ale Mr. R. I. Pocock on the 
much thicker and scarcely longer; pectines longer; oper- 
culum divided in both sexes. 
Distribution. Tropical and temperate countries. 
Genera: Prionurus, Hempr. & Ehrenb.; Buthus, Leach ; 
Parabuthus, Pocock (syn. Heterobuthus, Kraep.) ; 
Grosphus, Sim.; Butheolus, Sim. (syn. Orthochirus, 
Karsch) ; Archisometrus, Kraep. ; [sometroides, Keys. ; 
Uroplectes, Pet. (?syn. Lepreus, Thor., and Tityo- 
lepreus, Kraep.) ; Tityobuthus*, gen. nov.; Pseudo- 
buthus, nom. nov.t; Lsometrus, Hempr. & Ehrenb. ; 
Tityus, C. Koch; Centrurus, Hempr. & Ehrenb. ; 
Heteroctenus, Pocock; Ananteris, Thor.; Charmus, 
Karsch ; Heterocharmus, Pocock ; Stenochirus, Karsch. 
In many respects this family, like the preceding, shows 
signs of relationship with the [urini. One of the genera 
even— Charmus—was referred by its author to the latter sub- 
family of the Pandinide. 
A few of the above genera are unknown to me and others 
I have not attempted to locate. 
Timogenes and Thestylus are referred to the Bothriuride on 
the authority of Simon (Ann. Soc. Ent. Ir. 1880, p. 392 &e.). 
Megacormus.—This genus was established by Karsch in 
Arch. Naturgeschichte, 1881, p. 17, for a species named 
granosus by Gervais. It was compared by Karsch to Uro- 
dacus. Possibly it belongs to the Chactini, but nothing is 
known respecting the armature of its feet. 
Belisarius, Sim. (Arach. de France, vol. vii.), referred to 
the Ischnuride, should perhaps constitute a distinct family or 
subfamily. 
Hoplocystis, of which there is a single species, scintilla, was 
characterized by Karsch (Abh. nat. Ver. Bremen, ix. p. 69, 
1884), and was referred by its author to the lurini. I would 
suggest, however, that it may be one of the Buthide. The 
locality is unknown. 
Loctonus of Thorell, from Australia, I have questionably 
united with Urodacus, principally relying upon the locality 
* For Rhoptrurus Baroni, Pocock, from Madagascar, differing from 
LRhoptrurus, 1. e. Pseudobuthus, at least in having a spur on the tibiz of 
the legs of the third pair. 
t For Rhoptrurus, Kaysch, preoceupied by Peters for a snake. 
