262 Wisco)isin Academy of Sciences^ Arts and Letters. 



Thorell substituted Marptusa in 1877); Cocalus, 1846; Plexip- 

 pus, 1846; Phidippus, 1846; Amycus, 1846; Alcmena, 1846; 

 Asaracus, 1846; (this genus, without any striking character- 

 istic, and formed for one imperfect individual, has never 

 been used); Phyale, 1846; Eris, 1846; Ciris, 1848; Msevia, 1848; 

 Rhanis, 1848 (identical with Homalattus White, 1841); Psecas, 

 1850; (this vaguely characterized genus has not been adopted 

 by later authors) ; Icelus, 1850; (the name Icelus being preoccu- 

 pied Simon substituted Icius in 1873); Ballus, 1850; (this was 

 a sub-genus of Attus, made a genus by Thorell in 1870); Dia 

 and Partheaia, two sub-genera of the genus Euophrys, were 

 combined and made a genus with the name JElurops (both 

 Dia and Parthenia being preoccupied) by Thorell also in 1870. 



During this period only one author^ beside Koch, made 

 any |:^enera in the family Attidae. This was A, White, who, 

 in 1841, made Homalattus; and in 1846 Dineresus, of 

 which Hyllus C. Koch, takes precedence; and after 1850 

 no new genera were formed for many years. Of West- 

 ring and Black wall, both writing in 1861, the former fol- 

 lowed Sundevall's division (18o3); into Salticus and Attus, 

 while the latter used only Salticus Latr. unmodified. In 

 1864, Simon combined the Attid genera to form fivei 

 Rhanis C. Koch, Attus Walck, Cyrtonota Sim., Heliophanus 

 C. Koch, and Salticus (Latr.) This arrangement, which was 

 not generally adopted, seems not to have satisfied its au- 

 thor, as in 1869, Simon made an entirely new classification 

 of the Attidae, recombining them into ten genera of which 

 two, Menemerus and Yllenus were new. 



We now come to 1870, in which year Thorell published 

 the first part of his work on the genera and species of Eu- 

 ropean spiders, probably the most important contribution 

 thus far offered to arachnological literature in the depart- 

 ment of classification. In so far as the Attidae are con- 

 cerned his most valuable work was the unravelling of C . 

 Koch's European genera. He resolved the family into thir- 

 teen provisional genera, one of which, Laptorchestes, was 

 new. He also formed the genus Diolenius for the species 

 A. phrynoides Walck.; and he made the changes in the 



