Notes on Reproductive Organs of the Pine Weevil. 169 
About the middle of September I again examined the weevils in my 
breeding cage. The condition of the ovaries is shown in Fig. 11. The ova 
are large, and some are descended into the paired oviduct; egg laying is just 
about to take place. 
In October I examined all those left in the breeding cage, but un- 
fortunately all were males. However, I have succeeded in figuring three 
stages in the development of the adult Hylobius. 
Fig. 10 depicts the unripe ovaries, which I may call the first stage. 
Fig. 1 depicts the half mature ovaries, the second stage; and Fig. 11 
represents the fully mature organs, the third stage. 
Further, from the first stage until the second stage is reached four 
months must elapse, and from the first stage till the third stage, over 
five months must intervene. 
Accordingly it is apparent that a weevil appearing in March or April 
cannot reproduce until September or October. Further, as the weevil is 
known to he resting over the winter, it is more than probable that the 
egg for a second generation cannot follow till March of the following 
year. 
Many problems must still be tackled before the life-history of Hylobius 
is clear. Is there a third brood possible, and, if so, when would it appear ? 
What period covers the life-history from the egg to the adult ? 
These two questions are the subject of my research at present, and 
I hope I may be able to shed some light on them in a later paper. 
(Issued separately, 15th September 1914.) 
