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

slightly increased the percentage of hypopi present. In the present work, the increase of hypopi formation is related to the high relative humidity as regards the Acotyledon species, and to the overcrowding and the decrease of relative humidity in the case of the Caloglyphus mites wholly in agreement with POLEJAEV (1938), SOKOLOV (1935), SCHEUCHER (1959), E. TÜRK and F. TÜRK (1957), SCHEUCHER (1957) and WOODRING (1969). Sex ratio The sex ratio of Caloglyphus and Acotyledon mites under laboratory conditions was summarized in Table 3. This experiment was conducted by using the eggs of both species reared to adult stages. The developed adults were counted daily and removed from the population. Table 3 . Sex ratio of Caloglyphus and Acotyledon species under laboratory conditions at 28 ± 2*C Caloglyphus bérlései Acotyledon krameri No. of No. of Replicate No. of eggs males females % males % females No. of eggs males females % males % females 1. 100 6 23 20.69 79.31 100 10 37 21.28 78.72 2. 100 15 30 33.33 66.67 100 15 32 31.91 68.09 3. 52 12 24 33.33 66.67 25 2 3 40.00 60.00 4. 28 8 20 28.57 71,43 25 2 16 11.11 88.89 525 3 11 21.43 78.57 25 5 5 50.00 50.00 Total 305 44 108 28.95 71.05 275 34 93 26.77 73.23 The male and female percentages for Caloglyphus and Acotyledon

. In the breeding of these acarid mites, were found to be 28.95 %, 71.05%, 26.77 % and 73.33 % formales and females, respectively. WOODRING (1969) found that the sex ratio was 1:1 in the reared population of Caloglyphus anomalus

. Percent of hatching ^t might be seen in Table 4, that the hatching rate of Caloglyphus eggs ranged between 76.00 % and 95.08 %, with a mean of 83.99 %, while it appeared as indicated from the foregoing results, that the viability of eggs deposited by this species was apparently lower than that of the Acotyledon mite. This latter species exhibited higher fecundity (egg reproduction) compared with the former. The Acotyledon mites exhibited a high rate of egg hatching, ranging between 87.80 % and 100 %. with a mean of 93.47 %. KEVAN and SHARMA (1963) studied the effect of low temperature on the percentage of hatching of T. putrescentiae eggs, and found that at temperatures 26, 21, 17, 11,'8, 6, 2 and 0°C, the percentage of egg hatching was found to be 93.7, 90.2, 77.8, 39.4, 11.2, 0, 0, and 0%, respectively. It can be observed from the data of Table 5, that the egg stages can develop to larval stages inside the body of the last egg laying dead females. Eight dead females have been examined after their oviposition periods, the mean number of egg and larval stages found in the body of Calogly phus w

ere 4.25 eggs and 1.38 larvae. On the other hand, the mean numbers of egg and larval stages Inside the body of dead female of Acotyledon were found to be 4.63 and 0.25, respectively.