128 T. THORELL, 
inferior claw are short and pointed. In C. tetricus the powerful superior 
tarsal claws have about 12 long, closely set comb-teeth, the inferior 3. — 
Of both the above named species specimens have been kindly presented to 
me by Dr. L. Kocx. 
Gen. 7. CŒLOTES BLacxw. 1841. 
Deriv.: xocldw, hollow, excavate. 
Syn.: 1820. Drassus Dur., Observ. gén. sur l. Arachn., p. 9 (356) (ad partem). 
1830. 5 Warck., Faune Frang., Arachn., p. 169 (ad part.: "IV. Les Spéo- 
philes, Speophile” ). 
1833. Clubiona Brackw., Charact. of some undescr. gen. and spec. of Aran., p. 436 
(ad partem). 
11834. Aranea Reuss, Zool. Mise., Arachn., p. 210 (216) (ad partem). 
1837. Amaurobius C. Kocu, Uebers. d. Arachn.-Syst., 1, p. 15 (ad partem) 
[1840. Cavator..., Proceed. of the Linn. Soc., I, p. 66.] 
1841. Cœlotes Brackw., The differ. in the numb. of eyes etc., p. 618. 
1861. 5 ID., Spid. of Gr. Brit., I, p. 169. 
1864. Amaurobius Sim., H. N. d. Araignées, p. 138 (ad partem). 
1868. Cœlotes L. KocH, Die Arachn.-gatt. Amaur., Col. u. Cyb., p. 32. 
Type: Colotes saxatilis BLACKW. 
In a short notice of BLACKWALL’s above cited work, ” The difference 
in the number of eyes with which Spiders are provided," etc., in the Pro- 
ceedings of the Linn. Soc. for Apr. 21, 1840, we read as follows: 
"In the first tribe [Octonoculini] he proposes three new genera, two 
"of them belonging to a family, whieh he characterizes under the name of 
” Ciniflonide: these genera he also characterizes under the names of Ciniflo, 
"founded on Clubiona atrox of LATREILLE, and Operaria, comprising the 
” Theridion benignum W ALCK., Drassus exiguus BLACKW. and Drassus viridissi- 
"mus WALCK. The third genus characterized by Mr. BLACKWALL, is referred 
"by him to the family of Agelenidæ, under the name of Cavator: it is founded 
"on the Clubiona sawatilis BLACKW." 
From this we may conclude that in BLACKWALL’S above-mentioned 
paper, before it was printed, his genus Ergatis, or Dictyna SUND., was called 
Operaria, and Colotes, Cavator. Although I certainly do not think that 
an author has the right of arbitrarily changing a name, when it has once 
been published, yet in this case Cœlotes seems to me preferable to Cavator, 
and so much the more so, as no author of the notice that occurs in the 
"Proceedings" is named, and the two denominations in question, there in- 
