242 Mr. H. Mace on Butterflies on the Nile. 



The determinations have been made or checked by- 

 Captain Kiley of the British Museum, whose kindness 

 I gratefully acknowledge. I also have to thank Professor 

 Poulton and Dr. Dixey for their services in settling the 

 identity of a doubtful Teracolus. 



A few notes concerning some of the above species may 

 be worth recording, either as confirming or supplementing 

 the observations of former collectors. 



Danaus chrysippus. Comparatively few of the specimens 

 collected belong to the typical form. Dr. Longstaff 

 estimates that about half the individuals met in the 

 district are of the alcippus form, using that term to describe 

 all specimens with more or less white hind-wings. At 

 least 80 per cent, of Mr. Whitfeild's specimens come under 

 this head, but the gradation is very gentle and the majority 

 appear to be about midway between the two extremes. 

 One or two individuals are remarkable for having only 

 white rings round the discal spots. It is worth noting 

 in this connection, that the single female specimen of 

 Hypolimnas misippus sent by Mr. "Whitfeild mimics the 

 typical chrysippus. 



Form dorippus has not been taken by Mr. Whitfeild, 

 and Dr. Longstaff records only one specimen from the 

 district, so that it would appear not to be common there. 



Lampides boeticus. Taken commonly. One extremely 

 small male — 22 mm. — is worth mentioning. 



Colias hyale var. ynarnoana Rogenh. Found in abund- 

 ance. Captain Riley tells me these Khartoum specimens 

 have a very distinctive facies and might well be regarded 

 as a local race. 



Sarangesa eliminata. Dr. Longstaff says the only 

 record of this species on the White Nile is that of the 

 Swedish expedition, which took two males. The locality 

 is not specified, but he places it under the 14-16 area. 

 Mr. "VVhitfeild encountered the insect once only, finding 

 a considerable number resting in a fox earth. This singular 

 habitat seems to be general in the genus and has not been 

 explained. I have asked Mr. Whitfeild to make a special 

 effort to learn something further about them. 



Only seven of the species recorded from this section of 

 the river are missing _from the present collection. In 

 order to make the list complete, I give Dr. Longstaff's 

 records for these. 



Chilades trochilus Freyer. One at Khartoum, 1909. 



