Dorothy J. Jackson 



109 



July. In August, specimens of the old generation are rare in the field. 

 The habits of the adults are similar to those of *S'. hispidula. 



Emergence. In the breeding experiments the weevils emerged during 

 August and September and commenced oviposition on September 17th. 



Locality from which 

 parents were obtained 



Sudbury, Suffolk 

 Wye, Kent 

 Evanton, Ross-sliire 

 Wye 



II. Length of Egg Stage. 



Date of oviposition 

 Sept. 12th to Oct. 1st 

 Oct. 13th 

 Nov. 19th to 27th 

 Dec. 15th to 24th 

 May 27th to June 2nd 



Date of hatching 

 Mar. 18th to 30th 

 Mar. 22nd to 27th 

 Apr. 2nd to 12th 

 Apr. 3rd to 24th 

 June 19th to 25th 



From the above it will be seen that unUke S. hisjpidula none of the 

 eggs laid in autumn by the newly emerged beetles hatched till the 

 following spring. 



III. Length of Larval and Pupal Stages. 



The pupae occur in cells about ^ inch below the surface of the earth. 

 The pupal stage lasts about 24 days. The larvae developed as follows: 



1. From Autumn Laid Eggs. 



Locality where experiment 

 was carried on 



In pots and large breedin<j 

 cages in Ross-shire 



In breeding cage at Wye, 

 Kent 



Date of oviposition 

 Oct. and Nov., 1918 



Oct. 13th to 30th, 

 1918 



2. From Spring and Summer Laid Eggs. 



Locality 



Breeding cage, 



Ross-shire 



Data of oviposition 

 Apr. 19th to May 6th, 1919 



Pots, Ross-shire May, 1919 



June 6th to 13th 

 July 9th to 30th 



Results 



May 5th, 1919. Larvae 1-35 mm. long. 

 June 30th. Some larvae full-grown, 



one pupa. 

 July 17th to Aug. 25th. Emergence of 



imagines. 

 Larval period. About 13 weeks. 

 July 5. Full-grown larva and pupa. 



Results 



July 14th, 1919. Larvae 3-5 mm. long. 



Aug. 19th. Full-grown larvae and pupae. 



Aug. 28rd to beginning of Sept. Imag- 

 ines. 



Larval period. About 1 1 weeks. 



July 28th, 1919. Small to half-grown 

 larvae. 



Sept. 26th. Imagines. 



Nov. 23rd. Imago. 



Dec. 1st. 15 full-grown larvae, 10 of 

 them dead. None survived. 



In the above experiments larvae occurred from April to December. 

 They were most common from June till the middle of August and at this 

 Ann. Biol, ix 8 



