1923] Rathbun, Brachyuran Crabs of West Coast of Mexico 635 



The specimens are of various sizes and have very slender spines 

 on the margins and also in the two dorsal branchial lines, one trans- 

 verse, the other oblique. The slender meropodites of the legs are very- 

 narrow, not at all dilated, although tapering gradually to the distal end 

 and are bristling with sharp spines especially on both margins. 



Length of largest specimen (male) on median line 124.4 mm., width 

 between lower branchial margins (finely spined) 135 mm. 



Libinia setosa Lockington 

 1877, Proc. California Acad. Sci., VII, 1876, p. 68 [6]. 



Santa Maria Bay; with boat dredge; March 18; 1 cf 2 9 13 juv. 

 Without locality label; 4 juv. 



Thoe sulcata Stimpson 

 1860, Ann. Lye. Nat. Hist. N. Y., VII, p. 177. 



San Francisquito Bay; beach; April 9; 1 cf. 



Pitho picteti (Saussure) 

 Othonia picteti Saussure, 1853, Rev. et Mag. de Zool., (2) V, p. 357, PI. xm, fig. 2. 

 Without locality label ; 1 cf . 



Mithrax sinensis Rathbun 

 1892, Proc. U. S. Nat. Mus., XV, p. 266, PI. xxxvm, fig. 2. 

 San Estaban Island ; 1 cf . 



Stenocionops triangulata (Rathbun) 

 Pericera triangulata Rathbun, 1892, Proc. U. S. Nat. Mus., XV, p. 246, PI. xxxn, 

 %. 1. 



Magdalena Bay: Sail Rock, Entrada Point, S. 53° W.; Redondo 

 Point, S. 15° W.; lat. 24° 35' 20" N., long. Ill 59' 35" W.; 13.5 

 fathoms; S. brk. Sh.; March 21; station D5678; 1 9 juv. 



Microphrys triangulatus (Lockington) ' 

 Mithraculus triangulatus Lockington, 1877, Proc. California Acad. Sci., VII, 1876, 

 p. 73 [11]. 



San Josef Island; March 31; 1 cf. 

 Agua Verde Bay; April 2; 1 cf. 

 Without locality label; 1 cf. 



Microphrys branchialis Rathbun 

 1898, Proc. U. S. Nat. Mus., XXI, p. 577, PI. xli, fig. 5. 



Magdalena Bay: Sail Rock, Entrada Point, S. 53° W.; Redondo 

 Point, S. 15° W.; lat. 24° 35' 20" N., long. 111° 59' 35" W.; 13.5 



