72 
Annals of the Transvaal Museum 
its anterior side stretching only half-way along the segment though an odd 
spine occurs in the naked area of the distal half. Tibia IV without spines on 
the anterior surface. 
Chelicerae with a single row of teeth below and at the base thereof a 
single rather large tooth internally situated. 
Ocular area subequal to or very slightly longer than one-third of the 
distance from the anterior margin of the carapace to the fovea : frontals about 
one-sixth of a diameter apart, not projecting strongly from the front margin 
of the carapace: posterior medians only very slightly nearer to the laterals 
than to each other, the distance between the medians about equal to 
diameters. The head region of the carapace is marked with three longitudinal 
blackish lines, two of them tangential to the posterior-lateral eyes, and one of 
them being median: posteriorly they terminate at a point about midway 
between the ocular area and the fovea: the membrane at the margins of the 
carapace is also deeply pigmented. 
Measurements. Total length 15, length of carapace 4-75, breadth of 
carapace 3*75. 
The female resembles that of A . crudeni mihi, but, apart from the several 
minor structural differences which might not seem sufficient for specific 
separation on female characters alone, the two may be easily distinguished by 
the darker pigmentation of nigropilosus. The males are different in the 
characters of the first metatarsus, which in crudeni is not bent and is rather 
more elongated than that of nigropilosus. 
Acanthodon mossambicus sp. nov. 
The types are two adult males from Magude, Portuguese E. Africa, 
collected by Mr G. van Dam (2. vii. 1915). The characters are as follows: 
Colour. Carapace and appendages pale yellowish brown, abdomen in- 
fuscated. 
Sternum with three pairs of sigilla, the first pair submarginal. 
Chelicera. A single row of teeth, at the base of which on the inner side is one 
large tooth, the basal teeth of the main series being small. 
Pedipalp. The tibia is about twice as long as deep, the excavation bordered 
by stout spines or spinules which however are absent in the middle : the distal 
group includes about 5-8 spines and the proximal group about 8—10. 
Tarsus, viewed from above, presenting a distinct lobe on each side distally. 
Legs. Tibia I very slightly shorter than metatarsus I, swollen but not very 
greatly so : the two tubercles near the apex are large and the distal one bears 
a long black flattened process blunt at the tip: inferiorly, it carries a row of 
four spines on the outer side. 
Metatarsus I almost straight, with one or two strong spines on the outer 
side inferiorly or none at all apart from those at the apex. Tarsus I with no 
distinct spines on the anterior side and with one or none on the posterior side, 
but on each side long spiniform setae occur: inferiorly it is thinly scopulate. 
Tarsi II— IV all scopulate to the base. Band of spinules on anterior side of 
patella IV stretching over about §-§ of the length of the segment and com- 
prising about eighteen spinules. Patella III with about 12-14 spinules on the 
anterior side, including those on the distal edge, but on the dorsal surface 
there are only one or two apart from those at the apex. Coxa III with a patch 
of stiffish setae on the inferior surface posteriorly. 
