136 T. THORELL, 
1864. Tegenaria: sub-gen. Philæca [Philoica] Sim., H. N. d. Araignées, p. 202 (ad 
partem). 
1868. Agrœca L. Koch, Die Arachn -fam. d. Drassiden, p. 2. 
Type: Agreca brunnea (BLACKW.) (= A. linotina (O. Kocn)). 
As regards the systematic position of this genus vid. sup. p. 118, 119. 
Concerning Phileca C. KocH v. p. 129: Gen. 7. Tegenaria. — The species of 
this genus are referred by BLACKWALL and CAMBRIDGE to Agalena, from 
which they differ widely by the totally dissimilar structure of the spinners ete. — 
In A. brunnea the female’s palpal claw is moderately curved, with 5 toler- 
ably long comb-teeth gradually increasing in length, and pointing somewhat 
forward. The two tarsal claws on the 1* pair of legs are pretty powerful, 
with about 4—6 strong comb-teeth; on the 4" pair they are thin and slender, 
much weaker and longer than those of the 1* pair, springing at a right 
or slightly acute angle from a narrow, high basement, and armed with about 
5 or 6 sparse teeth gradually increasing in length and pointing somewhat 
forwards. Thus the form of the claws on that pair differs from that which 
is usual among the Agalenoidz, and indicates that Agræca stands just upon 
the point of transition to the Drassoide. As in these latter, the tarsi have 
no inferior claw. The inferior spinners are a trifle longer and thicker than 
the superior; their 2" joint is very short, scarcely perceptible, with rather 
few, short spinning-tubes at the apex. 
Sub-fam. II. ARGYRONETINZE. 
Argyroneta aquatica seems to me to deserve to be taken as the type 
of a separate sub-family, as well on account of its peculiar habits, as of the 
structure of its respiratory organs. Argyroneta has in fact, as has been 
shown by GRUBE !) and MENGE ?), two large tracheal tubes opening close 
to each other in a transversal groove, situated a little behind the ordinary 
genital- or "pulmonary" groove, in whieh the two tracheal saes have their 
stigmata. These large air-tubes run through the petiolum into the ce- 
phalothorax, there sending out bundles of fine tracheæ into the legs, palpi 
and mandibles etc.: near the stigmata they give off two such bundles for 
the abdomen?) In certain species of Dictyna, D. arundinacea for instance, 
1) Einige Resultate aus Unters. üb. die Anat, d. Spinnen, p. 300. 
2) Ueber d. Lebensweise d. Arachn., p. 23. 
8) MENGE, loc. cit. 
