1891.] FROM SOUTH-WESTERN AFRICA. 89 



arenaceous), but, while the fore-wing markings differ but slightly 

 from those of natalensis, in the hind wing both the transverse bands 

 are broken and irregular instead of straight and even, and the outer 

 one, instead of being wholly separate, usually touches and often 

 unites with the inner one, being strongly bent inward between 

 the subcostal nervules. The basi-inner marginal orange of 

 the underside in natalensis is wanting in homeyeri, but the sub- 

 basal spots in the hind wing are considerably or even greatly enlarged, 

 the two outermost in the latter case often touching the inner 

 transverse band (as in Dewitz's fig. 5 «). 



It is a remarkable fact that, of the ten examples collected by 

 Mr. Eriksson, the six taken in August and September are without 

 exception of very dull colouring beneath, contrasting strikingly with 

 the bright tints of the four captured in November. In the latter 

 the ground is a clear, or almost clear, pale yellow, and the markings 

 orange-red or ferruginous-red and sharply defined ; but in the 

 former both ground and markings are much altered and approximate 

 to each other in hue, especially in the hind wings, where an almost 

 uniform isabelline-sandy tint prevails. This dulness and almost 

 obliteration of the markings, except for their silvery streaks and 

 spots, are most pronounced in the female, and, like several other 

 instances recorded in this paper, appear to indicate a dry-season 

 (winter) generation in which the underside colouring harmonizes 

 with the exposed soil and withered herbage ^ 



Genus Chrysorychia, Wallengr. 

 71. Chrysorychia harpax (Fabr.). 



2 . Papilio harpax, Fabr. Syst. Ent., App. p. 829. n. 327-328 

 (1775). 



S . Chrysorychia tjoane, Wallengr. K. Sv. Vet.-Akad. Ilandl. 

 1857, Lep. Rhop. Caffr. p. 44. 



Ehanda (August and September), Okavango River (December), 

 and Omaramba-Oamatako (January). Five examples ; three males 

 and two females. 



In all these specimens the underside colouring is pale and dull, 

 and its metallic spots small and faint, while the male from 

 Omaramba-Oamatako presents the peculiarity of a rather conspi- 

 cuous dark-grey submarginal fascia in the hind wings. On the upper- 

 side they have the ground-colour of a paler red, and the males have 

 a narrower dark apical border, than more southern examples ; and 

 in all respects they resemble the Zambesian and Matabele-land 

 specimens mentioned in my ' South-iifrican Butterflies ' (ii. p. 164, 

 note). One of the two Ehanda females agrees very closely with 

 ETopflPer's figure (Peters, Reise Mossamb.,Ins. pi. xxvi. f. 2) of a 

 Querimba individual of the same sex. 



^ Mr. de Mceville (Butt. India &c. iii. pp. 354, 360, 364, 1890) gives evidence 

 tending to show that occasional dimorphism occurs in several Asiatic species of 



Aphnaus. 



