in his Monograph describes three species, but they appear 

 to have been found either on the Continent or in the south of 

 England ; and as I have not found either of the species myself, I 

 must simply refer the student to the generic characters. 



Tribe SCHIZONEURIN^. 



This tribe contains the dreaded " American blight " found on fruit- 

 trees, and the damage done to stem and roots is unfortunately only 

 too well known to require description. 



The species belonging to this tribe diff"er in two ways from insects 

 belonging to the previous tribe, both as regards the structure of the 

 insects and the nature of the injuries. 



