ANDRICUS FEOTJNDATRIX. 79 



and thorax rugose ; head and thorax with a sericeous pubescence ; there 

 are two broad, glabrous, smooth longitudinal stripes on the outer half 

 of the parapsidal furrows. 

 Length 4 — 4'5 mm. 



Comes nearest to A. globuli, from which it may be 

 known by the vertex being much more strongly punc- 

 tured. 



The gall is found on young oaks as a rule, and chiefly 

 on the pedunculated form. It lies enveloped in the 

 leaf -bud, the scales of which become enormously deve- 

 loped, so as to give the gall the appearance of a minia- 

 ture artichoke, the size of which may reach three 

 quarters of an inch. At the bottom of this imbricated 

 mass is found the gall proper, which is green at first, 

 becoming brownish towards maturity ; in shape like a 

 pear, the narrow end being at the base : it is hard and 

 woody, and about 10 mm. in length. Fully developed 

 examples show a small roundish, more or less shin- 

 ing impression, with a small conical mass in the centre. 

 At first it is attached to the bud, but when mature 

 loosens itself and falls to the earth. In certain cases 

 the fly may issue in the following spring, but not un- 

 frequently the larva may remain unchanged for three 

 or four years. The number of abortive galls seems to 

 be very large, this, apparently, not being caused by 

 inquilines. Some larvae appear never to change, but 

 die in the galls. 



The inquilines are Synergus melanopus, S. apicalis 

 (but Mayr suggests that this may have come from the 

 galls of Andricus S-lineatus), S. vulgaris, and on the 

 Continent 8. evanesoens, Mayr. 



There are few parasites, the only species recorded 

 being Syntomaspis caudatus (Brischke), Torymus 

 regius, Nees (inconstans, Walker) ; Megastigmus dor- 

 salis, Fab. ; Eurytoma signata, Nees ; E. rosse, Meso- 

 polobus fasciiventris, West. ; Entedon lejptoneurus, and 

 Olinx trilineata. 



It is worthy of remark that the moth Carpocapsa 

 Juliana is a common inhabitant of the galls. 



There can be no doubt that Linne describes the 



