164 T. THORELL, 
1. Theraphosa (WALCK.) = Mygale (WALCK.) C. Kocn; 2. Avicularia (LAM.) 
= Eurypelma (C. Kocn); 3. Trechona (C. Koch), and 4. Diplura C. Kocn. 
The first-named two genera together answer to WALCKENAER'S ” Plantigrades”’, 
the latter two to his " Digitigrades inermes". ” Les Mygales (Digitigrades) 
mineuses” ought to be called Nemesia Sav. et AuD. — The family Mygali- 
des we call, in conformity with the method, in which we have formed the 
other family-names, Theraphosoide. 
If the genus Atypus have really, as LATREILLE ') and DUGES ?) ex- 
pressly state, siz spinners, and not only four, as WALCKENAER ?) says, that 
genus ought to be made the type of a separate sub-family, Atypine, in 
contradistinetion to the ordinary Theraphosoidæ (Theraphosine), which are 
provided with only four spinners. Also in Eriodon formidabile CAMBR. the 
spinners, according to CAMBRIDGE‘), are 6 in number. According to Lucas >) 
however the oldest known species of that genus, E. occatorium (WALCK.), 
has only two pair of spinners (?). 
The European genera included in the family Theraphosoide are the 
following: 
A. Maxille versus basin dilatatæ: palpi dilatationi lateris affixi. Cephalothorax 
Estoy en vut, GLEN 6 os 6 5 o o 6 S 9e np o de Apes 
B. Maxille angustæ, sub-cylindrate; palpi apici earum inserti. 
a. Area oculorum 2+—3-plo latior quam longior. Cephalothorax antice alte 
elevatus. Pedes breves, robusti, 3" paris reliquis breviores. 2. Cyrtauchenius. 
b. Oculi conferti, eminenti: communi parvæ impositi; area, quam occupant, 
c:a dimidio — duplo tantum latior quam longior. 
I. Mandibule ad apicem dentibus vel lamellis eorneis liberis, rastellum vel 
pecten formantibus, armate. Pedes apicem versus plus minus attenuati ; 
ungues ipsi apiei tarsorum inserti. . . . . . . . . 9$. Nemesia. 
II. Mandibulæ rastello carentes. 
* Pedes versus apicem attenuati, unguibus ipsi apici tarsorum insertis. 
1. Mamillæ superiores (posteriores) articulis quaternis. . 4. Diplura. 
2. Mamillæ superiores articulis trinis. . . . . . . . 5. Trechona. 
[** Pedes robusti, versus apicem vix vel parum attenuati, unguibus supra 
apicem farsi insertis, retrahendis. . . . . . . . 6. Avicularia.] 
1) Cuv., Régne Anim., 2° Éd., IV, p. 228. 
2) Observ. sur les Aran., p. 197; Cuv., Régne Anim., 3° Éd., Arachn., p. 31, 
PI. 5, fig. 20. 
3) Hist. Nat. d. Ins. Apt., I, p. 245. 
4) Deser. of a new gen. and six new spec. of Spid., p. 267. 
5) Obsery. sur le genre Eriodon, p. 316. 
