542 Mr. R. I. Pocock on some 
including the species subsequently referred by him to Avicu- 
laria and Tapinauchenius. In view, then, of the obscurity 
in which Hurypelma is wrapped, I have ignored it altogether 
in the following pages as a “‘ genus tgnotum,” at all events 
for the time being. 
Several other genera of the group are unknown to me, 
e. g. Planadecta, Rhechostica, Grammostola, and Agathostola. 
The latter, however, is certainly nearly allied to Homaomma, 
Auss. (nec Homa@omma, Sim.) ; and both Homeomma, Sim., 
and Grammostola, Sim., are possibly identical with the genus 
I have described as Citharoscelus (Ann. & Mag. Nat. Hist. 
(7) 11. p. 347, 1899). It is hoped that the types of these 
genera will be re-examined with reference to the hairy 
clothing of the base of the legs and palpi, so that they may 
be established on a securer basis. 
Part I.— The Genera of the Section ““'Theraphosex”’ 
of Simon. 
Simon’s table of the genera of this section is satisfactory 
only so far as the male characters are concerned. He admits 
five genera: Acanthoscurria, Theraphosia*, Sericopelma, 
Xenesthis, and Lasiodora. In my opinion the differences 
between Theraphosia and Serzcopelma are only of specific 
importance, whereas the species assigned to Lastodora - 
represent four distinct genera. To these I have to add the 
new genus Hupalestrus, which is, however, merely included 
here on account of the scopulation of the femur of the fourth 
leg. It differs from all the known South-American genera in 
the form of its posterior legs. Until the male comes to hand 
there is no prospect of locating the genus more accurately. 
The males alone may be classified mainly by the struc- 
ture of the first legs as follows :— 
a. Tibia of first lee without a spur .............. Theraphosia. 
6. Tibia of first leg with one or two spurs. 
a. Tibia of first leg with one spur on the inner 
side; a spur on tibia of palp .............. Acanthoscurria. 
6’. Tibia of first leg with two spurs, a larger 
inferior and a smaller superior; no spur on 
tibia of palp. 
a”, Protarsus of first leg closing on the outer 
side of the lower spur. 
a’, A stridulating-organ between the base of 
the! palpus and first lee cess ce ate Phormictopus. 
6°. No stridulating-oryan in this position..,. Megaphobema. 
* I here adopt Dahl’s name instead of ‘“ Theraphosa,” Walck., the 
destiny of which has yet to be settled. 
