On EUROPEAN SPIDERS. 169 
As we remarked above (p. 163), LAMARCK divides WALCKENAER'S 
Mygale into two genera, Avicularia and Mygale, of which the former is 
synonymous with Mygale LATR., the latter with Cteniza [LATR.] BERTH. or 
Nemesia Sav. et AuD. As type for Avicularia LAM., I propose Aranea avi- 
cularia LINN. (Ar. vestiaria DE GEER, Avicularia canceridea LAM.), partly for 
the sake of the name, and partly because it is the first species entered by 
LAMARCK under the genus Avicularia. As it was for this species and forms 
nearly related to it, that C. KocH proposed the genus Zurypelma, it will be 
to the species of that genus that the older name Avicularia ought in the first 
place to be applied. The other new genera cited in our Syn., which Kocu 
formed at the cost of WALCKENAER'S ”Mygales plantigrades”, may probably for 
the present be united with Eurypelma or Avicularia. 
I am not convinced, that any species belonging to this genus is met 
with in Europe. As however SIMON in his sub-genus Hurypelma — which he 
states to have "tarses élargis, garnis de brosses adhérentes; griffes trés- 
retractiles”, and which thus by these characteristics agrees with Avicularia 
(Law) NOB. — includes e. g. Mygale (Trechona) icterica C. KocH from 
Greece, which species is to me unknown, I consider that I ought, at least 
provisionally, to insert here the genus Avicularia.] 
Sub-ordo V. LATERIGRADJE. 
Syn.: Vid. infra sub Fam. 7homisoide. 
In their peculiar manner of moving — with about as much ease 
sideways or backwards as forwards, and with their femora depressed and 
stretehed out sideways, the following joints of the legs moving towards the 
femora in a plane more nearly approaching the horizontal than the vertical 
plane — the spiders belonging to this sub-order have a distinctive mark, 
by which, as is well known, they may usually without difficulty be distin- 
guished from all other spiders. Of the European genera, Micrommata (LATR.) 
is the only one, which has not the crab-like appearance that is peculiar to 
the other Laterigradæ. Many of the great exotic forms of this sub-order 
(especially those of the genus Heteropoda), present a striking analogy with 
certain Theraphosoide; but it is to the Drassoidæ in the sub-order Tubite- 
lariæ, that the Laterigradæ are most nearly related, and between which 
and them it is most difficult to assign the line of demarcation. Like the 
Nova Acta Reg. Soc. Se. Ups. Ser. III. 23 
