90 T. THORELL, 
We take this genus, formed by C. KocH, in the extent which WEs- 
TRING has assigned it, and accordingly cannot include in it Ero sawatilis 
C. KocH, which is a Theridium (= Th. riparium BLACKW.). — The tar- 
sus in this genus shows at least some appearance of a little separate joint 
bearing the claws, and by this, as well as by its highly convex cephalothorax, 
Ero shows an evident analogy with Scytodes. — The superior tarsal claws are 
weak, sharply bent downwards, with 3 or 4 small teeth towards the base; 
the inferior claw appears to me to have only one little tooth. The palpal 
claw has the same form as the superior claws of the tarsi, and 3 or 4 teeth 
rapidly increasing in length and directed somewhat forward, situated nearly 
under the middle of the claw (in Æ. variegata). 
Gen. 11. PHYLLONETHIS x. 
Deriv.: gvddov, leaf; vydis, spinner. 
Syn.: 1805. Theridium Watck., Tabl. d. Aran., p. 72 (ad part.: "1* Fam. Les Ovales, 
Ovatæ”). 
1837. Steatoda C. Kocx, Uebers. d. Arachn.-Syst., 1, p. 16 (ad partem). 
1861. Theridium Westr., Aran. Suec., p. 151 (ad partem). 
1864. D Buackw., Spid. of Gr. Brit., II, p. 175 (ad partem). 
1864. ? sub-gen. Steatoda [Steatodum] Sim., H. N. d. Araignées, p. 167. 
1866. a MENGE, Preuss. Spinn., II, p. 164. 
Type: Phyllonethis lineata (CLERCK). 
CLERCK'S Araneus lineatus differs so largely from the typical The- 
ridia (if we consider as such Th. sisyphium, varians, and their nearest re- 
lations) that, unless the great genus Theridium WALCK. be preserved un- 
divided, it can hardly be classed among them. WALCKENAER himself formed 
for this species a special "family" of his Theridium: C. Kocx formed 
for it a separate genus, to which he erroneously affiliated Th. pictum WALCK., 
a spider which accurately agrees with the above-mentioned typical species 
of Theridium. MENGE, who adopts the new genus, restricts it to the spe- 
cies in question, Ar. lineatus CLERCK. By C. KocH it has been denomi- 
nated Steatoda, which name however belongs to quite another group of The- 
ridioidæ (see Gen. 14. Steatoda, p. 93). MENGE calls it Theridium, but 
that name had previously been by SIMON reserved for Th. sisyphium and 
its nearest allied species (which again are by MENGE taken up under the 
name of Steatoda), and ought, according to the law of priority, to be preser- 
ved to them. I have therefore been obliged to give the genus a new name. 
