Si/steniatt'cs of the Ptdipalin. 163 



cliela (along uppersitic) 17'5, of tibia 20, of hand 8; femui of 

 first leg 5-1, of fourth leg 28. 



Loc. Pambelar in Ecuador. 



One male and two female examples. The length of the 

 chelaj is substantially the same in the two sexes. 



In the spine-armature and form of the chelai this species 

 stands midway between the previously known species of this 

 genus and the following species, which would otherwise have 

 strong claims to rank as a distinct genus. 



Heterophrynus alces, sp. n. 



? (adult). — A uniform reddish-brown colour. 

 Carapace finely and closely granular, studded with coarse 

 granules as well ; the anterior border straight, denticulated : 

 ocular tubercle with a pair of granules above, about its own 

 diameter from the frontal border ; lateral clusters not widely 

 separated, the distance between them equal to about one 

 third the greatest width of the carapace, considerably nearer 

 to the middle line than to the anterior or lateral border. 



C/ieliC short ; tibia only a little longer than the median 

 length of the caraj»ace, much less than its width ; trochanter 

 armed with four spines, femur with five above and five below 

 on the margin, as in H. armiger ; the second on the upperside 

 erect, the fourth on the underside much longer t!ian the third 

 or fifth, which are subequal, the first inferior about equal to 

 the height of the segment, the longest of the upper spines 

 much less ; base of femur furnished with a strong additional 

 spine above the two long inferior spines, exactly as in the 

 genus Acanthophrynus ; tibia armed above with six spines, 

 below with five, the longest upper spine only a little ex- 

 ceeding the height of the segment and considerably more 

 than one third of its length ; the first, fifth, and sixth not 

 very unequal in length, the first a little the smallest, third as 

 long as the second or fourth ; hand with two upper and two 

 under spines, the latter subequal ; chela3 coarsely and finely 

 granular, except the hand, which has only a few granules 

 externally and beneath in its basal half. 



Measurements in millimetres. — Total length 22 ; width of 

 carapace 12, median length 7'5 ; length of tibia of chela 9, 

 width 3*5; of femur of first leg 22, of fourth leg 15. 



Loc. Upper Surinam lliver (C IV. Ellacomhe). 



Difi'ering from the remaining species of Heterophrynus in 

 the presence of a strong spine upon the base of the femur of 

 the chela in front above tlie long proximal inferior spine, as 

 in Acanthophrynus J and in the form of the chelie, which are 



