138 



The Galls of Essex ; a Contrihution to a 



be not uncommon. The gall is single-celled, and matures 

 apparently throughout the summer, when the gall-fly emerges 

 therefrom. Aphilothrix collaris, Hartig (Fig. 27) [agamous 

 form of Andricus curvator] . 



QuERcus EoBUR, L. Bud. This most remarkable gall is 

 in size and shape much like a barley-corn, but is green in 

 colour, frequently quartered with red raised stripes, and 

 occurs on a loiig, but very thin foot-stalk, though sometimes 



7 / 



Fig. 28. J^jJiilothrix calUdomu. 



almost sessile. It is developed from the axillar buds, and is 

 single -celled ; it matures in summer and autumn; the gall- 

 fly emerges therefrom in spring. Aphilothrix callidoma, 

 Hartig (Fig. 28) [agamous form of Andricus cirratus] . 



QuERcus EoBUR, L. Bud. This 

 is the most conspicuous of the bud- 

 like galls. It occurs on the twigs 

 of the oak- stubs in the spring, and 

 is somewhat oviform in shape, of 

 about the size of an orange pip ; it 

 is green, purplish or whitish green, 

 in colour, commonly covered with 

 short, whitish, longitudinally placed 

 spots ; its surface is smooth, and it is sessile in the bud, the 

 bud-scales scarcely showing ; there is a well-marked papilla 

 at the apex. The gall is single-celled ; it falls from the twig 

 to the ground in May or June, and the gall-fly emerges 

 therefrom in November. Aphilothrix albopunctata, Schlecht- 

 endal. (Fig. 29.) 



Fig. 29. 

 Aphilothrix albopunctata. 



