Dorothy J. Jackson 295 



Immature female, seven months old (Fig. 6, II). By this time con- 

 siderable growth has taken place and the reproductive organs differ 

 only from those of the female at the commencement of egg-laying 

 in that the ovarian tubules are only one-third the size, and are 1111 

 segmented excepting for a small portion anteriorly. Measurements: 

 ovarian tubule, 1-1 mm.; terminal chamber, 1-1 mm.; uterus and 

 vagina, 1-0 mm. 



Mature female at commencement of egg -laying (Fig. 6, III). This stage 

 has already been described. Measurements: ovarian tubule, 3-3 mm.; 

 terminal chamber, 1-3 mm.; uterus and vagina, 1-0 mm. 



Mature female towards end of egg-laying. By this time the ovarian 

 tubules have increased greatly in length whilst the other parts of the 

 reproductive organs remain the same, the terminal chamber in some 

 cases showing a slight decrease in size. About 20 segmented ova can 

 be counted in each tubule, while the anterior portion of the ovarian 

 tubule has become much attenuated and unsegmented. Measurements: 

 ovarian tubule, 6-4 mm. ; terminal chamber, 1-2 mm. ; uterus and vagina, 

 1-0 mm. 



The Life-History of Sitones lineatus as observed 

 in Foreign Countries. 



It is interesting to note that Molz and Schroder (18) consider S. lineatus 

 as being double brooded in Germany, while in Denmark Rostrup(20) 

 believes that this species has two generations in the year, the larvae of 

 one generation overwintering, those of the other generation occurring 

 in mid-summer. Kemner(2i) only refers to one generation in the year of 

 this species in Sweden, and Baranov(iT) who gives a most interesting 

 and detailed account of the life-history of S. lineatus in Russia, assumes 

 that there is only one generation in the year, as the weevils which 

 emerged in summer from eggs laid by the hibernated parents were not 

 observed to pair the same summer. 



NATURAL ENEMIES. 

 Birds. 



Poultry eat these weevils readily. At the time of harvesting the peas 

 and beans numbers of weevils are brought into the stackyard and many 

 are then picked up by poultry. Miss Ormerod recorded that starlings 

 occurred in numbers on pea fields infested by weevils. 



