122 THE ENTOMOLOGIST. 



the larva-cell in the centre. The gall-makers emerged from 

 the end of September to the middle of December. It is 

 impossible to mistake this species for the one next described, 

 — D. folii, L., — as it strictly keeps to the above-mentioned 

 oaks. — G. L. Mayr. 



The galls of this and the next species have been much 

 confounded together; but as Mayr says that the true D. folii 

 of Linne only occurs on the South European species of oak, 

 — Q. jmbescens, — it is hardly possible that it can be British. 

 1 have specimens of D. folii received from Dr. Mayr, and can 

 certainly say I never saw galls like them in this country : 

 they are spherical, as D. scutellaris, with the texture and 

 smoothness of the common D. divisa galls. Our common 

 cherry-galls must, therefore, be referable to D. scutellaris, 

 and possibly, in a few cases, to D. longiventris. They occur 

 commonly in Britain, ranging as far north as Perthshire. I 

 ibund them exceedingly abundant last autumn twelvemonths, 

 on the large sappy leaves of the stubs and pollards of the 

 Undercliff, in the Isle of Wight, from which 1 bred D. scutel- 

 laris from 1st to 21st January, Synergus pallicornis in May 

 and June, Decatoma biguttata in May, and Callimome regius 

 from May to August. Mayr mentions three species of 

 Synergus and two species of Torymus, as connected with 

 this species, viz. — Synergus pallicornis, H., appearing in 

 May of the second year; Synergus Tscheki, Mayr, in April 

 of the second year; and Sapholytus connatus, H., as inqui- 

 lines; and Callimome abdomiualis. Boh., on the authority of 

 Hartig; and Callimome regius, Nees, which occurs from 

 October of the first year throughout the summer of the second 

 year, as parasites. In the galls of this species, as also in 

 those of Cyuips glutinosa, C. Kollari, and C. lignicola, 

 Callimome regius is in some cases a parasite of the inquiline, 

 when it is generall}' rather smaller. Mayr received one 

 specimen of S. connatus from Tschek, labelled — " From 

 D. scutellaris gall;" but possibly it might ha\e emerged 

 from a gall of A. noduli, occurring in the leaf. In Germar's 

 ' Zeitschrifl' (vol. ii. p. 192), Hartig describes Neuroterus 

 inquilinus, and says: — "I once bred a single female from a 

 gall of Cyni])S lblii"= scutellaris, 01. Whether this has 

 been confirmed since, I cannot say. We often find single 

 Synergus larvae living in small chambers made in the 



