630 Mr. E. C. Wiougliton on the 



a reliable character on wliich to base a differentiation of 

 forms, which agrees very fairly with tlieir geographical 

 distribution, and have thus been able to distinguish four 

 groups with bullae whose antero-posterior lengths are 

 respectively 6*5, 6, 5*5, and 5 mm. 



Group I. covers the country, roughly speaking, south of 

 25° S. lat. and west of 25° E. long. 



Group TI. runs along the coast from the Cape to Zululand, 

 but a form of this group crops up in Angola. Tiie area 

 directly north of Group I. is unrepresented in the collection 

 except by a single specimen from Matopo, but this specimen 

 falls also into Group II. 



Group. III. occupies the whole of the country north of 

 25° S. lat. and east of 25° E. long, except in two small 

 isolated patches. 



Group IV., so far, is represented by specimens from two 

 isolated areas, viz. : — 



1. Basutoland, and a small area adjoining^ along the crest 

 of the Drakensberg. 



2. The Mlangi Plateau, Nyasaland. 



The specimens from both these localities are labelled 

 " 6000' Alt.,"'' and possibly even this altitude is a compara- 

 tively lower level surrounded by still greater heights ; it 

 certainly is so in the case of the Basutoland specimens. In 

 any case, however, this group is evidently a higii-level form. 



Each of these groups contains, as will be seen, more than 

 one form, and I have found it very difficult to decide as to 

 the systematic status which should be given to these forms. 

 I think that each of these four groups should probably rank 

 as a species ; but if pumilio is once broken up consistency 

 would require that other species besides these should be formed 

 (e. g. pumilio and vittatus, both taken at Cape Town, &c.). 

 I have come to the conclusion that, in view of the absolute 

 identity of pattern, the variability of coloration, and the 

 difficulty of deciding the inter-relationship of the different 

 forms, the simpler and safer way is to call them all subspecies 

 of the original species pumilio. 



The following is a key to the various forms I have been 

 able to differentiate: — 



A. Antero-posterior length of bullae 6'o mm. 



a. Hind foot 27 mm. or more bechuayicB, Thos. 



b. Hind foot less than 27 mm. 

 a}. Length of tooth-row 5 mm. 



tt^. Hind foot 25 mm. or more . cmereM.«,Tho3.&Schw. 



6^. Hind foot at most 25 mm meridionalis, subsp. n. 



6\ Length of tooth-row 4*6 mm., rjriqncp, sub^p. u. 



