Tarantulidee in the British Museum. 285 



The lateral eyes are a little further apart. 



The lower surface of the femur and tibia of the chela are 

 smoother below than in pulchripes, and the third spine on the 

 upperside of the tarsus more nearly approaches the second in 

 length ; moreover, the second long spine on the upperside of 

 the femur is longer than the first, and not noticeably shorter 

 than it as it is in pulchripes. 



Measurements in millimetres, — Total length 20 ; median 

 length of carapace 7, width 12, distance between eyes 4. 

 Chela : length of femur 4*5, of tibia 7*5 ; tarsus 3*8, digit 3*4. 

 Legs : femur of first 16, of second 12'5, of third 13'5, of 

 fourth 10*5 ; tibia of second 10*5, of third 12, of fourth 10'5. 



Loc. Santarem, Brazil (Wickham Coll.). 



The type and only known example of this species is a 

 female. Curiously enough it presents a remarkable abnor- 

 mality in the development of its posterior tibia?, that on the 

 right side being undivided and that on the left divided into 

 only two segments. 



Tarantula Gervaisii, sp. n. (PI. VII. figs. 5, da.) 



Colour as in T. pulchripes, but with the spots upon the 

 legs and trunk much less clearly defined. 



Resembling T. pulchripes in size and general appearance, 

 but apparently differing in the following features : — The 

 anterior border of the carapace is wider, straighter, and more 

 finely and less closely denticulate ; the lateral eyes are equi- 

 distant from the anterior and lateral edge on each side, and 

 the distance is distinctly less than half the space between the 

 eyes, which is noticeably greater than half the median length 

 of the carapace, and almost equal to the length of the upper- 

 side of the femur of the chela. 



Mandibles smooth above, with no enlarged terminal 

 tubercle. 



Chelo3 in shape and spine-armature resembling those of 

 T. pulchripes, but the first and third spinules on the lower side 

 of the tarsus are short, the fourth on the upperside is not 

 noticeably elongate, and there is no spinule below the eighth 

 on the upper edge of the tibia. 



Legs shorter than in the type of T. pulchripes, but approxi- 

 mately the same length as those of the female of that species ; 

 the femur of the first longer than the width of the carapace by 

 about one quarter of its length, that of the second about equal 

 to that of the third, a little greater than, and that of the fourth 

 a little less than, the width of the carapace ; tibiae of the same 

 comparative length as in T. pulchripes, the second tibial of the 

 Ann. & Mag. N. Hist. Ser. 6. Vol. xiv. 20 



