Tarantulidas in the British Museum. 281 



than the width of the carapace, a little shorter than that of 

 the third and considerably exceeding that of the fourth ; tibiae 

 of second, third, and fourth about equal to the femora ; first 

 and second tibials of the fourth nearly two thirds the length 

 of the first tibial, but distinctly shorter than the protarsal, the 

 second tibial about half the length of the third and barely 

 equal to half the distance between the eyes. 



Measurements in millimetres. — Total length 23 ; carapace, 

 width 12 8, median length 7*8, distance between the eyes 3'5. 

 Chela : length of femur 6'S, height 3, length of longest spine 

 2 ; tibia, length 9*5, thickness 3'5, length of longest spine 

 2*5 ; tarsus 4 - 3, digit 4. Legs : femur of first 19, of second 

 15, of third 15*5, of fourth 13; tibia of second 13*8, of third 

 15-2, of fourth 14. 



Loc. Mexico (Tuxtla and Oaxaca). 



I have seen four examples of this species from Tuxtla — 

 the type, which is the largest, and three others — and one 

 from Oaxaca, and one ticketed merely Mexico. 



The example from Oaxaca presents the curious anomaly, 

 which may perhaps be termed atavistic, of having the poste- 

 rior tibia on one side undivided and on the other divided into 

 only two segments, as in the type of santarensis. In other 

 characters, however, this example agrees with the type. 



Tarantula macrops, sp. n. (PL VII. figs. 3, 3 a.) 



Colour of carapace and chela? nearly black, the marginal 

 spots on the former indistinct ; the principal terga adorned on 

 each side with a reddish-yellow patch, which embraces the 

 muscular impression and spreads outwards and backwards 

 towards the posterior angle. Spots on the femora visible 

 but indistinct. 



Granulation of the upper surface of the trunk not coarse 

 and somewhat sparse. 



Carapace with frontal region convex anteriorly; area in 

 front of the lateral eyes nearly vertical ; distance between the 

 eyes less than the median length of the carapace and twice 

 ad great as the distance between the eyes and the anterior or 

 lateral border ; median tubercle very high, shining, with 

 vertical sides, wider than long, separated from the anterior 

 border by a space which is distinctly less than its longitu- 

 dinal diameter ; anterior border straight from side to side 

 very weakly denticulate, only very slightly overlapping the 

 median frontal process, the apex of which, being slightly 

 turned forwards, is just visible from above. 



Mandibles very slightly granular, with two terminal 

 tubercles a little enlarged. 



