522 Rev. K. St. Aubyn Rogers' Bionomic Notes on 



^ form troplionius, Westw. This form of the female is far 

 less common thaa the liippocoon form, but it does occur at 

 Rabai, etc., and, as is well known, bears a remarkable resem- 

 blance to the Danaine model. Its flight is stronger and 

 generally more lofty, so that it can be recognised on the 

 wing, but in all other respects it is a very good mimic. 

 A new form of the female from Nairobi is described by 

 Mr. Roland Trimen in the Appendix (p. 554) under the 

 name dori2)2')oides. As its name implies it is a mimic of 

 the doripptis form. 



5. Moth Mimics. The Geometrid {Boarmiinx) moth 

 Parapty diodes tenuis should probably be associated with 

 D. chrysipims, to which in general pattern it bears much 

 resemblance. The moth is however, like the Euryphenes, 

 a forest insect. I have taken it at Ndzovuni, near Rabai 

 (July 21, 1906). 



IV. The Aletis-Euphmdra Combination in British Bast 



Africa. 



I have not as yet encountered many of the members 

 of this powerful association so closely related to the 

 chrysippus-centred combination and yet distinguished by 

 distinct and conspicuous characters of its own. The 

 probable central model in British East Africa is dis- 

 tinguished in the British Museum, as Aletis ethelinda, 

 Kirby, from the well-known south-eastern species A. lihyssa, 

 Hopff. The only apparent difference is the deeper richer 

 tint of the fulvous ground colour in the examples of the 

 more northern form in the National Collection. My own 

 specimens however taken at Rabai (a male on Oct. 13, a 

 female on Oct. 30, 1906) do not differ in this respect from 

 the southern Aletis libyssa ; and it is exceedingly doubtful 

 whether A. ethelinda can be maintained as a separate 

 species. 



The only other member of the combination I have seen 

 is E'liphmdra eleus, Drury, which I have once taken at 

 Rabai in forest countr3^ 



B. ACR^A-CENTIIED MiMETIC COMBINATIONS. 



These associations differ from those with Danaine 

 models, because of the dominant place taken by synapose- 

 matic Acrseas themselves, and consequently the smaller 

 proportion of mimics belonging to other groups. 



