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)
At 16 : 04, it flew off again, returning in 1'15" to work in its nest. At 16 : 14, it was still hovering around its nest. It flew away finally toward the Csúcshegy at 16 : 47. At that time, it was ready with its fresh cell. According to the above observations, the wasps use the material, excavated during the construction of the fresh cells and the enlarging of the nest, for the further erection of the turret, the daubing of the passage, or for the fortifying of the inner walls of the turret. It is a frequent occurrence, however, that when the turret is high enough and its walls solid they throw off the surplus material during a short flight around the nest. The occasional raining of these small pills could be experienced standing in front of the loess wall, during the period of construction. The wasp finishes a fresh cell in an average of two hours. Feeding Odynerus Nr. 3. The wasp flew away from its turret in the direction of the Csúcshegy at 15 : 26 on 21 July, returning only next day at 10 : 40. On 22 July, and during its constructing activities, it. was absent from its nest between 12 : 03—12 : 53, and 13 : 58—15 : 13. Odynerus Nr. 9—13. They were hardly active between 13 : 45—14 : 15 on 21 July ; the construction of most of the turrets were interrupted. This was the hottest period : 42 C ! Odynerus Nr. 14. The nest-building wasp was absent between 11 : 03—12 : 40 on 22 July. Odynerus Nr. 17. The cell-excavating wasp was absent between 9 : 53—10 : 40, and 11 : 42—12 : 53 on 23 July. The intervals of an average 62 minutes between the constructing of the nests and the excavating of the fresh cells as well as the suspended activity at a relatively early time on the loess wall (wasp Nr. 3. at 15 : 26 on 21 July, at 15 : 51 on 22 July ; w r asp Nr. 23. at 15 : 47 on 23 July) allow the inference that the mud daubers visit the flowers for the sake of feeding in these periods. IV. The nest-contents of Odynerus spiricornis Spin. The majority of the three nests opened by me on 19 June, contained but dry fragments, the parasites had ravaged them in the past year. The egg brought home with me from the nest opened on 6 July (Plate IV, fig. 12) hatched on the eleventh of the month. Out of the greyish-white egg case, a 2,2 mm long larve appeared, its head of a similar color, its body r pale yellow, with only the tips of its deep-lying mandibles showing dark brown. I put 3 sawfly larvae beside it, but, unfortunately, it dried up on the third day. The turret of the nest opened on 17 July was 45 mm long (fig. 7). The burrow r ran obliquely downward for 20 mm in the wall, and then continued directly inside the loess wall. Cell I. was separated from the passage by a relatively deep stopper (10 mm). The w T all of the cell had a silky green shine. When I wanted to peel it off, it broke to pieces. Within the cell itself, there was a strongly curved yellow larve, much smaller than the cell (Plate V, fig. 16). Cell II. was similar to the first, but its position was not as oblique. Around the cocoon surrounding the yellow T larve, there were strewn around the dark heads of the consumed sawfly larvae. Cell III. was not yet sealed up. There were in it
