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Show 1897.] MR. R. I. POCOCK ON ETHIOPIAN SriDERS. 731 ACANTHODON THORELLII (Cambr.). Idlops thorellii, Cambridge, op. cit. p. 156, pl. viii. fig. 6. A single example (type) from S. Africa. ACANTHODON LACUSTRIS, sp. n. (Plate XLI. figs. 7-7 6.) 2 •-Colour. Carapace and mandibles deep brown; legs clearer, more castaneous, but the distal half, that is ito say from the patella to the tarsus of the palpi and first two pairs, almost piceous, and contrasting strongly with the pale colour of the femora. Carapace about as long as the patella and tibia of the 4th leg, excelling those of the 1st leg by about half the length of the protarsus; cephalic area not very strongly elevated, depressed behind the ocular cluster ; anterior median eyes separated by a space equalling above twice their diameter, the space between these and the posterior laterals greater than that; posterior medians only a little smaller than anterior medians, separated from each other by about three diameters and from the posterior laterals and anterior medians by a space which a little excels their diameter ; a line running parallel to the long axis of the body and touching the outer rim of the anterior medians would pass through the centre of the posterior medians ; posterior laterals long, elliptical, but not twice the length of the anterior medians ; anterior laterals on a double tubercle, about as wide as the anterior medians, the quadrangle they form being about parallel-sided and rather more than twice as long as wide. Armature of mandible normal; the lower border furnished with about 6 external and 6 internal teeth. Labium with 2 teeth; maxlllce toothed all up their inner edge. Sternum convex from side to side; the sigilla opposite the coxae of the 1st and 2nd legs, removed from the margin by a space which equals about half their own length. Eemora and patellae of 1st and 2nd legs and palpi unspined, though coarsely bristly ; tibiae, protarsi, and tarsi armed externally and internally with numerous spines, shorter above, longer beneath, those on the outer surface of the tibia of the 2nd are long and setiform however, similar spiniform setse being also observable on the lower surface of the patella and on the distal extremity of the femur of the palp ; patella of 3rd with about half a dozen spines in front and one above; tibia with a few spines in front and behind and one or two below ; protarsus with two series of spines above and below as well as others round the apex ; tarsus with about a dozen spines below and at the sides ; patella of 4th with a cluster of spines in its basal half in front, tibia unspined though with a few setiform spines below, protarsus strongly spined in its distal half below; tarsus strongly spined below and at the sides. Claws armed with a single strong tooth. Measurements in millimetres. Total length 19 ; length of carapace 9; of palp and of 1st leg 18-8, of 2nd 16, of 3rd 16, of |
