1454 Insects. 



is precisely in accordance with the proceedings of Osmia bicornis. 

 There is a remarkable peculiarity in the relative sizes of the sexes of 

 this insect, the males are considerably larger than the females, in some 

 instances twice the size ; this peculiarity does not occur in any other 

 species of British bee. Time of appearance June and July. 



Frederick Smith. 



List of Insects inhabiting Oak-apples. 



The well-known oak-apples are inhabited by a great variety of insects, which con- 

 stitute a little world, and derive their nourishment either immediately or indirectly 

 from those galls. The insects in the following list have emerged from a considerable 

 number of oak-apples collected in the neighbourhood of Southgate during the sum- 

 mer of 1845. 



June, 1845. 



Nitidula grisea, 1 



Balaninus glandium ? 149 during this and the following months of summer 



Forficula auricularia, a few in the summer, some of them were larvse 



Psocus subocellatus ? a few in the summer and autumn 



Atropos ? abundant till the winter 



Teras Quercus-terminalis, 495 



Synergus socialis, 27. A few specimens of two or three other species of Cynipites 

 appeared in the summer 



Pteromalus Naubolus, 7 females 



Pteromalus ? 2 males. Nearly allied to the preceding species 



Pteromalus semifascia, 1 female 



Pteromalus ovatus, 5 males 



Pteromalus domesticus, 6 or 7 females during the summer 



Eupelmus urozonus, 4 females 



Eulophus gallarum, Nees, 1 (E. Euedoreschus, Walker, Mon. Chal. i.) 



Cecidomyia ? 1 



July. 



Cecidomyia ? 2 



Tortrix viridana, 2 or 3* 



Physoevria ? 2 or 3 



Nitidula grisea, 1 

 Latridius lardarius, 1 

 Corticaria transversalis, 2 

 Carpalimus fuliginosus, 1 



Alcochara ? 2 . 



Orchestes Quercus, 4 



Pimpla ? 1 



Pimpla ? 1 



* A large caterpillar, probably of a Noctua, sometimes consumes the whole interior 

 >1 the oak-apples. 



