54 T. THORELL, 
the sub-genera proposed by Kocx. — Of Kocn’s above named new genera 
KEYSERLING adopts only Meta ?). 
MENGE 2), in dividing WALCKENAERS genus Æpeira, has adopted 
Kocu’s Singa, Zilla, Zygia, Miranda and Meta, as also Epeira, but not 
Atea, and has moreover formed two new genera, Cyclosa (for JE. conica) 
and Cerceis (for Singa prominens WESTR. But as he, in marking the cha- 
racteristics of these genera, fixes his attention almost exclusively on diffe- 
rences in the organs of generation, differences which do not seem to me 
sufficient to distinguish genera, I have not for the present considered 
it advisable to adopt his division entirely unaltered, more especially as, in 
many of the species, only one sex is known, and MENGE has therefore in 
some cases been uncertain whether the species really belong to the genus 
to which he has aggregated them or not. To Miranda he assigns, besides 
certain species referred to it by C. KocH, Ep. acalupha WALCK.; whereas, 
according to the characteristics given by MENGE, the following for example 
do not belong to his Miranda: Epeira armida Sav. and Aup. and JM. cero- 
pegia C. KocH (which is not identical with Z. ceropegia WALCK., as we shall 
hereafter, when we come to examine WESTRING’S Æ. ceropegia, show), al- 
though they are very nearly related to Æpeira ceropegia WALCK. and E. 
adianta ID., which MENGE assigns to Miranda. — The greatest part of the 
species, that compose KocH's Atea, are referred by MENGE, as also by us, 
to Epeira. — Zygia (Z. atrica) differs only by modifications of the organs of 
copulation from Zilla, which genus in MENGE'S work embraces only Zilla 
montana WESTR. (non KocH), described by MENGE under the name of Z. 
calophylla. The true Z. calophylla (WALCK.) C. KocH does not, according 
to the characteristics given by MENGE, belong either to Zygia or Zilla. — 
Singa prominens, which has the 4" pair of legs longer than the others, 
well deserves to be received as the type of a new genus, Cercidia NOB. 
(= Cerceis MENGE). — Ep. conica (and probably also Ar. citricola F'ORSK., Ep. 
oculata WALCK. and some others) ought to be united with Kp. opuntie DUF., 
which by the greater distance between the lateral eyes, and by the peculiar 
form of its abdomen, seems to form the type of a separate genus, Cyrtophora 
Sm. ad part. 
OnLERT?) has latterly endeavoured more accurately to determine and 
fix the genera reckoned by C. KocH to the Epeiroide, which are repre- 
sented in the Prussian fauna. He first divides them into three groups. In 
the first group (including the genera Æpeira, Singa, Miranda and Atea) 
1) Beitr. z. Kenntn. d. Orbitelæ, p. 2 (800). 
2) Preuss. Spinn., p. 41. 
3) Die Aran. d. Prov. Preussen, p. 20—21. 
