70 MR. R. TRIMEN ON BUTTERFLIES [Jail. 20, 



black in male, and fuscous, marked basally with two white spots, in 

 female. Inferior corneous appendage on penultimate segment present 

 in six of the seven females, but perfect in two only ; very singular 

 in shape, its anterior margin bearing a flattened rather narrow, 

 elongate process, directed infero-posteriorly, and armed with two 

 slender acute horns or strong spines at its extremity (giving it much 

 the aspect of the forcipated abdominal extremity of a Forficula). 



The females present as much variation in marking as the males, 

 and in two examples their ground-colour is as bright. In a still 

 united pair, captured in coitu at Humbe by Mr. Eriksson, I found 

 the male to be a very well-developed and fully-marked individual, 

 while the female was the smallest taken, wanted all the black spots 

 in the hind wings and had only five very minute ones in the left 

 fore wing, while the right fore wing was aborted, consisting only of 

 a thickened stump. In this female alone was the peculiar abdo- 

 minal appendage wholly wanting, but in four others it was more or 

 less broken or distorted. 



The chief distinguishing characters of A. asema are emphasized 

 by italics in the above description, and it is interesting to find that 

 two of the most unusual of them, \\z. the subapical portion of 

 the submarginal series of spots in the fore wings and the apical 

 yellowish-white spots which occur on the underside of the fore 

 wings whenever the dark edging is sufficiently widened to contain 

 them, are features that recar in the very different-looking, heavily 

 black-marked A. violarum, Boisd. From the somewhat similar 

 A. doubledayi, Gu^r., it is easy to separate A. asema by its more 

 opaque wings and their peculiar ochre-yellow tint, by its very small 

 spots, and by the two characters just referred to as recurring in 

 A. violarum, as well as by the entire absence of any internervular red 

 marking on the underside of the hind wings ; while the female is 

 still further distinguished by the total absence of a subapical white 

 bar in the fore wings. 



Mr. Hewitson's specimens were sent by Messrs. Thelwall and 

 Simons from Lake Nyassa, where the species is stated to be rare. 



10. AcR^A AMBiGUA, n. sp. (Plate IX. fig. 11 $ .) 



Nearly allied to A. acrita, Hewits. 



EaijJ. al. ( c? ) 2 in. 4-5 lin. ; (?) 1 in. 10 lin. 



S • Deep brick-1-ed, loith black spots; fore wing loith a broad black 

 apical patch {as in A. caldarena) immediately preceded by a ivhite 

 space. Fore wing : four black spots as in A. acrita, viz., one in outer 

 half of discoidal cell, and an oblique row of three from extremity of 

 cell towards posterior angle ; subbasal spot below median nervure 

 wanting ; ground-colour in subapical area, immediately before and 

 below white space, paling into ochreous-yellow. Hind wing : 

 cellular, subbasal, and discal spots as in A. acrita, but much smaller, 

 those close to base and inner margin obsolescent, and one spot of 

 discal series (between 2nd and 3rd median nervules near their 

 origin) wanting entirely ; hind-marginal black greatly narrowed, 



