Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 52. (Budapest 1960)
Móczár, L.: The loess wall of Tihany and the nesting of Odynerus spiricornis Spin. (Hymenoptera, Eumenidae)
18., they should have at least 5 hours to erect a turret of 72 mm. This period is still extended by the daytime intervals. In any case, the finishing of a nest requires a whole day. The deposition of the eggs There had been only one egg in the cell of Nest Nr. 1. observed on 14 July 1938 (L. Móczár 1939), while there had lain a green sawfly larve aside of the egg in each of the cells of Nests Nr. 4. and 5. In the other cells, there had been smaller or bigger Odynerus larvae beside generally more sawfly larvae. The nest of Odynerus Nr. 1. It built its nest on 20 July 1959. On 21, it entered the cell alone, then came out shortly and turning; around, backed into it again. At 11 : 20 and at 11 : 23, it brought a sawfly larve into the turret. Then it entered the burrow "empty-handed" again at 11 : 55. The nest of Odynerus Nr. 2. Having sealed up its earlier cell (cf. p. 395.), it entered the turret at 11 : 38 on 21 July r , then appeared in 35", but it disappeared again, climbing backwards into the nest. At 13 : 35, it brought a sawfly larve into the cell. At 15 : 39, it went in empty-handed, but soon came out, and turning around, entered the nest again. I broke open this nest on 23 July (fig. 9). Of the two most recent cells, I found 7 green sawfly larvae and a small Odynerus larve in the one distant from the entrance (Cell V.), and 3 sawfly larvae and an Odynerus egg in the nearer one (Cell VI.). The wasp must have deposited its egg into cell V. after 11 : 38, and it was still provisioning it with a sawfly larve at 13 : 55. After its finish and the sealing up, it may have deposited its egg in cell VI., in the passage in front of cell V., at 15 : 39. In this case, namely, the wasp ought not have spent hours by the excavation of the fresh cell. Nest Nr. 15. The wasp came out and then backed up immediately into the freshly made turret at 13 : 10 on 23 July. Nest Nr. 17. The wasp was digging its nest from 9 : 28 till 13 : 00 on 23 July (cf. p. 396.), appearing in its entrance at 13 : 33, then it turned back on the top of the turret and climbed in backwards. Nest Nr. 21. The wasp finished its fresh nest (cf. p. 396.) on 23 July, and it turned back on the turret and retreated into it at 10 : 17 on 24 July. The wasps dig out their burrows only to a breadth, to just allow them a passage with the provisioning sawfly larve grasped to their abdomen (Plate III, fig. 9); they cannot turn back in them. This fact alone, but the above sporadic data too, strenghten the assumption that Odynerus spiricornis desposits its egg — having finished with the construction of the cell — when it has turned back on the top of the turret and retreated backwards into it ; it is only then too that it provisions the future larve with the sawfly larve store. This supports also the views ofVerhoeff (1892). The provisioning of the larvae On 20 July, the wasps carried mainly green, and seldom yellow, sawfly larvae into the injured, washed-off or broken turrets, caused by the heavy rains on the preceding days (Plate III, fig. 7—9). They were flying uncertainly to and fro on the original level of the turrets, disappearing finally in the mutilated structures. On this day, they were still carrying the sawfly larvae at 17 : 13. As soon
