408 Insect Architecture. 



which is, probably, a cecidomyia. Each terminal shoot is in- 

 habited by a number of these not lodged in cells, however, 

 but burrowing indiscriminately among the half-withered 

 brown leaves which occupy the centre of the production. 

 (J.B.) 



A more remarkable species of gall than any of the above 

 we discovered, in June, 1829, on the twig of an oak in the 

 grounds of Mr. Perkins, at Lee, in Kent. When we first 

 saw it, we imagined that the twig was beset with some 

 species of the lanigerous aphides, similar to what is vulgarly 

 called the American or white blight (Aphis lanata) ; but on 



Semi-Gall of the Hawthorn, produced by Cecidomyia f drawn from a specimen. 



closer examination we discarded this notion. The twig was 

 indeed thickly beset with a white downy, or rather woolly, 

 substance around the stem at the origin of the leaves, which 

 did not appear to be affected in their growth, being well 

 formed, healthy, and luxuriant. We could not doubt that 

 the woolly substance was caused by some insect ; but though 

 we cut out a portion of it, we could not detect any egg or 

 grub, and we therefore threw the branch into a drawer, 

 intending to keep it as a specimen, whose history we might 

 complete at some subsequent period. 



A few weeks afterwards, on opening this drawer, we were 

 surprised to see a brood of several dozens of a species of 



