152 MR. F. PICKARD-CAMBRIDGE ON NEW SPIDERS. | Feb. 17, 
that a new genus and eight new species were found, several of 
them occurring amongst those collected by myself on the Lower 
Amazons in 1895-6. 
The Spiders belonging to the Pisawride are interesting from 
the fact that they run freely and with great rapidity over the 
surface of the water, even in astrong current. One of the genera, 
Dolomedes, 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 bemg 
now in the Museum Collection. Other notes on the habits of 
these interesting Spiders will be found under the genus 7'rechalea. 
Species described or figured below. 
Thaumasia velow KW. Simon, @, p. 154, Pl. XIV. fig: 1. 
a annulipes, sp. nov., 2, p. 154, Pl. XIV. fig. 2. 
Dossenus marginatus E. Simon, @ 5 [Oe 155, Pl. XIV. figs. 3-5. 
Paradossenus nigricans, sp. nov., &, p. 155, Jel, SD figs. 6-9), 
Thanatidius spinipes, sp. nov., Q, p- 156, PL. XIV. figs. 1O=12. 
Senoculus parallelus KE. Simon, 2, p. 166, Pl. XIV. fig. 13 
es albidus, sp. nov., 2, p. LOSS PEP Xan; fies 142 
Trechalea longitar sis C. L. Koch, GO Qo jo MOO, IA, Nave figs. 13 
‘ keyserlingt, sp. nov., ° , p. 163, PL XV ericslee 2: 
5 urinator K. Simon, ¢ Q, p. 161, Pl. XV. figs. 3-5 a. 
we ellacombei, sp. nov., 2, p. 161, Pl. XV. fig. 6. 
macconnells Poc., 3, p. 162, Pl. XV. figs. 7, 8. 
connexa O. P.-Cambr., 3, p. 162, Pl. XV. figs. 9, 10. 
- extensa O. P.-Cambr., 3, p. 162, Pl. XV. figs. 11, 12. 
amazonicd, Sp. NOV., 3 ©. im 163, PEP XaVeniest 18- 20. 
Hes nyt us palustris KW. Simon, 3 @, p. 165, Pl. XV. figs, 22-25. 
» habilis O. P.- Cami... Es [Oo WOE, LI, LOWY, tee, Al 
Fam. PISAURID.. 
Synopsis of Genera dealt with below. 
A. Tibia i. with four (2-2-2-2) or five (2-2-2-2-9) 
paired spines beneath, the last pair very small and 
apical. Protarsi 1. with three or four pairs beneath. 
A!, 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 coxe Iv. 
1. 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 spies 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. 
a), Teeth on lower margin of fang-groove not 
equidistant, the 3rd more remote............__ Thawmasia Perty. 
