124 BRITISH APHIDES. 



Reaumur gives a spirited woodcut of a coiled gall 

 on the poplar ; and one cannot doubt that it was the 

 work of Pemijliigus spirothecce. 



Koch's description of the distorted leaf-stalks as 

 " Stopselzieherartig gewindene Beulen " (corkscrew- 

 twisted bladders), clearly identifies his P. affinis with 

 Passerini's P. spirotlieccB. The diagnosis of the 

 insects also well suits both. Koch says the fourth 

 antennal joint is much shorter than the two following, 

 and that whilst the species is intimately allied with 

 P. [hursmmis, it is nevertheless smaller and woolly. 

 P. affinis of Kaltenbach is a large insect, and, as Pas- 

 serini remarks, is not identical with Koch's P. affinis. 

 Except that the last specific name is preoccupied, 

 priority should be given to that of Koch, who first 

 clearly described the insect. 



Koch's figure represents the insect covered with long 

 hair instead of flocks of cotton ; a defect likely to 

 mislead the searcher. 



This species has not been, hitherto, recorded as 

 British. Probably it is nowhere plentiful in this 

 country. 



Pemphigus laotucaeius, Pass. Plate OXII, figs. 7 — 13. 

 Amycla fiiscicornis, Koch. 



Apterous viviparous female. 



Incli. Millimetres. 



Size of body 0-080 X 0'045 2-02 X 1-13. 



Length of antennae 0*020 0*50. 



Oval, pale yellow, mealy, with an abundance of long, 

 waxy, silk-like fibres, which proceed more particularly 

 from the anal rings. Early in the year these insects 

 are quite blind, but in the autumn they show obvious 

 eyes, though very small. Antennae short and fuscous 

 towards the tips. Tail and nectaries none. Antenna, 

 legs, and a squarish spot on the occiput sooty grey. 



