Four new Arachnida. 221 



proximal to the distal end of the segment, but owing to tlie 

 shortness of the femur the distal spine lies near its distal end, 

 not close to its middle as in II. cervinus ; the length of the 

 proximal spine, the longest of the series, is equal to half the 

 length of the upperside of tiie femur ; tibia armed with six 

 spines above and five below, as in II. cervinus, H. alces, and 

 H. armiger, and, as in armiger and alces, the two distal 

 spines on the upperside are shortish, slender, and subequal 

 in thickness and strength (in cervinus the ultimate is much 

 stronger than the penultimate) ; on the underside the second 

 and third spines from the distal end are much the longest of 

 the series and equal ; in H. cervinus the second spine from the 

 distal end is shorter and thinner than the ultimate and 

 much shorter than the third or antepenultimate. In alces 

 and armiger the row of spines is practically the same as 

 in H. elaphus^ except for the presence of an additional spina 

 between those that are the third from the proximal and 

 the second from the distal end ; the first long spine on the 

 upperside of the tibia is about its own length from the 

 proximal end; the tibia weakly bowed, about four times 

 as long as high, and rather less than twice the length 

 of the hand. Ilavd spined as in //. armiger^ the inferior 

 proximal spine smaller than in //. cervinus ; much smoother 

 than in the latter. 



Measurements in millimetres. — Total length 32; width of 

 carapace 15, its median length 10-5; length of upperside of 

 femur of chela 11, of tibia 15, femur of second leg 32. 



Loc. Marcapata Valley, E. Peru. 



In the spine-armature of the chelse this species is inter- 

 mediate between H. cervinus and H. armiger. The chelse, 

 however, are much shorter and less coarsely granular than in 

 either of these species. 



The only other species of this genus previously recorded 

 from Peru is H. gorgo of Wood (Tr. Am. Phil. Soc. xiii. 

 p. 440, pi. xxiv. fig. 1, 18G9). This species is unknown to 

 me, but judging from tlie figure and description, neither of 

 which is good, it has the chelee more granular and much longer, 

 the femur exceeding the width of the carapace by one fourth 

 of its length, the tibia exceeding it by one third of its 

 length. The spines, moreover, are much shorter; on the 

 lower side of the femur there are five, of which the third 

 from the proximal end is longer than the second; there are 

 seven spines on the upperside of the tibia, two preceding the 

 first long spine. Width of carapace 16 millim.; length of 

 femur of chela 22, of tibia 25. 



All these characteristics point to close I'elationship between 

 Ann, & Mag. N. Hist. Scr. 7. Vol. xi. 16 



