546 Mr. R. I. Pocock on some 
of the fourth by only about the length of the tarsus of the 
latter. 
Type Pamphobeteus nigricolor, Auss. (sub Lastodora). 
Hab. Colombia, Ecuador, and Bolivia. 
Genus MEGAPHOBEMA, nov. 
Differing from Pamphobeteus in that the protarsus of the 
first leg in the male closes on the outer side of the lower 
tibial spur without coming into contact with the upper spur. 
Moreover, in both sexes the femur of the third leg is much 
swollen and the third and fourth legs are longer and stronger 
as compared with the first and second, the patella+ tibia of 
fourth being much longer than of first, and the latter falls 
short of the length of the fourth by the tarsus and nearly 
half the protarsus in the female. 
Type Megaphobema robustum (Auss.) (sub Lasiodora). 
Hab. Llanos, Sta. Fé de Bogota. 
Genus XENESTHIS, Simon. 
Xenesthis, Simon, Act. Soc. Linn. Bord. 1892, p. 332; Hist. Nat. 
Araign. i. p. 160 (1892). 
As in Pamphobeteus and Megaphobema, this genus has no 
stridulating-organs at the base of the palpus and first leg. 
The protarsus of the first leg in the male passes when 
closed between the two tibial spurs as in Pamphobeteus, and, 
as in the two genera just mentioned, the femur of the fourth 
leg is covered with a scopula onits inner side. Distinctive of 
the genus is the scopulation of the protarsus of third and 
fourth legs right up to the base. 
Type Xenesthis immanis, Auss. (=colombiana, Simon). 
Genus EUPALASTRUS, nov. 
Differing from the rest of the genera of this section in the 
form of the fourth leg, which is considerably longer than 
the first and thicker, the tibia being as thick as the femur, 
only a little more than twice as long as thick, and, like the 
protarsus, studded with stiff erect bristles ; the protarsus is 
convexly elevated at the base, as high as wide, and about 
three times as long as high. 
Tibiz and protarsi of first and second legs spined apically 
beneath, the tibia with one submedian spine on the inner side ; 
tibie and protarsi of third and fourth with many spines; 
protarsus of third with its distal half scopulate, of fourth 
scopulate only on the distal fifth of its length. First leg 
