152 FOREST ENTOMOLOGY. 



and may not inaptly be compared to a miniature rifle-bullet with 

 longitudinal ridges added on. 



I have not succeeded in rearing the fly, which Adler says is very 

 difficult, and does not appear until the following April. It is very 

 common in Alnwick parks. 



Aphilothrix albopunctata (Schltdl.) 



The gall of this species is a very pretty little object, and is 

 formed in the bud (fig. 147). It somewhat resembles a small 

 acorn. It is green, spotted with red, and 

 is about 5 to 6 mm. long. The larvjB are 

 gregarious, and the gall is not chambered. 

 The galls were very common in High 

 Legh, Cheshire, and were found in May. 

 The flies hatched out about June of the 

 same year. 



Andricus ramuli (Linn.) 



This gall is known as the cotton gall, as it 

 occurs on the flower and resembles a ball of 

 cotton-wool (fig. 148). The hairs are inter- 

 woven so as to form a sort of felt. The galls 

 are many-chambered, or polythalamous. " This 



Fig. 147.-r;aW.so/Aphil- ■ ■, ii t l 



othrix albopunctata. IS by no means a very common gall. I have 

 found it twice, — once in Wales, in June 

 1891, and again in the Alnwick parks,^July 1898. The flies 

 hatch out in July. 



Aphilothrix fecundatrix, Htg. (Adler). 

 Andricus fecund atri:c, Mayr (Cameron). 



This gall is known as the artichoke gall. It very much resembles 

 a hop-flower, with imbricated scales. At first it is of a green colour, 

 but becomes brown with age. In collecting those galls when mature 

 much care is necessary to obtain the imagines. The real gall is a 

 small acorn-shaped body within these scales, but so very loosely 



