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I. THE OAK LEAF GALL FLY. 



CYNIPS QJJERCUS FOLII. 



The Antlers are hoop'd, and have a thick extremity. 

 The Trunk is bloated, and ftreak'd. 



This Infect, I received from Norway, where the oaks were in a 

 manner covered with it, in the months of July, and part of Augulr, 

 1768 ; and in our own oak-woods I have {ten fuch a Fly frequently ; 

 and found it, tho' differing a little in colour, perfectly the fame in all 

 its characters. It is a ftrong, coarfe-made, and not very handfomc Fly; 

 and is flow and heavy in its motions : and is generally found fitting 

 on the under part of a leaf, with its wings fpread out flat. 



Its Head is of a rufTet brown. 



The Eyes are blue. 



The Antlers are mottled, of black and chefnut colour. 



The Feelers are brown. 



The Jaws are fharp, jagg'd, and brown. 



Its Trunk is of a raven grey, very beautifully ftreaked with white. 



Its Body is coal black. 



The Rings dividing the Joints are brown. 



The Air-boles are dufky. 



Its Legs are grey, with ftiff black hairs, and black toes; and the 

 thigh is black. 



Its Wings are of a pale brown, with a tinge of olive-colour; the 

 Veins on them are deep grey. 



Its Tail is perfectly black. 

 The Sting is chefnut brown. 



With us the Trunk and Body of this Fly are quite black ; other- 

 wife there is no difference between fome I caught this year in Bufhy 

 Park ; and thofe I had from Norway. 



