1902.] NEW HARVEST-SPIDERS, 409 



spinous above ; trochanters not spiny ; femur of 1st with some 

 weak inferior spines, of the rest not spiny. Tarsus of 1st with 5, 

 of 2nd with 12, of 3rd and 4th with 4 segments. 



5 (?). With three small tubercular spines on each side of the 

 head-shield in front. Palpi a little larger, no spine on the dorsal 

 side of the trochanter ; femur with three strong dorsal spines, 

 the distal one represented in the other sex obsolete, and one strong 

 median internal spine. Distal end of protarsus of 1st leg 

 incrassate, with the inferior distal half of the thickened area 

 strongly emarginate. 



Size about the same as that of A. rostrata. 



Log. Madagascar; Ambohimitombo {C. I. Forsyth Major). 



The specimen I have described as the male of this species is 

 probably not quite adult. It is smaller than the other, and in 

 the spine-armature of the palpi much more neai'ly resembles both 

 sexes of A. rostrata. The other specimen I regard as the adult 

 female, on account of the peculiar modification of the extremity 

 of the protarsvisof the 1st leg (text-fig. 83, A^), which also obtains 

 in the specimen considei-ed to be the female of A. rostrata. 



The following is a key to the known species of Acumontia : — 



JIales. 



a. Free abdominal termites furnished with a few very long spines rostrata. 



b. Free abdominal tergites furnishetl with tubercles or short tuberculi- 



form spines. 



«!. Antero-lateral tubercles on the carapace verj' small, the posterior 

 pair of spines on the dorsal scute close together, contiguous 

 basally ' major i. 



fti. Antero-lateral tubercles large ; posterior dorsal spines shorter and 



widely separated basally armata. 



Females. 



a. Two pairs of long subequal spines on posterior portion of dorsal 



scute; antero-lateral spines absent rostrata. 



h. Posterior two pairs of spines unequal, the anterior short. 



«i. Posterior spines basally contiguous majori. 



h^. Posterior spines basally widely separated armata. 



Genus Sorensexella, nov. 



Distinguishable from Tricenonyx, &c. by the situation of the 

 ocular tubercle in the centre of the cephalic scute and behind its 

 anterior margin. Lateral branches of claws of 3rd (probably also 

 of 4th) leg considerably longer than the median branch — hence 

 the tarsus appears to be three-claioed. 



Type, S. preJiensor. 



Sorensenella prehensor, sp. n. (Text-fig. 84, A, p. 410.) 



Colour uniformly brownish. 



Dorsal surface (text- fig. 84, A) tolerably smooth ; anterior 

 border of cephalic scute mesially tridentate ; three lateral spines 

 on each side, the inner the largest, the posterior lying far back 



