South African Araclmida. 195 



segment being blackened all round except at the posterior end, 

 which is pale yellow like the vesicle ; chelicerae and fingers of 

 pedipalps not darkened. 



This form was discovered by Mr. M. Schlechter and described by 

 me as the " Yellow-stinged race " of wahlbergi in Ann. S. A. Mus., 

 V. 1, p. 139. It is only known from the narrow strip of comitry 

 lying between Vuurdood and Naroep '■' in the north of Little Bush- 

 manland, Namaq. Div., immediately south of the Orange (Gariep) 

 Eiver. The Museum has many specimens from Naroep (which may 

 be taken as the types of the variety) and a few from Vuurdood 

 and Hunitsamas, both near Eamonds Drift, and from Zandhoogte 

 between Hunitsamas and Naroep, all of which have been already 

 mentioned in my previous paper. 



y. 0. loaJilhergi var. nigrovesicalis, n., with the vesicle, the whole 

 of the fifth caudal segment, a great part of the fourth and often a 

 few patches at the end of the third, blackened or dark olive-green, as 

 are also the fingers of the chelicerffi. 



This form is identical in colouration with the dried specimen from 

 the Gothenburg Museum mentioned by Thorell, and a very large 

 number of specimens (over 650) has recently been collected by 

 Mr. M. Schlechter and described by me as the " Black- stinged race " 

 of locMbergi in Ann. S. A. Mus., v. 1, p. 139. It appears to occur, 

 generally in abundance, throughout Little and Great Bushmanland 

 (in the N.E. part of Namaq. Div. and the N. part of Kenhart Div. in 

 Cape Colony),! and throughout the whole of this area the same type 

 of colouration is preserved. 



To the numerous locahties given in my former paper (p. 140) may 

 be added (a) Beeststert (near Coboop at the Orange Eiver), and (&) 

 Zwartmodder, both in Kenhart Div. {M. Schlechter). 



The specimens from Naroep may be regarded as the types of this 

 variety, and it is noticeable that at this locality both the varieties 

 occur side by side without showing any transitional forms of colour- 

 ation. It is evident that they do not interbreed. 



Opisthophthalmus longicauda Pure. 

 This species appears to be common in the north of Kenhart Div. 

 in Great Bushmanland, where Mr. M. Schlechter collected the 

 following specimens : — 



* I.e., between long. 18° 15' and 18° 40' E. of Greenwich. 



t This area of distribution extends from about long. 18° (Jackalswater) to about 

 long. 19^0 (Zwartmodder), a distance of over 100 miles. 



