46 Mr. R. I. Pocock on 
width 9:2, height 6; length of movable dactylus 9:5, of 
immovable (along free border) 5. 
A single male specimen from the Murchison Range in the 
Transvaal, collected and presented to the British Museum by 
Mr. C. R. Jones, with whose name I have very great pleasure 
in associating this remarkable new form. 
HETEROCHARMUS, gen. nov. 
(PI. 111. B. figs. 2, 2@, 20.) 
? Charmus, Karsch, Mitth. Munch. Ent. Ver. 1878, pp. 101, 104, 105. 
Cephalothorax without keels; the ocular tubercle in the 
anterior half; the frontal region horizontal, not sloped down- 
wards from the tubercle to the anterior margin ; three lateral 
eyes. 
Tergites with a single median keel. 
Sternum small, pentagonal, wider than long, about equal in 
length to the genital operculum. 
Pectines normal. 
Stigmata elongate. 
Chelicere with movable dactylus bifid at the apex, the two 
fangs equal in length, with three teeth on the upper edge and 
two on the under ; immovable dactylus with two teeth above 
(the posterior bifid) and two subequal teeth below. 
Chele with the external series of teeth formed by the 
enlargement of the three posterior teeth of the median rows, 
the internal series formed by single enlarged teeth, separated 
from the apices of the median rows and constituting with the 
teeth of the external series short oblique rows. 
Tail somewhat powerful; no spine beneath the aculeus. 
Legs of third and fourth pairs with tibial spur. 
Claws free. 
In its broad pentagonal sternum this genus departs widely 
from what is normal in the Buthide, and its inclusion in this 
family will necessitate the abandonment of the definition 
‘‘ sternum subtriangulum.’”? Nevertheless I think it should 
be referred to this group, for in the sum of its characters it 
is unmistakably Buthoid. 
In the dentition of the cheliceree, the form of the palpi, 
with their slender unkeeled hands and long dactyli, the 
arrangement of the denticles on these dactyli, the spurs on the 
tibiz of the posterior legs, the keeling of the trunk, &c., it 
agrees closely with many genera of this family. It only 
