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48 





" 



PEDIPALPI. 





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This is the form that Girard characterizes from the Red River 

 under the name Thelyphonus excubitor, and it is probably the typical 



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M. 



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of it ticketed 



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£C 



b 



Mexico n (Keyserling 





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an 





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of the chela coarsely granular, and the femur of the chela studded 



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externally with sharp denticuliform granules or tubercles ; the two 



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anterior spines on the upper edge of the trochanter are united 

 basally, the external (which is the smaller) rising from the internal, 



* 



which is much stronger than the rest of the spines on this segment. 



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(Tab. X. fig. 4.) . . . . . . . 



The British Museum has two males o 

 type, from Oaxaca ; the other labelled " 



Subsp. scabrosus, n. 





















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one, the 





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c. A small form with the two anterior spines on the upperside of the 



trochanter of the chela almost obsolete, the two internal small, the 

 angular alone being prominent but small ; the external surface of 

 the femur and of the base of the tibia of the chela are coarsely 

 denticulated. (Tab. X. fij 

 The British Museum 









: 



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- 





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• *J • J » • • • • • • 4, '"-' • • • • • 



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has two males of this subspecies — the 



Subsp. mexicanus, Butl. 



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type, which is merely ticketed "Mexico/' and another from 

 "Ciudad" (Rogers). In the bottle with the last there is a small 

 female which has the chela externally more scabrous and subdenti- 

 culate than the female I refer to M. mexicanus. 



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2. Mastigoproctus liochirus. (Tab. X. fig. 5.) 



Mastigoproctus liochirus, Pocock, Ann. & Mag. Nat. Hist. (7) i 



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. 



(1900) 



I 



i . 

 9 



Colour : carapace and abdomen blackish, chelse and legs reddish-brown. Carapace and terga less coarsely 



M. giganteus. Chela with coxa almost smooth ; trochanter armed as in the female ; spine 

 on upper edge of femur minute, on the lower side small ; tibial apophysis long, as in the male of 

 M. qiaanteus, smooth alone its nosterior fido-p. Knf. with 1 snVia™'n Q i ,i Q n+;j a o«^ i «i^„^ +^ n- n -k„™ — .u,~ 



tibia, anterior edge of the apophysis denticulated ; inner edge of hand denticulated from the base up to 

 the tip of the immovable finger, 1 spine on the lower side of the hand close to the base of the movable 



finger, which has denticulated edges and no process beneath the terminal fang ; the whole of the upper 

 and outer sides of the segments of the chela smooth, polished, sparsely punctured and quite unlike the 

 appendages in M. giganteus ; hand as wide as long, its inner edge compressed as in the female of 

 M. giganteus. Sterna smooth and polished, without granules. Legs without an apical tibial spine upon 

 the second and third pairs. 



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Measurements 



Total length 36, carapace 13, chela 28-5. 



. 



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Hab. Guatemala (Sarg). 



This species is based upon a single specimen, which, to judge by the length of the 



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chela, is probably a subadult m 



The genital operculum (sternum of first abdominal 



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segment) is unmodified, but is furnished on its' underside near the edge with a pair of 

 horny black crests, such as are seen in subadult specimens. The second abdominal 

 sternum is also unmodified. 



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