| OCR Text |
Show 730 MR. R. I. POCOCK ON ETHIOPIAN SPIDERS. [June 15, HELIGMOMERUS CARSONII, sp. n. Closely allied to H. somalicus, Poc, but with the ocular area more compact, the posterior lateral eyes separated from the median laterals by a space which is less than the diameter of the latter, and the distance between the anterior median and posterior lateral not nearly twice as great as the distance between the anterior medians; distance between anterior medians equal to nearly twice their diameter; anterior lateral eyes closer to the rest, the tubercles that bear them more widely separated, the distance between them equal to the diameter of an anterior median eye, the oblong area formed by these eyes and the anterior medians a little longer than wide. Mandible armed below internally with 7 (5 large and 2 small) teeth, externally with 4 ; labium with an irregnlar marginal series of 4 teeth and about 2 behind it. Sternal sigilla situated as in somalicus but smaller. Spine armature of legs practically as in somalicus, except that there is no anterior spine on the tibia of the 4th leg. Measurements In millimetres. Total length 14 ; length of carapace 5-5, of palp 7, of 1st leg 9, of 2nd 9-5, of 3rd 9-5, of 4th 12 ; patella and tibia of 4th 4-8; patella, tibia, tarsus, and protarsus of 1st 6, of palp 5. Loc. Niomkolo, Lake Tanganyika (-4. Carson). A single female specimen. This specimen is perhaps not quite mature, and the differences it presents from the type of somalicus may be attributable to differences of age. But since there is no evidence of this fact and since the localities are widely separated, it is right to regard them as of specific value. Briefly the two forms may be distinguished as follows :- a. Distance between posterior lateral and posterior median eyes at least as great as the diameter of the latter; distance between anterior median eyes about equal to their diameters; the tubercles bearing the anterior lateral eyes close together, the distance between them less than the diameter of an anterior median eye somalicus, Poc. b. Distance between posterior lateral and posterior median less than the diameter of the latter; distance between anterior medians greater than their diameter; ocular tubercles separated by a space which about equals the diameter of an anterior median eye carsonii, sp. n. Genus ACANTHODON, Guerin. Guerin, Bev. Zool. 1838, p. 10 ; Simon, Hist. Nat. Araignees, i. p. 91 (1892). ACANTHODON MEADII (Cambr.). Idlops meadll, Cambridge, Proc. Zool. Soc. 1870, p. 152, pl. viii. fig. 4. A single specimen (type) from East Africa (Capt. Spelce). |
