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Show 1896.] BUTTERFLIES OF THE FAMILY HESPERIIDiE. 29 Acleros leucopyga, Mab. Grandid. Madgr. vol. xiii. p. 347, pi. liv. figs. 3, 3 a (1887); Watson, P. Z. S. 1893, p. 76. Hab. Madagascar. This species m a y be distinguished from A. ploetzi, its near ally, by the broader extent of the white markings upon the outer margin of the secondaries, and the paler, more irregularly clouded underside of the secondaries. There are two specimens in the collection of Dr. Staudinger labelled as taken at Gaboon by Mocquerys, which are almost identical with examples from Madagascar. They were taken in September. (Are the locality-labels correct in these cases ?) 108. A. PLOETZI, Mab. (Plate II. fig. 7.) Apaustus leucopygus, Ploetz, S. E . Z. vol. xl. p. 360 (1879). Acleros ploetzi, Mab. Bull. Soc. Ent. France, (6) vol. ix. p. clxviii (1889). Hab. Aburi, Victoria, W . Africa (Ploetz); Gaboon, Cameroons (Good). Mons. Mabille has very properly suggested the name ploetzi for this species, in view of the fact that the specific name leucopyga had already, in 1877, been applied by him to a closely allied species from Madagascar. 109. A. MACKENII, Trim. Pamphila ? mackenii, Trim. Trans. Ent. Soc. Lond. 1868, p. 95, pi. vi. fig. 8. Ancyloxypha mackenii, Trim. S. Afr. Butt. vol. iii. p. 331 (1889). Hab. Southern Africa. This species is very closely allied to A. ploetzi, Mab. (leucopygus, Ploetz), but may be distinguished by its somewhat larger size, and by the fact that the underside of the primaries is much darker, and by the two subtriangular spots of white standing out boldly upon this dark ground near the inner margin. 110. A. PLACIDUS, Ploetz. (Plate II. fig. 19.) Apaustus placidus, Ploetz, S. E. Z. vol. xl. p. 360 (1879), vol. xlv. p. 157 (1884). Hab. Aburi (Ploetz). The figure of the type given in the plate accompanying this article suggests that the original specimen is somewhat faded. I am greatly inclined to the view that it represents a somewhat rubbed specimen of the species since named A. biguttulus by Mons. Mabille, and which may also be identical with the species named A. substrigata by me. In a very long series of specimens, numbering nearly one hundred, I find specimens more or less worn, which agree well with the figure and description of placidus, and others which are undoubtedly very close to, if not identical with, biguttulus, and still others, bright and fresh, which are |