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MASTIGOPEOCTUS 



47 



1. Mastigoproctus giganteus. (Tab. X. figg. 1-4, $ <s .) 



Mag 



C. L. Koch, Die Arachn. x. p. 21, 



fig. 768 (1842) 2 j Wood, Journ. Ac. Philad. (2) v. p. 373 (1863) 3 ; Butler, Ann. 8c Ma 



Nat 



Marx. Proc. Ent. Soc. Wash 



5 



Mastigoproctus giganteus, Pocock, Ann. & Mag. Nat. Hist. (6) xiv. p. 130 (1894) 8 ; Kraepelin, 



Abh. Ver. Hamb. xv. p. 37 (1897) 7 ; Das Tierr., 

 yphonus excubitor, Girard, in Marcy's Rep. Red B 



.. 224 (1899) • 

 3 (1853) (<?) 



Thelyphonus rufus, Butler, Ann. & Mag. Nat. Hist. (4) x. p. 205 (1872) ( ? ) 10 . 

 Thelyphonus mexicanus, Butler, loc. cit. p. 201, t. 13. fig. 1 u . 



2 . Colour uniformly blackish or reddish-brown, the ventral surface and the extremities of the appendages 

 paler reddish-brown. Carapace coarsely granular, especially posteriorly ; the cephalic region coarsely 

 rugose. Chelae with coxae rugose, pitted, granular laterally; trochanter denticulate in front, armed 

 below with 2 spines and above with 6 — 3 inner, 2 anterior, and 1 (the largest) on the angle, the 

 external of the two anterior spines small, often nearly obsolete ; femur armed above with 1 shorter and 

 below with 1 longer spine, coarsely granular above, below, and externally, the granules on the outer 

 surface often denticulif orm ; tibia granular above and below and coarsely pitted externally, the apophysis 

 with the anterior edge denticulated throughout its length, the posterior edge with two denticles at the 

 distal end ; hand coarsely pitted and granular, its inner edge and that of the immovable finger denticulate, 

 armed below with two spines ; the opposable edges of the two fingers bluntly denticulated. Femur of first 

 leg sparsely granular, of the remaining pairs coarsely and closely granular, smoother on the inner side, 

 denticulate distally beneath ; a single apical spine on the underside of the tibiae of the second, third, and 

 fourth pairs. Sterna mostly smooth, very finely punctulate and marked with scattered larger punctures, 

 the first, second, and third granular at the side, the first also thickly and finely granular in front. 



J . Smaller than the female ; the two inferior spines on the trochanter of the chela reduced in size ; those on 

 the upperside 5 in number— 2 on the inner side, 1 on the angle, and 2 on the anterior side, the latter close 

 together and remote from the angular spine, which is not produced forwards in advance of them; femur 

 and tibia of chela not externally denticulated ; tibial apophysis thinner than in female, not or scarcely 

 denticulated posteriorly at the distal end ; immovable finger of chela more strongly convex than in female ; 

 the mouth with a distinct apical prominence below the terminal claw. 



Measurements in mm.— $ . Total length (not including flagellum) 74, carapace 25, chela (excluding coxa) 32 ; 

 length of hand 6-5, width 6 ; femur of first leg 16, tibia 21. S . Total length 56, carapace 21, chela 34; 

 length of hand 8*5, width 6 ; femur of first leg 14, tibia 18. 



Hab. Noeth Amekica, San Diego in Texas, Florida.— Mexico (Mas. Paris x ), Mazatlan, 

 Sinaloa, Cordova (Edge), Guadalajara, Jalisco (Schumann), Guanajuato (Luges), Xautipa, 

 Amula, and Omilteme in Guerrero (H. H. Smith), Atoyac, Playa Vicente, Oaxaca 

 (Mus. Brit.). 



Of female and young examples identified comprehensively as M. giganteus I have 



fifteen examples from Mexico 



useum also has others from 



San Diego, Texas (Taylor). 



Three forms of the male of this species are distinguishable : — 



a. The form described above, in which the five spines on the upper edge 



of the trochanter of the chela are subequally developed, the anterior 

 two being separated from each other and not markedly produced 

 anteriorly; the upperside of the trochanter is pitted, but only 

 obsoletely granular, and the outer side of the femur is not denticu- 

 lated, merely rugose. (Tab. X. fig. 2.) giganteus , Luc. (typical form). 



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