ANDRICUS OIEOULANS. 105 



Quercus sessiliflora ; the flies come out in February and 

 March, according to Mayr. 



Mayr gives Synergus melanopus and S. vulgaris as 

 inquilines. I can find no mention of any parasites 

 except Olinx trilineata, Mayr, recorded by Mayr. 



I have only found this species in Cadder Wilderness, 

 near Glasgow. 



Continental distribution : Sweden (?), Austria. 



The following gall is found at Kew Gardens on 



Quercus cerris. 



19. Andricus circulans. 

 PI. V, fig. 1, gall ; PL XV, fig. 6, <? . 



Andricus circulans, Mayr, Cyn. Gallen, 30 ; Eur. Cyn., 17. 



Black ; the coxae dark brownish ; the femora somewhat dull reddish- 

 yellow, more or less inf uscated in the middle ; the tibiae and tarsi red- 

 dish-yellow ; wings hyaline, the nervures pale fuscous ; the antenna? 

 brownish, the second joint and the base of the third paler than the 

 others. Front and vertex finely and sharply punctured ; the meso- 

 notum with the puncturing finer and more shining ; the scutellum 

 coarsely rugose ; the mesopleura? finely longitudinally striated. ? . 



Length 2 mm. 



The $ similar in punctation and colouring; the 

 antennae 14- jointed. 



The galls are found on the axillary leaf-buds of 

 Quercus cerris gregariously, one, four, or eight being 

 found in a bud ; and they may be packed so closely 

 together that they become compressed and flattened. 

 They are glabrous, well hid in the bud, in colour vary- 

 ing from brownish-yellow to bright red ; thin- walled ; 

 in shape an elongate ovoid, and in length 2 — 5 mm. 



Miss Ormerod found at Kew some galls which, 

 although not quite typical, yet still may safely be re- 

 ferable to A. circulans. My figure is taken from a 

 specimen I had from Prof. Mayr. 



According to the latter authority, the normal time 



