136 



The Galls of Essex ; a Contribution to a 



nut or small walnut, and greatly resembles the fruit of the 

 hop (strobile), or a miniature artichoke. It mostly occurs in 

 the leaf-axils, and consists of a much compressed, woody 

 axis, to which the hairy, brownish green, elongate scales are 



Fig. l2S.^Aphilotkrix gemma. 



attached; these enclose a hard, chocolate-brown, pear-shaped, 

 single-celled inner gall, which is about one-third of an inch 

 in length. The gall is mature in autumn, when the inner 

 gall falls to the ground ; the gall-fly emerges therefrom in 

 spring, but occasionally from one- or two-year-old galls. It 

 is commonly found on oak-stubs or young trees. Aphilothrix 

 GEMMiE, Linne. (Fig. 23). 



QuERcus KoBUR, L. Bud. The 

 gall is a small, woody, spindle- 

 shaped growth in an axillar bud ; 

 it is reddish brown in colour 

 and thickly covered with similarly 

 coloured pubescence ; at the apex 

 is frequently a smaU conical papilla, 

 and in some instances there is a 

 short, thick foot-stalk at the base. 

 The gall is single-celled, and is 

 mature in autumn, when the gall-fly emerges therefrom. 

 Aphilothrix solitaria, Fonscolombe. (Fig. 24). 



QuERcus EoBUR, L. Bud. This gall is more conspicuous 

 than any other of the smaller autumnal bud-galls, on account 



Fig. 24. 

 Aj) Idlothrix no li to ria . 



