134 Annals of the South African Museum. 



to vary either to a strong granulation or to vanish altogether in local 

 varieties of the same species. 



9. With regard to the granulation on the other parts of the body, 

 it may be remarked that that on the intercarinal spaces of the tail 

 (excepting on the under side of the anterior segments), on the terga, 

 on the legs, and on the surfaces of the humerus and brachium of the 

 palps, is of little or no specific value. (Exception must be made, 

 however, of the posterior surface of the brachium in some species, 

 e.g., the capensis-granifrons group.) 



10. The extent to which the posterior edge of the scape of the 

 pectine is toothless at the base is of specific value, as it does not 

 seem to vary much. The number of pectinal teeth, however, can 

 scarcely be considered of specific importance, being one of the first 

 characters to change in local varieties. 



11. The coloration is, of course, not in itself of specific im- 

 portance, although differences in colour, especially of the legs, 

 often accompany other good characters (e.g., in the fossor-chaperi 

 group). 



12. The structure of the spiracles I found to vary so much, that 

 I now consider them of no value, although at first I was inclined to 

 attach some importance to them (e.g., in fuscipes). 



13. The length of the superior terminal lobe of the tarsi of the legs 

 is not of specific importance, although often useful in conjunction 

 with other characters. In many cases, where a large series of 

 specimens has been examined, the lobe although normally long (or 

 short) occasionally appears short (or long, as the case may be) in a 

 few specimens. 



14. Similarly the number of external spines on the under side and 

 on the terminal lobe of the posterior tarsus, although often useful, is 

 subject to variation in a small percentage of specimens in a large 

 series. 



15. I have examined a large number of specimens in order to 

 ascertain the specific value, if any, of the so-called stridulating organ, 

 recently described by Pocock (Nat. Sci., ix., p. 17, 1896) and com- 

 posed of 1 to 6 or 7 spathulate or obovate lamellae (modified hairs) 

 attached to the inner surface of the basal joint of each mandible. I 

 found this organ completely absent in all our specimens of pallidipes, 

 gigcis, longicauda, schlechteri, and ater, while Pocock found them 

 absent in wahlbergi. In all the type-specimens of peringueyi and 

 crassimanus the organ is also absent. In a specimen from the 

 Cedarberg Eange, however, differing in no other respect from the 

 typical peringueyi, excepting slightly in colour, I found four well- 



