On EUROPEAN SPIDERS. 89 
1861. Theridium Westr., Aran. Suec., p. 151 (ad partem). 
1864. Linyphia BLackw., Spid. of Gr. Brit., II, p. 210 (ad partem). 
1864. i Sri, H. N. d. Araignées, p. 222 (ad partem). 
Type: Nestieus cellulanus (CLERCK). 
The different genera, to which CLERCK'S Aran. cellulanus has been 
referred by different arachnologists, sufficiently indicate that it does not 
fully agree with any one of them. By WALCKENAER it was first classed 
among the Thertdia, afterwards among the Linyphie. To the Epeiroid 
genus Meta, to which it is assigned by C. KocH, it of course does not 
belong. The position of the eyes is the same as in Linyphia, but their 
form, the absence of spines on the legs, and the form of the cephalothorax, 
seem to vindicate for this spider a place nearer the genus Theridium WALCK., 
and especially near Steatoda (SuND.) NoB. In the form of the maxillee it ap- 
pears to me to stand midway between Linyphia and Steatoda. Accordingly, 
as it cannot properly be united to either of these genera, I have formed a 
new genus for its reception. 
The superior tarsal claws, which are long, slender, and slightly 
curved, have in Nesticus cellulanus about 11—13 closely set, rather short 
comb-teeth, gradually inereasing in length and pointing somewhat forwards; 
the inferior has two close-set blunt teeth, of which the exterior is con- 
siderably thicker than the interior. The palpal claw has about 13 teeth, 
similar to those of the superior tarsal claws. The armature of the claws is 
thus very peculiar and different from what we meet with either in Linyphia, 
Theridium or Steatoda. 
Gen. 10. ERO (C. Kocx). 1837. 
Deriv. uncertain. ro is probably a proper name '), 
Syn.: 1805. Theridium Warck., Tabl. d. Aran., p. 72 (ad part.: "8* Fam. Les Tubercu- 
lées, Zuberculate’’). 
1837. Ero C. Kocn, Uebers. d. Arachn.-Syst., 1, p. 8 (salem ad part.). 
1861. „ Westr., Aran. Suec., p. 148. 
1864. ,,  Srw., H. N. d. Araignées, p. 182. 
1864, Theridium Buackw., Spid. of Gr. Brit., II, p. 175 (ad partem). 
1866. Ero MENGE, Preuss. Spinn., I, p. 146. 
Type: Ero tuberculata (DE GEER). 
1) Had this name been formed from ‘How, C. Kocx would unquestionably have 
written it with H. 
Nova Acta Reg. Soc. Sc. Ups. Ser. II. 12 
