VARIATION. B41 



posterior end of the groove, and the tuft is there bent round, being 

 somewhat larger than the groove. The sides of the groove are also 

 rather ^thickly covered with short hairs. The organ is, of course, 

 paired, and is not present in the female. I find what is apparently a 

 very simple form of the organ on the 3rd segment of the abdomen of 

 Porthexia ftiiniliii ( aurifina}, $, but there is no trace of it in Triaeiia 

 (Acronijcta) triilem, ^ . [A similar structure is described in Xiilopliaaia 

 rurea {Brit. Xnct., iii., p. xiv).] I shall be greatly obliged if anyone 

 can supply me with references to papers whish describe this structure 

 and discuss its function. — J. F. Lister, St. John's College, Cambridge. 

 October 22ml, 1902. 



Partial double-broodedness of lepidoptera.— Dianthcecia cucu- 

 BALi. — Four newly-hatched larvae found in seed-capsules of Silme 

 injiata at Caxfcon, Jane 13th, 1899, fed up rapidly ; moths emerged 

 August, 1899 (two), June, 1900 (two). Cymatophora octogesima. — Ova 

 from Boxworth, Cambs, on June 10th, 1901, hatched June 23rd, 

 sleeved out on aspen with flower-pot attached to end of sleeve ; pot 

 brought indoors October 7th, two C. ortnf/fsima had already emerged and 

 were dead and dry, remainder emerged in due course this year. Macaria 

 NOTATA. — In 1901, larvae from Market Drayton sleeved out on birch with 

 pot attached to sleeve ; pot brought indoors October 7th, one imago had 

 emerged and was also dead and dry ; none emerged this year. — (Rev.) 

 C. D. Ash, M.A., Skipwith Vicarage, Selby. November 11th, 1902. 



Retarded emergence of lepidoptera. — The pupfe have all been 

 kept under similar conditions, viz., in a fireless unfurnished room with 

 window facing due east, and constantly open daring day. Two 

 winters in pupa : — 10 Ihymonia chaonia — none emerged first year ; 

 14 Notodonta trepida — 8 emerged first year, 4 second year ; 20 Lophop- 

 teryx cuculla—1 emerged first year, 5 second year ; Notodonta dronu- 

 dariiis ; 8 Cymatophora diiplaris — 6 first year, 2 second year ; Acronicta 

 leporina ; Cucidlia ai^te.ris ; Anticlea rubidata — 4 out of batch of 15 ; 

 Venilia maculata — the whole of a batch of 14 ; Abraxas Rylrata — 2 out 

 of 6 ; EniDielesia anifasriata ; Eiipithecia rrnomta — Shetland ; E. 

 isoyranimaria — 8 out of 30; Chesias ritfata — about half the batch. 

 Three winters in pupa: — Eiipithecia veiwsata — Isle of Man ; Ayrophila 

 trahealis — Breck district. Four winters in pupa : — Aifvophila trabealia — 

 Breck district. Five winters in pupa: — A. trabealis — Breck district. 

 I have also had Papilio wachaon two winters, and Lachneia lanestrix 

 three winters in pupa many years ago, but have no records. — 

 Ibid. 



'W' A R I A T I N . 



Plebeius ^gon ab. unipuncta, n.ab. — For the rare form of fHebcim^ 

 aecion with a basal spot to the underside of the forewings (perhaps 

 unique, since I cannot find any notice of its having been recorded 

 before, nor is any mention made of it by Messrs. Tutt, Barrett, New- 

 man, or Lang, in their books on P.ritish and European butterflies), I 

 propose the above varietal name of ab. unipuncta. The specimen 

 happens to be a ? of the ab. (et var.) Corsica form, and was taken by 

 myself at Witherslack, in July, 1901 . In addition to tiie already 

 mentioned variation, the black spots on all the four wings are large 

 and well-developed, including the metallic ones on the hindwings. The 



