66 T. THORELL, 
In the above-cited passage I have more accurately determined the 
genus Uloborus so as to include only the species, which can be referred 
to the 1* and 2" Races of the 1* Family ("Les Divergentes, Deflectentes” ) 
of that genus in WALCKENAER (loc. cit). The 1* Family's 3" Race is the 
genus Æugnatha (Sav. et Aup.), of which more has been said above un- 
der the article Tetragnatha. The 2" Family ("les Ecartées, Divaricatæ” ) 
of WALCKENAERS Uloborus forms the genus Zosis WALCK. 
Durours statement, cited by LATREILLE and Lucas ?), that U. Walc- 
kenaerti has but one claw upon the three hinder pairs of legs, is entirely 
unfounded. The claws in that, as well as in the other species of this ge- 
nus, are three in number on each tarsus. In U. Walckenaerü the tar- 
sal claws are very small, but rather powerful; of the two superior claws 
the inner is considerably thicker at the base than the outer; on the 1* pair 
of legs the former has at least 5 somewhat curved comb-teeth, gradually 
increasing in length, the points of which, together with that of the claw, form 
an almost straight line: the outer has about 4 teeth, the innermost shortest, 
the others gradually increasing, and the last considerably longer than the 
rest, issuing from about the middle of the claw. The inferior claw is some- 
what shorter than the superior, short and thick, strongly curved downwards. 
In U. Latreillii THOR. there is on this claw one long sharp tooth; in UT. 
Walckenaeri I have with certainty observed such a tooth on the 3" pair 
of legs, and I think I have seen one also on the 1* pair. On the 3" pair 
the claws are shorter, curved more abruptly downwards, and provided with 
fewer teeth than on the 1* pair. 
The female’s palpus-claw is weak and of uniform thickness, slightly 
curved, with some few (in U. Latreillii about 5, in U. Coste THOR. 2 or 3) 
weak teeth pointing forwards, nearer the tip. The claws of the palpi thus 
end of the joint. They cannot be put in motion by muscles of their own, as is 
the case with the genuine claws, and are in fact to be considered merely as trans- 
formed bristles or spines. Beside in the Æpeiroidæ, I have met with these accessory 
claws in Pachygnatha, in many, especially the larger, species of Linyphia, Theri- 
dium, Steatoda ete., as also in Pholcus. (Conf. THORELL, Till kännedomen om slägtena 
Mithras och Uloborus, p. 200).—The accessory claws of Æpeira diademata have been 
described and figured already in RósEL's Ins. Belust., IV, p. 252, Tab. XXXIX, 
fig. 8; BLACKWALL has also described and figured these claws in the Zpeiroide 
(Notice of sev. rec. disc. in the struct. and cc. of spid., p. 476, Tab. XIII, fig. 4). 
1) For inst. in Cours d'Entomol., p. 527. 
2) Hist. Nat. d. Crust., d. Arachn. et d, Myriap., p. 443. 
