300 Mr. R. T. Pocock on some neiv or 



tinted with pale reddish brown ; abdomen greyish black on 

 tergal plates, paler at the sides. 



Head-plate considerably more in width than half the length 

 of the patella of the palp (8:1 2*5), a little less than tibia 

 of fourth leg (8 : 10*5) ; palp longer than third leg, its tarsus 

 and tibia almost equal to its tibia. 



Upper fang of mandible strongly toothed, rather strongly 

 curved at the apex ; the teeth arising some distance behind 

 the tip, the first and second teeth large and subequal, the 

 third minute, fourth only a little larger, the fifth large. 

 Basal membranous part of flagellum not strongly elevated, 

 its border with almost an even semicircular curvature ; flagel- 

 lum bent abruptly backwards from a point on a level with 

 the second tooth, shortish, not reaching the middle of the 

 upperside of the mandible, its distal third with a strong out- 

 ward curvature, the terminal portion straight and armed at its 

 base with two strong serrate teeth, an external and an in- 

 ferior; the apex pointed and barbed somewhat like an arrow- 

 head. Lower jaw of mandible armed with three teeth, two 

 large and one small, the latter attached to the base of the first 

 large tooth. 



? . — Resembling the female of >S'. Darlingii in dentition of 

 mandibles and most structural features, but with the legs 

 distinctly shorter. For example, in S. Darlingii the width 

 of the head is shorter than the patella and only equal to the 

 length of the tibia of the palp (head 11 millim., tibia 12*5), 

 whereas in S. sagittaria the head exceeds the patella and 

 is almost equal to the tibia and tarsus of the palp (head 

 11 millim., patella 10'5, tibia 9). So, too, in the case of 

 the fourth legs, in S. Darlingii the head is less than the 

 length of the patella and tibia (11 : 11*5), whereas in 

 S. sagittaria the head exceeds these segments (11 : 9*5). The 

 head, mandibles, and legs, too, are of a ruddier hue in 

 S. sagittaria, and not clouded with greyish black, as is 

 the case in 8. Darlingii, where, apart from the blackish tint, 

 the jaws and legs are a paler yellow. 



Measurements in millimetres. — ^ . Total length 41 ; 

 width of head 8 ; length of mandible to tip of upper fang 105 ; 

 length of palp 39; patella of palp 12*5; tibia and tarsus 

 12'5; fourth leg 57'5, its patella and tibia 11*2. 



9 . Total length 54 ; width of head 11 ; length of man- 

 dible 15 ; length of palp 37, of fourth leg 50 ^ (for the separate 

 segments see above). 



Loc. Mashonaland : Mazoe [J.ff- Darling). 



* The measurements of the limbs are taken along the external side and 

 icclude the trochanters, but not the coxae, which constitute the sternal 

 area of the cephalothoiax. 



