148 THE ENTOMOLOGIST. 



Britain, ahbougb, doubtless, like all tbe Dryopbanta galls, it 

 does occasionally occur in profusion ; but it is Divisa wbicb 

 is so often met witb, and in sucb great numbers. 1 bave in 

 my collection a small twig witb eleven leaves, ou wbicb are 

 ninety-four galls; and I believe Mr. Newman bad sjiecimens 

 of leaves more densely populated tban tbat. Tbe range of 

 Divisa in Britain is comn)ensurate with tbat of tbe oak. 

 Does Scblecbtendal, in bis notes, refer in part to Divisa? as 

 be only mentions Disticba and Agama in tbe ' Zeitung,' from 

 wbicb we migbt infer tbat be bad not tben separated tbe two 

 species, Agama and Divisa; for in Mayr's two essays on tbe 

 Synergi and Torymidas vve bave tbree species of Synergi and 

 two species of Torymida?, bred by Scblecbtendal from Divisa 

 galls ; and only one species of Synergus, and none of tbe 

 Torymida3, from Agama or Disticba; clearly showing tbat 

 Divisa must occur in Saxony, and, from tbe above, might 

 reasonably be considered the commonest species of the 

 tbree. Formerly be migbt bave been following Hartig, who 

 says of Agama, — " Sometimes in very great numbers on the 

 leaves of young oaks;" and of Divisa — "Not common, near 

 Brunswick." Under Agama we also bave from Scblecbtendal 

 some interesting remarks on tbe inmates of tbe galls ; be 

 says — " Out of one hundred galls, which I collected for 

 breeding from, eighty-eight were fully matured, and twelve 

 remained small : the former onl}' produced twelve specimens 

 of the fly, and ten parasites and inquilines, in the same year; 

 tbe remaining sixty-six wintered, and produced in the spring 

 partly Pteromalidae and partly Synergus species; no Cynips. 

 Of tbe twelve small galls three produced parasites and inqui- 

 lines in tbe same autumn ; the remaining nine wintered." 

 Here, again, vve have evidence of Divisa, as reference is made 

 to inquilines, both in autumn of the first year and spring of 

 the second ; a state of things, according to Mayr, existing 

 commonly but in Divisa, where vve bave Synergus albipes 

 occurring in August of the same year, and Synergus Tscheki 

 and S. pallicornis in March and April of tbe second. All 

 tbree species were received from Scblecbtendal ; S. palli- 

 cornis, also, from Reinhard (Saxony). In the 'Scottish 

 Naturalist' (vol. ii. pp. 62, 161) Mr. Cameron has two notes 

 on tbe mode of life of Synergi in these galls. Tbe recorded 

 parasites of this species are — Synlomasjjis cyanea, Boh., 



