Species of Spiders. 349 



Legs long, those of the fourth pair, measured from base of 

 femur, four times as long as carapace ; tarsi of second, third, 

 and fourth pairs, although rubbed, apparently not scopulate j 

 tibia of second with three pairs of inferior spines, protarsus 

 with two pairs (first legs absent). 



Vulva formed on the same plan as in S. radiatus, but with 

 the two lappets forming the area behind the heart-shaped 

 fovea much longer (fig. 1). 



Measurements in millimetres. — Total length 12; length of 

 carapace 5, of second leg 22, of third and fourth 21. 



hoc. Hadramaut, Arabia. 



A single specimen collected by Dr. Anderson's collector 

 during the expedition of the late Mr. Theodore Bent into the 

 Hadramaut. 



Although resembling S. radiatus and others in the spine- 

 armature of its leg, this new species more nearly approaches 

 the South-African species 8. atomarius and Spenceri in the 

 arrangement of its eyes. These organs, however, differ in 

 relative size and position from those of all the species 

 known to me. 



■if J 



Vulva of (1) «S'. oculatus, (2) S. vigilans, (3) & Kraussii. 

 Selenoj)s vigilans, sp. n. 



Coloured as in S. radiatus, which it closely resembles 

 structurally, with the same spine-armature of the first and 

 second leg — that is to say, with three pairs of spines on the 

 underside of the tibia? and two pairs on the protarsi ; but the 

 posterior median eyes are larger as compared with the ante- 

 rior medians, are much closer to them and form a more 

 strongly recurved line ; the posterior lateral eyes are also 

 larger and more prominent. 



Vulva very different from that of S. radiatus, the lateral 

 lobes being widely separated behind by a prolongation of the 

 median sclerite (fig. 2). 



Measurements in millimetres. — Total length 14 ; length of 

 carapace 6*2, of first leg 20, of fourth leg 21. 



Loc. Giriama, near Fuladoya, Masailand {J. W. Gregory). 



