THE GRAPSOID CRABS OF AMERICA. 383 



Diagnosis. Front very narrow, spatuliform. Movable finger of 

 large claw tapering. Fingers gaping in basal half. Wrist and hand 

 coarsely tuberculate. 



Description. A larger species than U. heterochelos. Carapace 

 narrower, width less than one and four-fifths times length. Upper 

 margin of orbit more sinuous, but less oblique. 



Inner border of arm of large cheliped of adult male strongly den- 

 tate. Outer surface of wrist and hand coarsely tuberculate, much 

 more so than in U. heterochelos. While the surface of the pollex is 

 smooth, except on the margins, the dactylus is more or less tubercu- 

 late on its upper half, the tubercles becoming smaller distally. 

 When the fingers are closed, they gape for only about their basal half. 



The upper margin of the merus, carpus, and two-thirds of the pro- 

 podus of the last leg of the female is furred with hair. 



Measurements. Length of carapace of male (20G89) 25.5, width 

 of same 42.5 mm. Length of carapace of female (20689) 24.2, width 

 of same 38 mm. 



Habitat. Inhabits salt marshes; also found under rocks at low 

 tide. 



Range. From San Bartolome Bay, Lower California, to Peru. 



Material examined. 



Abreojos Point, Lower California; salt marsh; April 18, 1897; 

 A. W. Anthony; 6 males, 3 females (20G89). 



La Paz, Lower California; L. Belding; 1 male, 2 females, 1 y. 

 (1482G). 



San Bias, Tepic, Mexico; June 14, 1897; Nelson and Goldman; 

 Biol. Survey. U. S. Dept. Agriculture; 1 male, 3 females (20G54). 



Corinto, Nicaragua; J. A. McNiel; 12 cotypes (M. C. Z.). 



Punta Arenas (ocean side), Costa Rica; February, 1907; P. Biol- 

 ley; 1 male, y. (39099). 



Santo Domingo, Gulf of Dulce, Costa Rica; April, 1896; H. Pit- 

 tier; 1 male (19440). 



Puerto Grande on the Rio Zarumilla (2 leagues from Capon), 

 Peru; on salt flats; February 2, 1908; R. E. Coker; 1 male, received 

 from Peruvian Government (40468). 



Back of Chulliyache (on Bay of Sechura), Peru; salt marshes; 

 R. E. Coker; 3 males, received from Peruvian Government (40467). 



UCA STYLIFERA (Milne Edwards). 



Plate 134, figs. 1 and 2. 



Gclasiimts plnfnclrict}/1us MILNE EDWARDS, Rejrne Anlm. Cuvier, disciples ed., 



Crust., pi. 18, fig. 1 (not Milne Edwards, 1837). 

 Gclasinnis stt/lifcrns MII.NE EDWARDS, Ann. Scl. Nat., ser. 3, Zool., vol. 18, 



1SH2. p. 145 [109], pi. 3, fig. 3 (type-locality, Guayaquil; type in 



Paris Mus.). 



