Species of Tropical African Solifuge. 253 
dorsalis was without a name until I applied Paracleobdis to it 
in 1895. 
Like most of the other genera of Solpugine, Paracleobis is 
not typically an. African form, its species being found in 
the countries bordering the Mediterranean basin. A few 
species, however, have been described from Somaliland and 
Socotra. 
Genus Biron, Karsch. 
Arch. Naturg. 1880, p. 234. 
The two genera, Desia (type precor, C. Koch, from 
Mexico) and Biton (type Ehrenberg?, Karsch, from Arabia), 
established by Karsch, are, according to their diagnoses, in- 
distinguishable, as Simon has pointed out (Ann. Mus. Genov. 
xvii. p. 253, 1883). If this be the case in reality, the name 
Desia has the priority ; but until the type of Des¢a has been 
thoroughly re-examined it appears to me to be wiser, for 
geographical reasons, to look upon the two genera as distinct. 
Though included in the above table of genera, the genus 
Biton does not, properly speaking, belong to the African— 
that is to say, the Ethiopian—tauna, being merely an alien 
from the Mediterranean district of the Palearctic. The 
known species have been recorded from Tunis, Egypt, 
Arabia, Somaliland, &e. 
Genus CeRoMA, Karsch. 
JB. Hamburg. Anst. ii. p. 137, figs. 8, 9 (1885). 
Ceroma Johnstonit, sp.n. (Figg. 1-1 a.) 
3 —Colour a tolerably uniform fusco-testaceous or greyish- 
brown tint, not distinctly banded as in C. ornatum; mandibles, 
head-plate, and palpi, with the exception of the base of the 
femur, palely infuscate; femur, tibia, and distal end of pro- 
tarsus of legs also more or less infuscate; the terga showing 
an indistinct fuscous patch on each side. 
Head-plate moderately convex, dilated at the angles, with 
very faint divisional line, furnished with short iridescent 
hairs and longer fine sete ; tubercle large, bearing fine sctx, 
especially in front. 
Mandible rather strongly convex above and armed with 
many long bristles, spinitorm and slender; upper jaw with a 
slight sigmoid flexure, the upper edge concave at the base, 
convex distally, armed below with two large subequal teeth, 
affixed some distance behind the tip, and followed by an outer 
and an inner series of four teeth, the first of the inner series 
