Opistlioplitlialiims in the British Masewn. 237 



tvast in colour between the legs (and hands) and the trunk, 

 the tint of the interocular area of the carapace resembles that 

 of the trunk. In almost every other case it is the same ])ale 

 colour as the hands and legs. 



This specimen gives the following measurements in 

 millimetres : — Total length 98 ; length of tail 53, of carapace 

 14"5 ; distance of eyes from front border 8'6. There are 23 

 pectinal teeth on each side, and the sterna of the abdomen 

 are strongly corrugated with deep transverse grooves, which 

 are much more strongly marked than in the specimen from 

 Otjimbinque. 



Another interesting point about this species is that in the 

 subcentral position of its median eyes and the deepness of the 

 notch in the anterior border of the carapace it approaches the 

 genus Scorpio — the so-called Black or Rock Scorpion, which 

 ranges in Africa from Senegambia to the Congo on the west, 

 and from Abyssinia and Somaliland to Lake Nyasa (Zomba) 

 on the east, but is replaced in S. Africa by pisthophlhaliniis . 

 On account of these features this species was by Karscli 

 regarded as a distinct genus, which he named Petrooica^ (a 

 preoccupied name, which was changed by myself into (Eco- 

 jjetrus). But since the exact position of the eyes is a cha- 

 racter liable to considerable sjjecilic variation, it is, perhaps, 

 better to hold with Kraepelin that carinaius is merely a well- 

 marked species of Opisthophthahnas. 



Opisthophtlialiiius Wahlbergi (Thor.). 



Micephoiius W(ihU)cr(ji, Tliorell, op. cit. p. 222. 



One female example in Keyserling's collection from Otjim- 

 binque, about 100 miles up the river inland from Waltisch Bay, 

 in Damaraland, gives the following measurements in milli- 

 metres : — Total length 103 ; length of tail 46, of carapace 14; 

 distance of eyes from posterior border 6 ; length of liand- 

 back 6, of movable digit 13 ; width of hand 9*6. Pectinal 

 teeth 17. 



Opisthophthalnius austerus, Karscli. 

 (L>1. X. fig. 4.) 



Opisthophthalnms austerus, Karscli, Mitth. Miiucli. eut. Ver. 1879 ; 

 Kraepelin, loc. cif. p. 94. 



Two male examples ticketed " S. Africa, near the Tropic of 

 Capricorn" (Methuen's Expedition}. Recorded by Kraepelin 

 from Cape Colony and Griqualand. 



