1903. ] MR. F. PICKARD-CAMBRIDGE ON NEW SPIDERS. 153 
b!. Teeth on lower margin of fang-groove 
GTAP eco Asdare oammes nonendeaabeonoe Tinus ¥. P.-Cambr. 
** Anterior row of eyes not wider than that 
formed by the posterior centrals. Cen- 
tral posterior eyes much further apart 
than each is from the lateral ............. Hana O. P.-Camby. 
b. Tibial and protarsal spines comparativel 
very long, the longest being quite two 
thirds the length of the whole segment... Dossenus Ki. Simon. 
bb. Lower margin of fang-groove with 4 teeth, 
HEN SILAAEILID cagcosmsncdmearito eon onSe0s600§06009 
ii. Tarsi long and flexible. Protarsi i. with four 
(2-2-2-2) paired spines beneath. 
a*, Legs subequal in pairs, 4—2 and 1—3. Man- 
dibles conspicuously gibbous above, glabrous, 
more distinctly carinate on the outer side 
(males). Lower margin of fang-groove with 
b*. Legs unequal, 4, 2, 1, 3. Mandibles not 
conspicuously gibbous above, hairy, less 
carinate (males). Lower margin of fang- 
groove with 3, 4, or 5 teeth ..................... Trechalea Thorell. 
B!. Tibia i. with five pairs of spines beneath. Pro- 
tarsi i-iv. with two apical spines beneath. 
Sternum very broad between cox iv., not 
1 VOTH TADS TEP FD] | LO)D ITs dao opsmod apnmanEbe donc odeceReSooaEsToe ? Thanatidius 1. Simon. 
B. Tibia i. with 9-10 pairs of spines beneath, the last 
pair not apical. Protarsi i. with 8 or 9 pairs of 
spines beneath .......0..0.eccccceccccscseucectsreesreeseese Syntrechalea ¥. P.-Cambr. 
Parvadossenus, gen, nov. 
Hesydrus Simon. 
If the above genera be separated by the perhaps more easily 
observed character furnished by the eye-formula, then the table 
would run as follows :-— 
A. Anterior row of eyes not or only a little wider than the posterior 
central row. CTR ith 
a. Anterior vow of eyes not wider than the posterior central row... 5 ; 
0 Dossenus. 
b. Anterior row of eyes a little, but distinctly, wider than the 
posterior central row ...... Paradossenus. Tinus. Thaumasia. Hesydrus. 
Trechalea. Syntrechalea. 
B. Anterior row of eyes much wider than the posterior central row, 
as wide as the posterior lateral row ................:0eeeeeeeeeeeeeeeees Thanatidius. 
Nore.—(1) The number of protarsal spines in some species of Trechalea ave 
difficult to locate, and the character is thus rendered less valuable. 
(2) One cannot be quite certain that Thanatidius has been correctly identified. 
(3) Tinus is closely allied to Drances Simon, but the latter has, according to this 
author, no apical pair of spines beneath tibia i. and ii., while they are present in the 
former. The name Drauces (not Drances) was used by Champion for Coleoptera 
in 1889. 
(4) In the Biologia Centr.-Amer., Arach. Aran. ii. p. 312, I have referred the 
species Hesydrus jullient Simon to Enna O. P.-Cambr. on the ground that they 
have the characters, the tarsi flexible and central posterior eyes 2 diameters apart, in 
common. This genus therefore comprises Simon’s Hesydrus Sect. 2a, while 
Hesydrus, as here diagnosed, comprises his Hesydius Sect. 1 a. 
Genus TuAumAsiA Perty. 
Del. Anim. Art. Bras. p. 192 (1833). Type, 7’. senilis Perty. 
Species recorded. 
I ME RSeTUIS: POY y OC MEL amr. ce ou cicces cn sere. ee Nae ta Brazil. 
2. 7’. marginella (C. L. Koch) ..... . (Sub Dolomedes.) 
