K. HiNDLK 275 



The name /etna le crossed witli two nut i as. 



In tho auk» o( fiunily O (J ihv foinaI<» wjih k«'|>l. with u iii.il*' r«»r 1 .'i <lavh, 

 (luring which it hiid a cfrlain nuiiihrr ulfg^rH, fmin which a niah* IiphkI 

 of 14 uialo^ wiw ri'urrd. Th»» friiiah* was (Inn i^nlatrjl for 2 ilayH and 

 Rft4?rwani8 cn»«si'(l with a ilitVcmit. inah-, thr nsult h«iii^' .shnwii in 

 fimiily O IS. Tho first a<hjlt t*\' this hioud to hatch was a mah* and lh«ii 

 foHowtMl tho thriH' fiMiiah's. 



In a second oxporinu'nt, U 14 and U ID, a teniah- pnMiuccd the hhuu' 

 tyjK' of family when crossed with two ditVcrent nwdes. 



These results are c«)nipIioat4'd by the fact that a fenude may lay 

 fertile eg^ for many days after being isolated from any male, and this 

 should be remembered when considering the results of the first ex|M'ri- 

 ment. In this example there is a strong suggestion of the exisU'Uce of 

 two ty[K»s of males, for the first individual was only male-prrxlucing, 

 whilst the second prenluced females. With reganl to the single mah' 

 that was the first to hatch in 018, it is jwssible that it may have 

 grown from an v^g fertilized by the first male parent, but in any cjuse, 

 there is a tjualiUitivc dift'erence between the two broods. 



Hemiaphroditisni. 



In view of the possible existence of hybrids of P. hunKinua var. 

 corjwris with the variety capitis, the male families in the above series 

 of exjK'riments have been carefully examined to see if any individuals 

 showed any signs of hermaphroditism, a feature which is especially 

 characteristic of hybrid races, especially in the males. In family Xli 

 one specimen exhibited a slight anal process which Dr Keilin informs 

 me is an indication of this condition, but apart from this doubtful 

 exception, no other individuals have been found which are not normal 

 in this respect. The results of these experiments cannot be explained, 

 therefore, by the assumption that parents from ditierent races were 

 employed, for, as previously mentioned, the original parents were all 

 typical corporis, and in Series 1 and 2 came from the same })iece of 

 clothing, where they must have lived side by side. 



19 2 



