Species of Opisthophthalmus. 139 



OPISTHOPHTHALMUS WAHLBEBGI (Thor.). 



Miaplwnus wahlbergi, Thorell, Ann. Mag. N. H. (4) xvii., p. 13, 

 1876; Atti. Soc. ital, xix., p. 148, 1877, ? . 



Opisthophtlialmus wahlbcrgi, Kraepelin, Eevis. d. Skorp., ii., 

 p. 83, in Jahrb. Hamb. Wiss. Anst., xi., 1, 1894. 



Area of Distribution. German South-West Africa (part '?) and 

 north-western corner of Cape Colony (Little and Great Bushman- 

 land). 



The Museum possesses a very large number of specimens, 

 recently collected by Mr. Max Schlechter in Bushmanland, in the 

 Divisions of Namaqualand and Kenhardt. These belong to two 

 races, readily distinguishable by the coloration of the cauda but not 

 presenting, as far as I can detect, any structural differences. 



A. Yelloiv-stinged Bace. Fourth caudal segment black, lighter 

 above, the fifth segment black, except at the posterior end, which is 

 pale yellow like the vesicle ; mandibles and fingers not darkened ; 

 breadth of hand equalling or only slightly exceeding (by not more 

 than mm.) the length of hand-back in adult ? , but less than 

 the length of hand-back in young females ; No. of pectinal teeth in 



? 16-22, in $ 23-29. Inhabits a narrow strip of country in Little 

 Bushmanland, lying immediately south of the Orange Eiver between 

 Hunitsamas and Naroep. 



(a) 57 $ (30 adult) and 29 $ (6 adult) * from the neighbourhood 

 of Naroep : No. of pectinal teeth in ? 17-22, in $ 24-29 ; length of 

 carapace in ad. ? llf-15 mm., in ad. $ 12-12f mm. 



(&) 15 ? (9 ad.) and 8 $ (2 ad.) from Hunitsamas, seven miles south 

 of Ramond's Drift on the Orange Eiver : No. of pect. teeth in ? 

 16-21, in $ 23-28 ; length of carapace in ad. ? 1U-13| mm., in 

 ad. $ lli-12f mm. 



Mr. Schlechter also found this variety at 



(c) Zandhooghte between Hunitsamas and Naroep, Little Bush- 

 manland. 



(d) Vuurdood, near Eamond's Drift, Namaqualand Division. 



B. Black- sting <ed Eace. Vesicle, whole of fifth caudal segment, 

 the greater part of the fourth, and a few patches at the posterior 

 end of the third segment below, blackened ; fingers of the mandibles 



* These figures throughout this paper represent the number of specimens 

 which I have individually examined with regard to the pectinal teeth, length of 

 carapace, armature of tarsi, &c. The figures given for the pectinal teeth, there- 

 fore, represent the actual limits, between which their number varies in a given 

 set of specimens. Similarly the figures given for the lengths of the carapace 

 represent the least and greatest length in each set. 



