330 Dr. H^Bltringham on a 



Escarpment (6500-9000 ft.) near Nairobi, with tlie pale 

 markings not white but retaining the primitive yellowi.sh 

 tint of Irinieni, and the broad orange marking incompletely 

 developed, so that it does not quite fill its usual area, the 

 outer end of the fore- wing patch remaining yellowish. It 

 was pointed out in the paper referred to, that this specimen 

 supported the conclusion that truplionius had arisen direct 

 from trimeni and not indirectly from it by way of hippocoon. 

 The existence of another specimen of the same form from a 

 very difl'erent locality affords confirmation. The differ- 

 ences between the two specimens are only such as are found 

 between different individuals of each of the female forms 

 of dardanus. Thus, the southern specimen from a lower 

 altitude is considerably larger, being just over 90 nun. 

 in expanse as against just under 80 nnn. ; but a small size 

 is characteristic of both males and females of dardanus 

 poJylrophus from the high Eakuyu Escarpment. The 

 southern specimen is darker and richer in colouring, but 

 this difference is intensified by its freshness ; its hind-wing 

 orange patch is squarer, with a more pronounced angle 

 in area 5, and is more encroached upon by the broader 

 black margin. A vestige of the " tail " involving the 

 lengthening of vein 4 is seen in the northern specimen but 

 not in the southern, just as it is present in some trimeni, 

 but not in others. 



In the fore-wing the band of black ground-colour between 

 the sub-apical bar and the orange patch on the imier margin 

 is about twice as wide in the southern specimen, and there 

 is also far less invasion of the cell by this orange patch. 

 Furthermore the sub-apical bar and the spot in the cell 

 are fused in the Kikuyu example, quite distinct in the 

 southern. The cell spot itself is double in the latter, single 

 in the former. 



In spite of these and other difEerences both females belong 

 to a characteristic form for which I propose the name 

 lamhorni. It may be defined as a trimeni form in which 

 the yellowish ground-colour of the main area of both wings 

 is replaced, but incompletely in the fore-wing, by orange. 

 The specimen from Ufiomi is probably more typical, and 

 I therefore select it as the type of this female form. 



The three males are all of the tibulhis form with the black 

 discal band of the hind-wing heavily marked, although not 

 so strongly developed as it commonly is in this sub-species. 

 The band of the specimens taken June 6 and June 9 shows 



