PHTLLAPHIS FAGT. 37 



the ordinary flat lime Aphis. He remarks, however, 

 that in 1842, " I had the luck to discover them on two 

 sheltered Hme-trees," and then he refers the reader to 

 Schizoneura Reaumuri of his work. 



Kirby and Spence mention a gall on the lime-tree, 

 and also on the willow, both of which they say are the 

 produce of Aphides, but it is doubtful to what species 

 these have reference. 



Genus XVIII.— PHYLLAPHIS,* Koch. 



Rostrum very short. 



Head convex, smooth. 



Antennae moderately long, the third joint about 

 double the length of the fourth ; the fifth and sixth 

 joints equal, the sixth furnished with a representative 

 nail. 



Cornicles hardly visible, and lying flat to the body. 



Cauda almost obsolete. 



Body furnished with long flocks of wool-like fibre of 

 a waxy nature. 



Wings long and broad. Stigma long and trape- 

 zoidal. Nervures not clouded. 



Legs moderate in size. 



Phyllaphts fagi, Linn. Plate XCIV. 



Aphis fagi, Linn., Fab., Walk. 

 Lachnus fagi, Burm., Kalt. 

 Phyllaphis fagi, Koch, Pass. 



Apterous viviparous female. 



Incli. Millimetres. 



Size of body 0-090x0'035 2-27x0-88 



Length of antennae 0*060 1*52. 



Cornicles wartlike „ 



* From ^i'XXoi', a leaf. 



