| OCR Text |
Show 1902.] NEW HARVEST-SPIDERS. 409 spinous above ; trochanters not spiny; femur of 1st with some weak inferior spines, of the rest not spiny. Tarsus of 1st with 5, of 2nd with 12, of 3rd and 4th with 4 segments. $ (?). With three small tubercular spines on each side of the head-shield in front. Palpi a little larger, no spine on the dorsal side of the trochanter; femur with three strong dorsal spines, the distal one represented in the other sex obsolete, and one strong median internal spine. Distal end of protarsus of 1st leg incrassate, with the inferior distal half of the thickened area strongly emarginate. Size about the same as that of A. rostrata. Loc. Madagascar; Ambohimitombo (C. I. Forsyth Major). The specimen I have described as the male of this species is probably not quite adult. It is smaller than the other, and in the spine-armature of the palpi much more nearly resembles both sexes of A. rostrata. The other specimen I regard as the adult female, on account of the peculiar modification of the extremity of the protarsus of the 1st leg (text-fig. 83, A2), which also obtains in the specimen considered to be the female of A. rostrata. The following is a key to the known species of Acumontia:- Males. a. Free abdominal tergites furnished with a few very long spines ...... rostrata. b. Free abdominal tergites furnished with tubercles or short tuberculi-form spines. a1. Antero-lateral tubercles on the carapace very small, the posterior pair of spines on the dorsal scute close together, contiguous basally.................................................................................................................. majori. bl. Antero-lateral tubercles large; posterior dorsal spines shorter and widely separated basally ............................................................................. armata. Females. a. Two pairs of long subequal spines on posterior portion of dorsal scute; antero-lateral spines absent............................................................... rostrata. b. Posterior two pairs of spines unequal, the anterior short. a1. Posterior spines basally contiguous.......................................................... majori. 61. Posterior spines basally widely separated ............................................. armata. Genus S o ren sen e lla, nov. Distinguishable from Tricenonyx, &c. by the situation of the ocular tubercle in the centre of the cephalic scute and behind its anterior margin. Lateral branches of claws of 3id (piobably also of 4th) leg considerably longer than the median branch hence the tarsus appears to be t h r e e - clawed. Type, S. prehensor. S o r en sen e l l a pr eh en so r , sp. n. (Text-fig. 84, A, p. 410.) Colour uniformly brownish. Dorsal surface (text-fig. 84, A) tolerably smooth; anterior border of cephalic scute mesially tridentate; three lateral spines on each side, the inner the largest, the posterior lying far back |
