S. Mahunka szerk.: Folia Entomologica Hungarica 48. (Budapest, 1987)

Table 2 . Oviposition period, longevity and fecundity of the Caloglyphus and Acotyledon species isolated as individual pairs under laboratory conditions at 28±2°C. Female Caloglyphus bérlései No. Days female Oviposition No. of deposited eggs lived period (day) Total Mean (day) 1. 23 22 1656 75 27 2. 18 17 982 57 76 3. 6 5 301 117 96 4. 20 19 722 38 00 5. 38 19 1533 80 68 6. 8 7 565 80 71 7. 17 12 429 35 75 8. 31 15 485 32.33 9. 16 12 179 14.92 10. 44 31 705 22 74 Avg. 22.1 15.9 755.7 47 52 Acotyledon krameri 1. 50 15 1012 67 47 2. 36 17 1173 69 00 3. 7 6 286 47 67 4. 45 15 1167 77 80 5. 10 9 678 75 33 6. 34 12 864 72 00 7. 18 14 671 47 93 8. 17 16 794 49 63 9. 33 15 941 58 81 10. 32 12 840 70.00 Avg. 28.2 13.1 842.6 64 32 of hypopial stages of both species. In these experiments the hypopial stage has not developed and the larvae of both species developed to protonymph, tritonymph and adult stages. The adult stage produced eggs and so on. After 4 generations, the Caloglyphus hypopi were formed, this phenomenon may be the result of overcrowding, the contamination with fungi and the lower relative humidity. In contrast with this, the hypopi of Acotyledon sp was formed after 3 generations, which may be the result of high humidity. SOKOLOV (1935) and SCHEUCHER (1959) suggested that the formation of hypopus may be correlated with mouldy of dirty food media, with some unknown "innen Faktoren" (E.TÜRK and F. TURK 1957); with the presence of two distinct types of nymphs in an average population, one of which will transform to hypopial, regardless of environmental conditions, and one which passes into the hypopial stage only when deprived of suitable food (SCHULZE 1924). E. TÜRK and F. TÜRK (1957) and SCHEUCHER (1957) feel, that the lack of moisture in the food medium prevents feeding, which in turn leads to hypopial formation. WüODRING (1969) stated that hypopi were never formed from isolated groups of less than 20 eggs, larvae or protonymphs in culture tubes, but in stock culture 1-2 % of the population usually consisted of hypopi. Dryness, overcrowding or accumulation of wastes in stock cultures usually