THE SPIDER CRABS OF AMERICA 361 



Range.— West coast of Mexico and Central America. 



Material examined. — 



Magdalena Bay, Lower California: C. R. Orcutt; 1 male, 1 female 

 (50642) ; 1 male/2 females (50654). August 14, 1872; U. S. C. S. S. 

 Hassler; 1 male (Cat. No. 2098, M. C. Z.). 



Off San Francisco (Gulf of California?); 3 males, 1 female (Brit. 

 Mus.). 



Northern part, Gulf of California: lat. 29'' 30' N.; long. 112° 40' 

 W.; 45 fathoms; 1880-1882; Lieut. Comdr. H. E. Nichols, U. S. 

 Navy; 1 young female (15822), holotype of Othonia nicJiolsi. 



San Jose Island, Gulf of California; 1921; California Academy of 

 Sciences Expedition; 1 male (Cal. Acad.). 



Southern part. Gulf of California; lat. 24° 11' 30" N.; long. 109° 

 55' 00" W.; 10 fathoms; Sh.; April 30, 1888; station 2828, Albatross; 

 1 male (21962). 



Lower California; M. Diguet; 1 immature female (Paris Mus.). 

 1911; Albatross; 1 male (55751). 



Realejo, Nicaragua; Oersted, collector; 1 male (19695); received 

 from Copenhagen Mus.; 1 male, 1 female (Copenhagen Mus.). 



PITHO QUINQUEDENTATA Bell 



Plate 250, figs. 1-4 



Pitho quinquedeniata Bell, Proc. Zool. Soc. London, vol. 3, 1835 (1836), 

 p. 172 (type-locality, Galapagos Islands, sandy mud, 6 fathoms; type 

 not extant). — Rathbun, Proc. U. S. Nat. Mus., vol. 38, 1910, p. 573 (part). 



Othonia quinque-deniata Bell, Trans. Zool. Soc. London, vol. 2, 1836, p. 57, 

 pi. 12, fig. 2. 



Othonia mirabilis Gerstaecker, Arch. f. Naturg., vol. 22, pt. 1, 1856, p. 113 

 (part). 



Othonia quinquedentata A. Milne Edwards, Crust. Reg. Me.x., 1875, p. 118, 

 pi. 24, figs. 3-3c. 



f Othonia aculeata? Gang, Boll. Soc. Nat. Napoli, ser. 1, vol. 3, 1889, p. 181, 

 pi. 7, fig. 6. 



Diagnosis. — -First movable segment of antenna narrow. Manus of 

 cheliped broad, compressed. Fourth and fifth lateral teeth much 

 reduced in male, second and third united at base. 



Description. — Carapace of male narrow behind. Front rather wide, 

 inner orbital tooth decidedly more advanced than outer tooth, rostral 

 teeth still more advanced and separated by a V interspace. Lateral 

 teeth five, blunt, the last two very small, the last one hardly more 

 than a tubercle; second tooth nearly as large as third, and not 

 entirel}^ separated from it. First movable segment of antennae rather 

 narrow. Chelipeds with manus compressed, upper edge sharp. 



The above notes were made in the Paris Museum on a male from 

 the Galapagos Islands. It is probably the specimen figured by 

 A. Milne Edwards (see my figs. 1-3, pi. 250), in which, however, the 



