554 Appendix to Rev. K. St. Aubyn Rogers' Bionomic 



African butterflies are found to meet and intergrade in the 

 Eastern equatorial belt. 



The known range of P. trimenii is now a wide one, 

 extending from Port Natal along the East Coast to 

 Mombasa, and thence inland to " Taveta (K. St. A. Rogers), 

 captured December 2nd, 1905 " [^ in Hope Department], 

 and Kibwezi (C. W. Hobley) captured in April 1907. 



Family PAPILIONID^. 



Sub-family PAFILIONIN^. 



Papilio dardanus, Brown, sub-sp. tibullus, Kirby, $ form, 

 nov. dorijypoidcs. 



Exp. al. 3" 8'" (one example).* 



Nearest to the $ form tropJionius, Westw., hut ivith the 

 waTin-fulvo^ts colouring of hothforc- and hind-ioings greatly 

 extended, causing a correspondingly large reductioa and 

 obsolescence of usual fuscous area in fore-wing, and a 

 similar but less pronounced condition of the hind-marginal 

 fuscous border in hind-wing. Fore-wing : fuscous restricted 



* This expanse is decidedly greater than that attained by Kikuyu 

 examples of the sub-species polytrophus, Jord., that I have measured, 

 which vary ( ^ ) from 2" 10'" to 3" 5'", and ( $ ) from 3" 2"'-5"'. In size 

 the new 5 form dorippoides thus more aj^proaches that of the Eastern 

 sub-species tibullus, and of the Southern sub-species cenea, in which 

 both sexes have an expanse varying from 3" 7'" to 4" 3'". Typical 

 P. dardanus from West Coast is larger than any of its sub-species, 

 both sexea expanding from 4" to 4" 6'" ; — one very large ^ from 

 Fernando Po (with extremely wide black border to the fore- wings) 

 attaining an expanse of 5". 



[I think that the sub-species is the Eastern tibullus, Kirby, and not 

 polytrophns. The latter is found at the higher elevations. The two 

 Nairobi specimens (about 5500 ft.), represented on Plate XXVIII, 

 Figs. 6 and 7, are also much larger than polytrophus, while the male 

 (Fig. 7) has the black hind-wing band of tibullus and not that of the 

 former sub-species. It is probable that in the Nairobi district tibullus 

 occurs at the lower elevation — about 5000-6500 ft., yfhilt polytrophus 

 captured by Doherty is labelled 6500-9000 ft. There is little 

 doubt that the two areas overlap, and that the two sub-species meet 

 and freely interbreed ; furthermore that the resemblance of dorip- 

 poides to specimens oi polytrophus is to be explained thereby. 



Since the above note was written, Mr. Rogers has informed me 

 that a trimeni female form recently taken by him at Nairobi, belongs, 

 he believes, to the large tibullus sub-species rather than the small 

 polytrophus. E. B. P.] 



