Genera of S.-American Aviculariides. 543 
6°. Protarsus of first lex not closing outside the 
lower spur. 
a‘, Protarsus of first leg closing on the 
summit of the inferior spur; a stridu- 
lating-organ between the palpus and first 
IISES 33 o.js's RACHEL UIs ORRaenS enor eaars ere Lastodora. 
6+. Protarsus of first lee closing between the 
two spurs; no stridulating-organ present. 
a’. Protarsus of fourth leg scopulate to base. Xenesthis. 
6°. Protarsus of fourth leg scopulate apically. Pamphobeteus. 
The females may be analyzed as follows :— 
a. Fourth leg much thicker and stronger than first, 
the tibia as thick as the femur; the tibia and 
protarsus strongly hirsute, the latter convex above 
SUEREICBOASO ts et cease wins y's Cavs Gis ours ane ste eisitcs Eupalestrus, nov. 
b. Fourth leg not thicker than first, the tibia much 
thinner than the femur; protarsus slender, cylin- 
drical. 
a‘, A. stridulating-organ, consisting of clavate 
plumose bristles, between the basal segments 
of the palpus and of the first leg. 
a’, A cluster of stridulating-bristles upon the 
trochanters of the palpus and first leg. 
a, No stridulating-bristles upon the coxe of 
Palpuswandenrst lesan teeters ae: Acanthoscurria. 
6*. Stridulating-bristles upon the coxee of the 
Wa hpyaMG rst CO ee ache wre teen tes Phormictopus. 
6?. The stridulating-organ consisting of a cluster 
of clavate bristles above the suture of the 
coxa of the first leg and of spines upon the 
adjacent area on the coxa of the palpus, 
none upon the trochanters .............. Lasiodora. 
b'. No stridulating-bristles present between the 
bases of the first leg and palpus. 
a‘, Protarsus of fourth leg scopulate to base .. Xenesthis. 
6*. Protarsus of fourth leg scopulate at its distal 
end. 
a. Femur of third leg enormously swollen ; 
fourth leg much longer than first ...... Megaphobema. 
6°. Femur of third leg not swollen; fourth 
lee longer than first by about the length 
of the tarsus; the patella+tibia of the 
fourth leg at most a little longer than 
NO TESS, Carblo Ge geo age GO OM OD oes Dic mete Theraphosia and 
Pamphobeteus. 
Genus ACANTHOSCURRIA, Ausserer, emend. 
Acanthoscurria, Auss. Verh. z.-b. Wien, xxi. p. 205 (1871) ; Simon, 
Hist. Nat. Araign. i. p. 157 (1892). 
Acanthopalpus, Auss. Verh. z.-b. Wien, xxi. p. 207 (1871). 
Callyntropus, Auss. Verh. z.-b. Wien, xxv. p. 181 (1875). 
In this genus there is a stridulating-organ consisting of 
