380 PROF. E. R. LANKESTER ON CERTAIN POINTS IN THE 
Genus 2. TELEGONUS. 
Sternum compressed antero-posteriorly, and thus more or less completely divided into 
laterally expanding narrow lobes or bands. 
Subgenera q (Pl. LX XXII. figs. 4, 5.) 
Subfamily II. ANDROCTONINI. 
Sternum (metasternite) triangular. 
Nerves to the regions of both the first and second pair of lung-books descending from 
the prosomatic ganglion-mass. The first detached ganglion of the mesosoma lies in its 
fourth segment, and supplies nerves to the following segment. 
Ornament of the lamellie of the lung-books reticulate as well as punctiform. 
A double row of teeth to either both rami of the chelicere or to the movable ramus 
only. 
Genus unicum. ANDROCTONUS. 
Char. of the subfamily. 
Subgenus PrionvRUvs. 
Char. Two rows of teeth to each ramus of the chelicere; tail very thick; hand 
rather slender (compared with Scorpio). 
Types: Prionurus funestus, Ehr.: North Africa. (Pl. LX XXII. fig. 2.) 
Prionurus occitanus ; the yellow Spanish Scorpion. 
Subgenus CENTRURUS. 
Char. Two rows of teeth to the movable ramus only of the chelicera ; a single tooth 
of a second row present in the fixed ramus sometimes; tail very long and slender, some- 
times with a spine below the sting; hand very slender. 
Types: Centrurus americanus, De Geer. (Pl. LX XXII. figs. 6, 13, 17.) 
Centrurus hottentotus: South Africa. (Pl. LX XXII. figs. 7, 11, 18.) 
The facts of geographical distribution, so far as they are known, give some import- 
ance to the divisions thus recognized. The Scorpions of the Palearctic and Indian 
regions are essentially those of the genus Scorpio. In the Ethiopian region we have 
both the genera Scorpio and Androctonus, the latter making its way into Spain, and to 
some extent into the Indian region. 
In America we have both Scorpio and Androctonus. 
The species of the genus Telegonus appear to be confined to South America and 
Tasmania. 
I confess to not being at present in a position to offer an opinion upon the questions 
of species and subgenera in yery many cases. It is necessary thatall the described forms 
