Dorothy J. Jackson 113 



Length of egg and larval stages. Eggs laid on 4th June commenced 

 hatching on June 26th. To determine the larval period eggs laid in the 

 end of May were introduced into sleeved pots of beans. From these 

 full-grown larvae and pupae were obtained on August 17th and the adults 

 commenced to emerge from August 27th to September 19th. They laid 

 no eggs till the following June. 



Parasites. 



A Braconid belonging to the genus Perilitus has been bred from an 

 adult Sitona crinifa and single Hymenopterous larvae have been found 

 on several occasions within the body of these beetles. 



The fungus Botnjtis bassiana Balsamo (Montague) attacks the adult 



beetles. 



D. SUMMARY. 



1. Sitona hispidula is common throughout Great Britain upon clover 

 and lucerne. 



2. The adults eat the leaves and the larvae damage the roots. 



3. Sitona sulcifrons is frequently abundant upon "seeds" clover and 

 the larvae feed upon the root nodules. 



4. Sitona crinita frequents tares, clover, lucerne, etc., but is rarely 

 sufficiently common to cause injury. 



5. The adults of S. hispidula are either fully- winged or brachypterous 

 and two forms of brachypterous wings have been observed in S. sulcifrons. 



6. The Ufe-history of these three species has been investigated in 

 Britain for the first time. 



7. There is only one generation in the year. 



8. The adults hve 12 months. 



9. The period of oviposition and the length of the egg, larval and 

 pupal stages varies according to the species. 



10. The Braconids Perilitus rutilus Nees, P. cerealium Hal., P. 

 aethiops Nees, Pygostolus falcatus Nees and a species of Liophron are 

 recorded for the first time as parasites of the adult beetles. 



11. The fungus Botnjtis bassiana (Balsamo) Montague attacks these 

 species of Sitona. 



