218 T. THORELL, 
Gen. 11. ATTUS (WaLck.) 1805. 
Deriv.: drrwo = dioow, move with quick, sudden motion. 
Syn.: 1805. Attus WALCK., Tabl. d. Aran., p. 22 (ad partem). 
1833. „ €. Kocu, in Hnrr.-Scumrr., Deutschl. Ins., 119, 3, 4. 
1831. »  ID., Uebers. d. Arachn.-Syst., 1, p. 32. 
1837. Euophrys ID., ibid., p. 33 (ad partem). 
1850. á ID., ibid., 5, p. 60 (ad max. part.). 
1861. Attus WEsTR., Aran. Suec., p. 543 (ad partem). 
1861. Salticus Buackw., Spid. of Gr. Brit., 1, p. 47 (ad partem). 
1864. Attus [Atta]: Sim., H. N. d. Araignées, p. 324 (ad partem). 
1868. 5 ,  ID., Monogr. d. espèces europ. de la fam. d. Attides, p. 6 (16), 
14 (24) (ad partem). 
1868. Dendryphantes ID., ibid., p. 6 (16), 168 (634) (saltem ad partem). 
Type: Attus terebratus (CLERCK). 
When C. Kocx in 1837 (loc. cit.) divided the old genus Attus WALCK. 
or Salticus LATR. into a number of smaller genera, he preserved the Wale- 
kenaerian name for a generic group that includes A. terebratus (CLERCK) and 
A. arcuatus (ID.). Since several species, which Kocu in the same work referred 
to Euophrys, ought also to be reckoned to the same genus, he some years 
afterwards transferred that appellation to the genus Attus, and gave the 
name of Attus to a portion of the species, which he had formerly called 
Euophrys. Such alterations of names no one of course can have the right 
of making, and we have accordingly restored the generic name Atéus to the 
spiders, which KocH first under that name detached from WALOKENAER'S 
Attus. Of Euophrys we have already treated p. 216. 
The genus Attus, as we have above defined it, includes the great 
majority of European Attoidz. Perhaps one or more well defined genera 
might with advantage still be detached from it; I have not however, pos- 
sibly for want of sufficient material for examination, been able to do so. As 
I define this genus, it corresponds to Kocn’s Euophrys 1850, with the ex- 
clusion of the sub-genera Dia and Parthenia, which I considered might very 
well be united into one separate genus: Ælurops. 
The armature of the claws in the genus Attus is tolerably various. 
Generally speaking the teeth of the inner claw are close-set and far more 
numerous than those of the outer claw; but occasionally, e. g. on the 4" 
pair of legs in A. erucifer, the number is small and about equal on both 
claws. Sometimes the teeth gradually and uniformly increase in length 
towards the point of the claw, sometimes they are of almost equal length 
