TJXNEAN SOCIETY OF LONDON". ^;^ 



more centrally placed and duller, that of the hind wing narrower. 

 In the Taveta district of British East Africa, as was recorded b}'^ 

 the Rev. K. St. Aubyn Rogers *, the model is Chara.ves sntnmus, 

 and the hind-wing bar of the mimic has become clouded with 

 orange-brown to a varying degree in different individuals, while 

 the fore-wing bar has broadened and tends to suffuse the dark 

 ground-colour. 



d. A South American Heliconius Mimetic of cinotlier Species of 

 tJie same Genus. —This example is of great interest inasmuch as it 

 was detected in the fine and abundant material collected in Brazil 

 between 1825 and 1830 bv AV". J. Burchell. Fui-therinore, the 

 specimens are accompanied by statements, in the handwriting of 

 Professor Westwood and of Burchell himself, which prove that 

 the variation is so small that it escaped their attention altogether. 

 The material consists of a series of dark brown nearly black 

 buttertlies, bearing on the fore wing, beyond the cell, a broad red 

 bar, and, bet\veen the bar and the base, a median narrow yellow 

 stripe ; on the hind wing, a broad and conspicuous vellow stripe. 

 All the specimens had been labelled with Buichell's customary 

 care and precision, and on a slip of paper a*^tached to one of them, 

 tak-en Mch. 10, 1826, at Rio de Janeiro, Westwood wrote — 

 " H9 individuals in full of tliis species without any variation of the 

 least importance taken bet" 24.10.2ot & 24.3.29. See list 

 in my Burchell Catalogue." Opposite the list of dates copied 

 from Burchell's labels into the catalogue above referred to, 

 Westwood wrote " Hel. PhijlUs. 69 imP " AVhen a list of 

 Burchell's Hidiconinse was prepared for publication J by Mr. E. 

 G. Joseph, B.Sc, a few years ago, 61 specimens out of the 69 

 were found in the Hope Department, but of these one had lost 

 its label. Fifty-four of the 60 are the abundant Fabrician species 

 Heliconius erato phyWs, 42 from the vicinitv of Rio de Janeiro 

 (Aug. 16, 1825—1; Dec. 6, 1825-Apr. 1, l'8-26— 41) ; 10 from 

 Minas Geraes (Oct. 14, 1825-lS^ov. 7, 1825) ; 1 from Santos 

 (Sept. 19, 1826) ; I from Goyaz (Apr. 30, 1828). The 6 remaining 

 vspecimens belong to two subspecies of the Opisogymni, a section 

 of the genus different from that which includes erato phyllis. 

 The latter belongs to Stichel's Section II, the Opisorhypari, in 

 which the males are distinguished from those of Section I, the 

 Opisogymni. by a narrower glistening area on the under side of 

 the fore wing where it overlaps the hind. The Opisorl'.y])ari are 

 as a rule the most abundant of th(^ Heliconians and t'ley are 

 commonly mimicked by those Opisogymni which enter their areas 

 of geograpliical distribution. A single one of the remaining six 

 specimens is Heliconius ».r/ana, captured by Burchell togethei- with 

 two of its models, //. erato pJii/llis, on Dec. 6, 1825, "in an 



* Trans. Eat. Soc. Loud., 1908, p. .507, n. 



t This date is eiToneous. The earlieat date in Westwood's catalogue and ou 

 the specimens is ir).8.25. There are also other dates earlier than 24.10.25. 



+ Ann. Mag. Nat. Hist. ser. 8, vol. v., Apr. 1910, p. 322. 

 LINN. SOC. PROCEEDINGS. — ^SESSIOX 1915-1916. (I 



