390 



MR. R. I. POCOCK ON A 



[Dec. 2, 



These considerations point to the conchision that the African 

 species of Desis made their way into the country by two routes, 

 one lying to the north, the other to the south of the Indian 

 Ocean. 



Desis crosslandi, sp. n. (Text-fig. 78.) 



2 . Colouring like that of the other species of the genus, the 

 mandibles and cephalic region of the carapace deep castaneous ; 

 sternum and mouth-parts a little or considerably paler ; legs pale 

 ochre, with scopular hairs on tarsi and protarsi fuscous ; abdomen 

 testaceovxs. 



Text-fig. 78. 



^ o o 



Desis crosslandi. 



A. P:yes from iiLovc. B. Distal extremity of riglit mandible 

 from below. C. Vulva. 



Carapace about as long as tarsus + protarsus, rather longer than 

 patella + tibia of 4tli leg; a little shorter than patella + tibia of 

 1st and as long as protarsus -f- 1 the tarsus of this appendage. 

 U^es (text-fig. 78, A) of the posterior line slightly procurved, sub- 

 equally spaced, the medians only a little farther apart than either 

 is from the lateral, the medians about 2 diameters apart and 

 perhaps 1 g diameters from the laterals ; anterior median eyes 

 about a diameter apart and about two diameters fi-om the anterior 

 laterals (in other specimens the eyes appear to be larger and the 

 distances between them consequently less). 



Mandibles (text-fig. 78, B) : of the two teeth on the postaxial 

 (posterior or outer) border of the fang-groove the distal is much the 

 larger, the space between the two being equal to about three or 

 four times the length of the proximal, and only a little less than 

 the space between the distal and the base of the fang ; teeth of 

 the preaxial or inner side of the fang-groove normally seven in 

 number, the first, situated opposite the interval between the two 

 teeth of the outer (postaxial) row, smaller than the second, third, 

 or fourth^ which are large and pi'ogressively but only slightly 



