228 Mr. R. I. Pocock on 
One example, with the carapace only 4 millim. long, has the 
pads on the palpi, as well as on the legs, divided by a band 
of sete. In fact, on the fourth tarsi nearly the entire sole of 
the foot is covered with sete, which at the sides are merely 
intermixed with scopular hairs. In the adult the fourth 
tarsal pad is very visibly divided, and in the female with the 
young the pad of the third tarsus is similarly, though less 
distinctly, traversed by a row of sete. 
Phlogius oculatus, Thorell (op. cit. p. 13), from Akyab, also 
belongs to the genus Chilobrachys. The tarsi of the third 
leg, as well as of the fourth, is divided by a band of sete. 
From the above data it is evident that most of the so-called 
South-American species of Jschnocolus must drop out of the 
Neotropical fauna, and it is in the highest degree probable 
that the rest will follow in their train when the types have 
been re-examined. 'To what extent the species from the 
tropical parts of the Old World that have been ascribed to 
Ischnocolus will have to be similarly dealt with I am not in a 
position to say. 
The explanation of the strange errors referred to above in 
connexion with the identification of some of the smaller 
genera of Neotropical Aviculariide is not far to seek. The 
genera have been largely established upon the entirety or 
divisions of the tarsal pads or scopule—a character which 
was regarded by Ausserer and later on by Mons. Simon as 
being of the first importance. But if the young stages of a 
species in which, when adult, the pads are complete, that is, 
show no median divisional line of normal hairs, be examined, 
it will be found that at first the tarsi are clothed with sete, 
and these later on become intermixed with scopular hairs, 
As the animal increases in size the scopular hairs increase in 
number, gradually spreading over the tarsus, and apparently 
replacing the normal sete. But the replacement does not 
take place at a uniform rate all over the foot; on the con- 
trary, the pad, beginning at the sides, encroaches by degrees 
inwards, and, as a consequence, the last part to remain un- 
occupied is the middle line of the sole, which thus retains 
longest its primitive clothing of sete. 
In the second place, it will further be noticed that the tarsal 
pads of the four legs do not reach their full development con- 
temporaneously, the order of their appearance corresponding 
with the order of the legs from before backwards—the first 
tarsus being covered before the second, the second before the 
third, and the third before the fourth, so that when the pads 
