proved to be suitable food for lady-bird Coccinella 7-pu7ictata L., the most 

 recent investigations show it represents an unsuitable prey for S. 11-notata 

 hindering its ontogenetic development. Therefore, it appears to be necessary 

 to repeat the reactivation experiments using the aphid Aphis fabae Scop, 

 which has been verified as specific food for this coccinelhd species. 



Our results on the imaginai diapause seem to agree with the majority 

 of those by other authors as long as they relate to the same species (Dobrzan- 

 skij 1922), they disagree with others (Jachontov 1940) stating the females 

 should emerge from their hibernation quarters with mature ovaria. The pre- 

 sent results are analogic also ллdth those referring to the imaginai diapause 

 of other insect species. The investigations of various beetles revealed that 

 nearly all females hibernate with immature ovaria, males with more or less 

 mature testes: Sitona cylindricolis Fahr., Leptinotarsa 10-lineata Say, mem- 

 bers of the genus Saprinus, as well as some species of Heteroptera {Eurygaster 

 integriceps Put. and many other species). The only contradictory statement 

 refers to Agelastica alni L. the imaginai diapause of which should be without 

 gonotrophic diassociation, with mature ovaria. 



The accumulation of fat reserves, too, has been ascertained in all diapausing 

 imagoes. As to the dynamics of water, fat and glycogen during the diapause 

 our results are comparable to those of Busnel (1939) — Leptinotarsa 10-lineata 

 Say (Chrysomelidae), Edelmann (1951) — Opatrum sabulosum L. and Ana- 

 tolica eremita Stev. (Tenebrionidae), Davey (1956) — Sitona cylindricolis 

 Fahr. {Curculionidae). The water contents does not practically change during 

 the hibernation in coccinellids nor in all the above-mentioned species. The fat 

 reserves diminishing rapidly in both tenebrionid species during their hiberna- 

 tion are reduced only slightly in coccinellids, chrysomelids and curculionids 

 during this period their consumption being intensified only close before the 

 end of the hibernation. 



LITERATURE 



Andrewartha H. G., 1952, Biol. Rev. Cambridge, 27: 50—107. 



Bodenheimer F. S., 1951, Trans. 9'^ Irbt. Congr. Erbt. Amsterdam, 1: 21 — 40. 



Bvisnel R. G., 1939, Études physiologiques sur Leptinorarsa 10-lineata Say. Theses 



Fac. Sei. Univ. Paris., no. 55, 207 pp. 

 Davey K. G., 1956, Canad J. ZooL, 34: 86—97. 

 Dobrzanskij F. G., 1922, Izv. Otd. Prikl. Ent., 2: 103—123. 

 Dobzhansky Th., 1925, Z. wiss. Ins. biol., 20: 249—256. 

 Edëlman N. M., 1951, Ent. Obzor., 31: 374—385. 

 Emme A. M., 1953, Usp. sovr. biol., 35, 395—424. 

 Hodek I., 1960, Acta Soc. ent. Cechoslov., 57: 1 — 20. 

 Hodek I., Cerkasov J., 1958, Acta soc. zool. Bohemoslov., 22: 180—192. 



— — • Acta soc. zool. Bohemoslov.: in print. 



Jachontov V. v., 1940, Ekol. konf. probl. mass, razmn. zivotn. Kijev, 104—108. 

 Lees A. D., 1955, The physiology of diapause in Arthropods. Cambridge 151 pp. 



— 1956, Ann. Rev. Entomol., 1: 1 — 16. 



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