130 Descriptive Catalogue of the Coleojjtera of South Africa. 



to the fifth joints inclusive are only twice as long as broad, the sixth is 

 hardly longer than broad, the seventh is quadrate, and the eighth 

 transverse. In R. rivularis the joints three to five are three times as 

 long as broad, the sixth twice as long as broad, and the seventh a little 

 longer than broad ; the abdominal striae are as in R. Peringueyi, and 

 not so distant as in R. diversa ; the prothorax is less narrowed behind 

 than in both these species. In comparison with the male of R. Peringueyi, 

 it is of larger size, the metasternum is noticeable on account of the 

 basal blunt tubercle, the fovea of the last ventral segment is larger, 

 and the apical spur of the intermediate tibiae is not so robust. It 

 cannot be compared to the male of R. diversa, the last antennal joint 

 of which is provided with an inward tooth, entirely absent in 

 R. rivularis. 



Hob. Cape Colony (Stellenbosch). One example, captured at the 

 foot of grass growing on the banks of the river. 



[The above additions to the family Pselaphida were too late to be 

 included in the Index, pp. 123, 124.] 



