DESCRIPTIONS OF OAK-GALLS. 173 



manner, then quickly stretches, and thus brings about the 

 displacement of the gall. Hitherto Dr. Giraud only has bred 

 the fly, which he obtained in small numbers, partly in the 

 following April and partly in the next October : thus a year 

 after the decideuce of the gall. — G. L. Mayr. 



This Turkey oak, and consequently non-British, species is 

 remarkable — as observed by Giraud, Kollar, and Mayr — on 

 account of the spontaneous movements of its gall, the 

 leaping larva reminding us of Dipterous habits. Sapholytus 

 Haimi, Mayr, was obtained from the year-old galls by both 

 Mayr and Haimhoflfen in May and July. With respect to 

 the appearance of the gall-flies, Dr. Giraud says he presumes 

 they were retarded, owing to the unfavourable conditions 

 under which the galls were kept. — E, A. Fitch. 



69. Neiiroterns minvtulus, Gir. — I have two leaves from 

 the collection of Herr v. Haimhoffien containing the pretty galls 

 of this species. Dr. Giraud says that these galls occur on the 

 under side of the leaves of Quercus cerris ; but the specimens 

 before me are on the fine reticulate veins of the upper side. 

 They are spherical, about the size of a pin's head (1*2 to i'5 

 millimetres in diameter), thickly covered with short conic-ovate 

 tubercles, and of a rusty brown colour. There is a larva-cell 

 in the interior. According to Dr. Giraud this gall appears at 

 the end of October. — G. L. Mayr. 



This, the smallest known oak-gall, is another Turkey oak 

 species. Dr. Mayr gives the following additional informa- 

 tion:— "On 24th October of this year (1872) I found the 

 galls of this species in great numbers near Vienna, but 

 always on the upper side of the leaf." The imago was 

 described by Dr. Giraud from a dead specimen cut out of a 

 gall. — E. A. Fitch. 



New Natural History Society. — The Borough of 

 Hackney Microscopical and Natural History Society was 

 established on the 20th March, 1877. The objects of this 

 Society are the cultivation of biological tastes in its district, 

 and communication between members through its meetings, 

 which are held twice a month, at 194, Mare Street, Hackney. 

 Country excursions arc frequently organised during the 

 season. The honorary secretary is Mr. C. Willniolt. — Ed. 



