On EUROPEAN SPIDERS. 137 
the tracheæ have a similar distribution '). Also in Anyphena (of the family 
Drassoide), L. KocH ?) has discovered a transversal groove under the ab- 
domen, into which tracheæ probably debouch. With respect to the position 
of its stigmata, Argyroneta (as also Dictyna arundinacea etc.) is related to 
the Dysderoide, which have also 4 stigmata, of which two lead to tracheal 
tubes: but these stigmata lie, each behind the corresponding one of the 
stigmata of the tracheal sacs, at the sides of the abdomen, whereas in Ar- 
gyroneta (and Dictyna) the two tracheal tubes terminate near the middle- 
line of the belly. 
Gen. 16. ARGYRONETA LATR. 1804. 
Deriv.: @eyvoos, silver; véw, spin. 
Syn.: 1804 Argyroneta Larr., in Nouv. Dict. d'Hist. Nat., XXIV, p. 134. 
1861. á Westr., Aran. Suec., p. 367. 
1861. a Brackw., Spid. of Gr. Brit., I, p. 136. 
1864. B SIM., H. N. d. .Araignées, p. 127. 
Type: Argyroneta aquatica (CLERCK). 
In this spider the superior tarsal claws are large and powerful, al- 
most straight at the base, afterwards curved strongly and much downwards, 
with (on the 1* pair of legs) about 9—12 long, vertical, parallel comb- 
teeth, of which the 2 or 3 innermost are much smaller than the others. 
The inferior claw has 3—4 pointed teeth gradually increasing in length. 
On the remaining pairs of legs the number of teeth on the superior claws 
is somewhat less. The first half of the palpal claw shows about 6 some- 
what diverging teeth, of which the innermost is much smaller than the rest, 
Fam. IV. DRASSOIDÆ. 
Syn.: 1833. Drassides Sunp., Consp. Arachn., p. 17 (ad partem). 
1852. Cellicolæ Dotuscu., Syst. Verzeichn. ete., p. 6 (ad partem). 
In the arrangement of this family — which may be considered as 
including all not laterigrade (nor saltigrade) spiders, which are provided with 
only 2 stigmata and only 2 tarsal claws, and are destitute of a distinctly 
1) MENGE, Preuss. Spinn., III, p. 246. 
2) Die Arachn.-fam. d. Drassiden, p. 194. 
Nova Acta Reg. Soc. Sc. Ups. Ser. III. 18 
