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Show 152 MR. F. P1CKARD-CAMBR1DGE ON NEW SPIDERS. [Feb. 17, that a new genus and eight new species were found, several of them occurring amongst those collected by myself 011 the Lower Amazons in 1895-6. The Spiders belonging to the Pisauridai are interesting from the fact that they run freely and with great rapidity over the surface of the water, even in a strong current. One of the genera, Uolomedes, and another, Thalassius, have both been credited with capturing and devouring small fish of various kinds; and of the latter genus Mr. A. N. Stenning, himself formerly a gamekeeper, whose observations are likely to be trustworthy, declares that he has found members actually devouring the small fry of a variety of trout which occurs in South Africa, some of the culprits being now in the Museum Collection. Other notes 011 the habits of these interesting Spiders will be found under the genus Treclialea. Species described or figured below. Thaumasia velox E. Simon, 5 ? P* 154, PI- X IV . fig. 1. ,, annulipes, sp. nov., 2 > P- 1^4, PI. X IV . fig. 2. Dossenus marginatus E. Simon, 2 > P- 1^5, PI. X IV . figs. 3-5. Paradossenus nigricans, sp. nov., 5 , p. 155, PL X IV . figs. 6-9. Thanatidius spinipes, sp. nov., 5 5 P- 156, PI. X IV . figs. 10-12. Senoculus parallelus E. Simon, 5 , p. 166, PL X IV . fig. 13. ,, albidus, sp. nov., 2 > P- 168, PI. X IV . fig. 14. Treclialea longitarsis C. L. Koch, $ 2 , P* 160, PL X V . figs. 13-17. ,, keyserlingi, sp. nov., $ , p. 163, PL X V . figs. 1, 2. ,, urinator E. Simon, S $ , p. 161, PL X V . figs. 3-5 a. ,, ellacombei, sp. nov., $ , p. 161, PL X V . fig. 6. ,, macconnelli Poc., J , p. 162, PL X V . figs. 7, 8. ,, connexa 0. P.-Cambr., <$ , p. 162, PL X V . figs. 9, 10. ,, extensa 0 . P.-Cambr., <$ , p. 162, PL X V . figs. 11, 12. ,, amazonica, sp. nov., J $ , p. 163, PL X V . figs. 18-20. Hesydrus palustris E. Simon, J 2 , P* 165, PL X V . figs. 22-25. Kahilis O. P.-Cambr., , p. 165, PL XV . fig. 21. Fam. P i s a u r i d ^e . Synopsis of Genera dealt with below. A. Tibia i. vvitli four (2-2-2-2) or five (2-2-2-2-2) paired spines beneath, the last pair very small and apical. Protarsi i. with three or four pairs beneath. A 1. Tibia i. with four pairs of spines beneath. Protarsi i.-iv. with a single small central apical spine beneath. Sternum produced into a long narrow conical point between coxa? iv. i. Tarsi shorter, not flexible. Protarsi i. with three (2-2-2) paired spines beneath. aa. Lower margin of fang-groove with 3 teeth. a. Tibial and protarsal spines comparatively short, only two or three times as long as the diameter of the segment. * Anterior row of eyes wider than that formed by the posterior centrals. Central posterior eyes nearer to each other than to the laterals. a1. Teeth on lower margin of fang-groove not equidistant, the 3rd more remote............... Thaumasia Perty. |