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Show 846 MR. R. I. POCOCK ON SCORPIONS, PEDIPALPS, [Nov. 14, ? HETEROTHELE GABONENSIS (Lucas). Mygale gabonensis, Lucas, Arch. Ent. 1858, p. 382. ? Diplura longipalpis, Karsch, Zeits. Naturwiss. (3) iv. p. 564. Two female specimens of a species referable to Heterothele, obtained by G. L. Bates on the Benito Biver, are regarded as probably identical with Mygale gabonensis, Lucas. Family CTENIZIDCE. Genus ACANTHODON, Guer. AOANTHODON ANGUSTICEPS, sp. n. 2 . Very closely resembling, both in size and spine-armature, &c, A. lacustris, Pocock (Proc Zool. Soc. 1897, p. 731, pl. xii. fig. 7), from Lake Tanganyika. The two species may be separated as follows:- a. Carapace broader as compared with its length (7*8 :9), width equal to the distance between the posterior border and the anterior border of the ocular cluster ; the two ocular tubercles higher, the area behind the posterior considerably more depressed owing to the greater elevation of the cephalic prominence; sternum wider as compared with its length (4'8: 5 ) ; legs longer, length of 1st 18*8, of 4th 23, tarsus and protarsus of 4th 8 ; palp from base of femur 16, its three distal segments 9-8 lacustris Poc. b. Carapace narrower, its width as compared with its length being 6"8 : 9, width equal to the length between the posterior border and posterior edge of the ocular tubercle; ocular tubercle lower, but little elevated, area behind the ocular cluster but little depressed; sternum narrower, very distinctly narrower than long (4:5); legs shorter, length of 1st 17, of 4th 22, tarsus and protarsus of 4th 7 ; of palp 15, its three distal segments 9 anyusticeps, sp. n. Slight differences also are observable in the eyes, the posterior medians being a little closer together, more directly behind the medians and a little farther from the laterals. I have very little confidence, however, in tbe taxonomic value of slight apparent differences in the size and relative positions of these organs. Loc. Benito Biver (G.L. Bates). A single female example was procured. ARAOHNOMORPHciE. Family DINOPIDCE. Genus DINOPIS Macleay. DINOPIS BUBO Brit. Capello. Dinopis bubo, Brit. Capello, Mem. Ac. Sci. Lisboa, (3) iv. pt. Arachnideos etc. p. 16, pl. ii. fig. 3. |