158 fJ"''-' 



between each oviposition was G'13 clays, with a maxunum of 14 and a 

 minimum o£ 4 d^js. 



The female deposited on the day following the carrying of the egg- 

 capsule, that is when it appears quite clear of the aodomen and is held 

 by the anal claspers. Cockroach No. 1 made five deposits in 25 days, 

 and probably her death was premature. No. 2 made twelve deposits in 

 59 daj^s. Nos. 6 and 7 made five deposits each in 32 and 25 days 

 respectively, but ceased to lay after the death of male No. 5. 



The young emerge from ihe egg-capsule in 33-37 days, or in an 

 average period of 35 days. Each egg-capsule contained alwut IG j^oung, 

 but the average number that emerged was 12; the undeveloped speci- 

 mens could be seen in their respective cells in the egg-capsule. 



On January 19th, a brood of young cockroaches emerged from an 

 egg-capsule. These were reared but no full record of the moults was 

 kept. On May 2nd to the 4th these insects matured, and on tbc 18th 

 and 19th respectively two females dej^osited. The period from emergence 

 to maturity was 103 days approximately. Another brood was hatched 

 on June 6th, and reached maturity in GG to 85 days. The brood was fed 

 very regularly and with great care. It is quite obvious the growth of 

 these insects can be retarded or quickened by feeding. During develop- 

 ment only one empty skin was noticed, so it is indicated that they 

 devour the cast skin after each moult. 



Though males were often seen attentive to females, the cockroaches 

 were never seen in copula ; probably their mating takes place at 

 night. 



To ascertain whether a separate mating was necessary for the pro- 

 creation of each particular brood, four newly matured females were 

 confined with a corresponding number of males, and were not separated 

 until each female was seen to be carrying her fii'st egg-capsule ; from 

 that time the males were deprived of further access to the females. 



The first cockroach lived 48 days after the male was taken away, 

 and during that time deposited 9 egg-capsules ; the second lived 46 days 

 and deposited 8 egg-capsules ; the third lived 31 daj^s and deposited 

 5 egg-capsules ; the fourth dejiosited 8 egg-capsules and lived 52 da3's. 

 With the exception of 5 which dried up, the above egg-capsules were 

 fertile and young cockroaches emerged therefrom. 



