560 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



Color. — Dark brown, either uniform or with darker patches on the 

 carapace. Inner side of claws and also the fingers lead-color. Legs 

 light brown tending toward yellowish. (Latreille.) It is probable 

 that this color description was made from preserved specimens, as 

 other authors give brighter colors for the species: Gerstaecker says, 

 body light coral red, fingers black-brown (corallina), while Smith for 

 formosa gives uniform orange, a little darker above than below, fingers, 

 brownish. 



Measurements. — Male (25365), length of carapace 10, fronto- 

 orbital and greatest width of carapace 12, interorbital width 7.9, 

 width of front between antennae 6.2 mm. 



Range. — Cape St. Lucas, Lower California, Mexico, to Panama; 

 Red Sea to Indo-Pacific region. 



American material examined. — 



MEXICO. — California Academy of Sciences; 1925: 



Maria Madre Island: E. part of bay; 5-8 meters; May 17, 1925; 

 F. Contreras; 3 males, 4 females (62710); 4 males, 4 females, returned. 

 Hanna and Jordan; 4-10 fathoms; 1 male, 1 ovigerous female, 

 returned. 



Socorro Island; 1 ovigerous female, returned. 



Clarion Island; shore; 1 male, 1 ovigerous female, returned; 1 

 ovigerous female (62709). 



PANAMA.^Veragua; 1 male, 1 female (Berlin Mus.; Cat. No. 

 2259); types of T. corallina. 



Pearl Islands; F. H. Bradley; 1 female (4834, M.C.Z.); cotype of 



T. formosa. 



Genus QUADRELLA Dana 



Quadrella Dana, Amer. Journ. Sci., ser. 2, vol. 12, 1851, p. 128 (no species men- 

 tioned); Proc. Acad. Nat. Sci. Philadelphia, 1852, p. 84; type, Q. coronata 

 Dana; U. S. Expl. Exped., vol. 13, Crust., part 1, 1852, p. 265. 



Carapace squarely hexagonal, nearly as long as broad, moderately 

 convex, perfectly smooth without trace of regions. Antero-lateral 

 borders straight, sloping slightly outwards and joining the subequal 

 postero-lateral borders at a very wide but distinct angle marked 

 usually by a spine. Fron to-orbital border a little less than greatest 

 width of carapace, interorbital border six spined, front proper cut 

 into four spines, external to which, on either side is seen the spiniform 

 internal angle of the lower edge of the orbit projecting beyond the 

 acute supra-orbital angles. Orbits small, cut out of the antero- 

 lateral angles of the carapace and not concealing eyes. Antennules 

 folding almost transversely. Basal antennal article slender, not 

 nearly reaching front; flagellum slender and long, nearly half the 

 length of carapace. Crests of endostome distinct, expiratory canals 

 closed as in Trapezia. 



Chelipeds somewhat unequal, massive and long, the whole of the 

 long arm projecting beyond the carapace. Legs long and slender, 



