viii.* 



more or less, the blue-green key of colour so peculiar 

 to many of the species of the above-named genera. 

 This peculiar colour-plan seems to be confined to the 

 African continent, and chiefly to the western parts of it. 



Since writing the foregoing, and by the kindness of the 

 Hon. Walter Rothschild, I have been able to present, on 

 Plate IIIb, figures of the ? of Zalmoxis, by which it will 

 be seen that the insect so closely resembles the examples 

 of the $ , that if a number of specimens of the two sexes 

 were mixed together in a box, it would be very difficult, 

 if not impossible, to separate them except by an 

 examination of each anal segment. The peculiar colour 

 of the wings on the upper surface, the width of the black 

 border of the posterior wings, the light hairy gradation 

 from white to blue-green of the inner margin and base of 

 the same wings, the depth and prominence of the black 

 veins, the shape and arrangement of the black inter- 

 nervular rays, and the black of the anterior wing costa, 

 are absolutely identical with those of the average male ; 

 the same may be said of the marginal blue-green spots 

 of the hind wings. Of the undersides of the wings the 

 same may be observed. The lilacine white of the anterior 

 wings may be a little deeper than in the $ $ figured on 

 PI. IIIa., but then no two of the <? $ present the same 

 depth of tint. The brownish-red of the hind legs is 

 perhaps more graduated from the ochraceous brown to 

 the brick-red than in most males, and these may be 

 slightly less white, and that confined to the discoidal 

 cell ; the abdominal margin may also be more ochraceous 

 white than usual ; but I have no doubt that if we were 

 to examine a large number of examples of the two sexes 

 we should find that there would be no appreciable differ- 

 ence between a series of each sex. The head, thorax, 

 and abdomen do not differ in any respect from the $ form 

 except, of course, in the sexual character of the anal seg- 

 ment. It should be remarked here that by holding the insect 

 opposite the light in such a position that the eye can 

 view it on a level with the edge of the wings, the wing 

 nearest to the eye is seen to assume a delicate light 

 golden-pearly tone — the blue-green, or green-blue, having 

 entirely disappeared — though it may be seen on the other 

 wing. 



The example from which the figure is drawn is rather 

 larger than that of the $ of fig. i in PI. IIIa., as the 

 following measurement will show : — 



Length of costa, 81 mms. ; greatest width of primary 

 wing, 54 mms. ; length of secondary wing, 53 mms. ; 

 width, 40 mms. ; [the 3rd subcostal nervure begins just 

 below the apex of the 1st discocellular nervule.] Length 

 of the antennae or abdomen, 25 mms. ; of thorax with 

 head, 21 mms. [By an error on the previous page, 

 (column 1, the last line), the length of the thorax and head 

 of the $ is given as 11 mms.; it should however be 

 21 mms.] 



The trochanters and femora of the legs in this sex are 

 well defined with white ; the whole of the thorax on the 

 undersides is also jewelled with white spots as in the <? ; 

 the upper portion of the thorax and head also closely 

 resemble the $ ; — -or with the same plan of markings so 

 characteristic of the Danaine: and Acr^in/e, and of the 

 Papilionines, Eresias, Lycaenidse and Erycinidae which in 

 any degree mimic those protected families. 



Length of 



1st pair: femur, 11; tibia, 9; tarsi, 11 mms. 



2nd ,, : ,, 12 ; ,, 12 ; ,, 12 ,, 

 3rd ,, : ,, 11 ; ,, 11 ; ,, 12 ,, 



Hab. The label of this example has Bopoto printed on 

 it. The correct name must be Upoto, on the Great 

 Congo, in 21 55' E. long., and 2 15' N. lat. 



In the museum of Hon. W. Rothschild, and of Dr. 

 Staiidinger. The colours of the different examples of this 

 species vary sufficiently to enable the Belgian Entomolo- 

 gists to divide the species into 3 varieties, viz., the normal, 

 the green, and the grey varieties. [See page 73 of this 

 vol. A list of localities where the species has been taken 

 (as sent to me by Herr Wenig, director of the Musee 

 Royal d'Historie de Belgique, Brussels) is also given on 

 page 73 of this vol. As so much of the Congo district is 

 within the Belgian jurisdiction, our Belgian Entomologi- 

 cal brethren have had exceptionally good opportunities of 

 collecting large series of this species, and also of D. 

 Antimachus. 



