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Show 70 MR. R. TRIMEN ON BUTTERFLIES [Jan. 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 onlv five verv minute ones in the left O ml m fore wing, while the right fore wing was aborted, consisting only of a thickened stump. In this female alone was the peculiar abdominal 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, viz. 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 recur in the very different-looking, heavily black-marked A. violarum, Boisd. From the somewhat similar A. doubledayi, Guer., 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. ACRCEA AMBIGUA, n. sp. (Plate IX. fig. 11 $ .) Nearly allied to A. acrita, Hewits. Exp. al. (6) 2 in. 4-5 lin.; ( $ ) 1 in. 10 lin. <3 . Deep brick-red, with black spots; fore wing ivith a broad black apical patch (as in A. caldarena) immediately preceded by a white 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, |