CALLIPTEEUS CORYLI. 17 



at Critchmere and other localities near Haslemere, from 

 April to July. 



This insect shows considerable variation as to tint 

 and markings. Walker describes several such in the 

 * Ann. of Natural History.' He there notices the 

 oviparous female and the winged male as coupling 

 during September and October. 



Several birch-inhabiting Callipteri have been de- 

 scribed by American authors. Galli])terus betulcecolens 

 of Riley and MonelZhas much in common with ApJiis 

 hetuUcola, Kalt. ; Callaphis hetulella of Walsh, is diffi- 

 cult to identify ; but failing other reasons, should not 

 be separated from Gallipterus on account of any acci- 

 dental absence of a stigmatic vein. This vein seems 

 to be the most persistent wing vein in all Aphides. In 

 America, Prof. Cyrus Thomas shows that these insects 

 range from the Eastern coast throughout Mississippi 

 and Illinois States. The last author notices that the 

 stigmatic veins are obsolete at their bases, which 

 peculiarity I have not remarked in the British species. 



Callipterus coeyli, Goetze. Plate LXXXVIII, figs. 



4-7. 



Aphis coryli, Goetze, Sir 0. Mosley, Kalt : 

 Gallipteriis coryli, Koch. 

 Myzocallis coryli, Pass. 



Apterous viviparous female. 



Inch, Millimetres. 



Size of body 0'070xO-030 1-77X'076. 



Length of antennse 0'050 1*27 



j> 



cornicles 0-005 012 



Smaller than G. carpini, which it somewhat re- 

 sembles. Almost white and transparent, shining ; whole 

 body tuberculate and studded with capitate bristles. 

 Eyes red. Antennae shorter than the body, ringed 



