Species of Tropical African Solifugie. 253 



dorsalis was witliout a name until 1 applied Paracleohis to it 

 in 1895. 



Like most of the other genera of Solpuginte, Paracleohis is 

 not typically an African form, its species being found in 

 the countries bordering the Mediterranean basin. A iitw 

 species, however, have been described from Somaliland and 

 ISocotra. 



Genus Biton, Karsch. 

 Arch. Nnturg. 1880, p. 234. 



The two genera, Dcnsia (type prcecox^ C. Koch, from 

 Mexico) and Biton (type Ehrenhergi^ Karsch, from Arabia), 

 established by Karsch, are, according to their diagnoses, in- 

 distinguishable, as Simon has pointed out (Ann. Mus. Genov. 

 xviii. p. 253, 188'>). If tliis be the case in reality, the name 

 Dcesia has the priority; but until the ty[)eof Dcesia 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 — fauna, being merely an alien 

 from the Mediterranean district of the Palgearctic. Tiie 

 known species have been recorded from Tunis, Egypt, 

 Arabia, Somaliland, &c. 



Genus Ceroma, Karscli. 

 JB. Hamburg. Anst. ii. p. 137, figs. 8, 9 (1835). 



Ceroma Johnstonii, sp. n. (Figg. 1-1 a.) 



(J . — Colour a tolerably uniform fusco-testaceous or greyish- 

 brown tint, not distinctly banded as in G. ornatum ; mandibles, 

 head-plate, and palpi, with the exception of the base of the 

 femur, palely infuscate ; femur, tibia, and distal end of ])ro- 

 tarsus of legs also more or less infuscate; the terga showing 

 an indistinct fuscous patch on each side. 



Head-p)late moderately convex, dilated at the angles, with 

 very faint divisional line, furnished with short iridescent 

 hairs and longer fine setae ; tubercle large, bearing fine sutse^ 

 especially in front. 



Mandible rather strongly convex above and armed witli 

 many long bristles, spiniform 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 



