Arachnida from Natal. 203 



This species and S. gregarius may be readily distinguished 

 as follows : — 



a. Total length of $ about 8 mm. ; ocular quad- 



rangle much narrowed in front; anterior 

 median eyes very much smaller than poste- 

 rior medians ; femora and tibiae of first legs 

 and in a lesser degree of the second black, 

 especially within ; tarsi and protarsi of these 

 legs not banded ; tibia of first leg in (^ fur- 

 nished with thick fringe of long hair gregarius, 0. P. Caiu'ir. 



b. Total length of 5 11 mm. ; ocular quadrangle 



much less narrowed in front ; anterior 

 medians much larger as compared with pos- 

 terior medians ; femora, tibiae, and protarsi 

 of legs distinctly banded ; tibia of first leg 

 in (S like that of 5 , not plumose dumicola, sp. n. 



Genus Dresserus, Simon. 



Dresserus obscunis, sp. n. (PI. VIII. fig. 8.) 



Colour. Carapace and posterior legs reddish brown, ante- 

 rior legs and mandibles blacker ; abdomen mouse-brown ; 

 the whole body covered with greyish-black hairs. 



Carapace high in front, nearly vertically elevated just in 

 front of the fovea, its length about equal to that of tibia, pro- 

 tarsus, and tarsus of first leg ; width of head as long as 

 patella, tibia, and protarsus of third leg, scarcely as long as 

 patella and tibia of fourth leg or as tibia and protarsus of 

 first, longer than protarsus and tarsus of first by about one 

 third the length of the tarsus, also about equal to tibia and 

 protarsus of fourth ; space between posterior median eyes 

 about equal to twice their diameter, space between posterior 

 medians and anterior laterals about four times the diameter of 

 the former. 



Legs of first pair a little longer than those of fourth, patella 

 and tibia of fourth longer than of first, tarsus and protarsus 

 of first about equal to patella and tibia of first. 



Measurements in millimetres. — Total length 15 ; length of 

 carapace 7 ; width of head 5 ; length of first leg 18*5, of 

 fourth 12'8 ; patella and tibia of first 5, of fourth 5'5. 



Loc. Estcourt, 4000 feet {G. A. K. Marshall). 



The only known species of this genus up to the present 

 time is D. fuscus, Simon (Bull. Soc. Ent. France, 1876, 

 p. Ixxxvii), from Zanzibar. This species, based upon an 

 immature female, is too briefly described to make any com- 

 parison between it and D. ohscurus possible. The difference 

 of locality, however, is, apart from other considerations, suffi- 

 cient justification for describing the Natal form as new. 



