1884.] LEPIDOPTERA FROM ADEN. 489 



secondaries in the male have no marginal spots, and that in the 

 female these spots are very small. Major Yerbury, however, sends 

 the following note, which argues in favour of the existence of more 

 than one species here ; if by breeding he can prove this to be the 

 case, I shall not be at all distressed, though certainly surprised 

 thereby. He says : — " I fancy there are three distinct insects under 

 these two numbers (attached to specimens indicated under T. pleione 

 and var.)— first, the ordinary common male with the white female ; 

 second, the yellow females (the males I have taken in coitu with 

 yellow females seem to have the orange coming down lower on the 

 hind wing) ; and third, the males of a brighter, richer colour — these 

 are so conspicuous that one uotices them at once when on the wing. 

 I have raised one or two caterpillars ; there certainly are at least two 

 different sorts of caterpillars to be found on plant no. 23 (C'leome, 

 n. sp. ?). Only T. pleione resulted, but, at the time when I raised 

 these caterpillars, I only had one breeding-glass, so could not tell 

 what turned to what." 



I may note that a small male T. acaste "from chrysalis" was 

 labelled with the same number as T. pleione. A female T. miriam 

 was also taken in coitu with T. pleione, 3 . 



25. Teracolus ccelestis. 



Teracolus ccelestis, Swinhoe, P. Z. S. 1 884, p. 435, pi. xxxix. figs. 1, 2. 



6* $ , 6th January, ? , 23rd January, 1 884 ; 6* , 2nd March, 1 883 ; 

 $, 12th, and 6" 2," 27th March, <5 , 10 th April; Lahej, 6th April, 

 1884. 



Either this species is extremely variable or it hybridizes with T. 

 acaste of Klug, and thus produces intergrades to that species ; in 

 the absence of direct evidence I am inclined to think the latter to be 

 the case. In his recent paper on Teracolus, Col. Swinhoe regarded 

 the white females as albino varieties of his T. ccelestis, and could not 

 be persuaded to believe that they were represented by King's 

 figures ; yet these figures, though a little too black, are really not 

 bad, whereas the figures of T. pleione are not at all like anything we 

 have ever seen, and nevertheless Col. Swinhoe did not hesitate to 

 agree with me that they were intended to represent the Aden species. 



Between T. ccelestis, then, and T. acaste we have two intergrades, 

 both of them smaller in both sexes than T. ccelestis. The first of 

 these has the outer border of the primaries in both sexes broader 

 than in T. ccelestis, and the upper surface, especially of the secon- 

 daries in the female, of a paler sulphur-yellow : this 1 shall regard 

 as a simple variety of T. ccelestis reduced in size and colour by 

 crossing with T. acaste. The second intergrade differs but little in 

 the male sex from that last mentioned, excepting that the blackish 

 border is narrower and tapers more towards the external angle ' ; the 

 females, however, have lost the yellow colouring (or rather, if my 

 view be correct, have not acquired it), only the diffused pale orange 



1 I should have found it difficult to decide which were the males of this 

 form, had they uot fortunately been taken in coitu with the females. 



