540 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



broadly crenate or lobulate; postero-lateral borders convergent, 

 about as long as or shorter than antero-lateral. Front rather 

 broad (considerably more than a fourth, the greatest breadth of 

 carapace), obliquely deflexed, cut into four lobules or teeth of about 

 equal size, separated from orbit by a notch. Orbits deep, rather 

 small, the grooves near outer angle inconspicuous; eyes on short, 

 thick stalks. The antennules fold nearly transversely. Basal anten- 

 nal article prolonged between side of front and orbital plate; the 

 flagellum, which is very small (about half the major diameter of the 

 orbit in length,) stands in the orbital hiatus. The ridges of the endo- 

 stome, defining the expiratory channels, are very strong, and the 

 opposed margin of the merus of the external maxillipeds is notched, 

 usually very deeply, so that a permanent expiratory orifice results. 

 Chelipeds massive, unequal in both sexes; the fingers of good length, 

 pointed, not hollowed. The abdomen of the male consists of seven 

 segments. 



Indo-Pacific region; both sides of middle America. 



KEY TO THE AMERICAN SPECIES OF THE GENUS OZIUS 



A'. Carapace less than one and a half times as wide as long. Size large. Chelipeds 



smooth verreauxii, p. 540. 



A-. Carapace more than one and a half times as wide as long. Size small. Cheli- 

 peds rough. 

 B^ Minor manus more than half as high as major. Lateral border marginate. 

 CK Inner surface of manus not swollen near proximal end. Anterior 

 and antero-lateral borders together not broadly arched. 



reticulatus, p. 542. 

 C^. Inner surface of manus swollen near proximal end. Anterior and 



antero-lateral borders together broadly arched perlatus, p. 543. 



B2. Minor manus not more than half as high as major. Lateral border 

 thick, not marginate agassizii, p. 544. 



ANALOGOUS SPECIES ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic Pacific 



reticulatus perlatus 



Ozius rugosus Milne Edwards and Lucas, "Chili,"^^ is a synonym 

 of Lydia tenax (Ruppell), which inhabits the western part of the 

 Indian Ocean, from the Red Sea to Baluchistan. "Chili" is very 

 likely an error in locality. 



OZIUS VERREAUXn Saussure 



Plate 219; Plate 220, Figure 3 



Ozius verreauxii Saussure, Rev. Mag. Zool., ser. 2, vol. 5, 1853, p. 359 [6], pi. 



12, fig. 1 (type-locality, Mazatlan, Mexico; type not extant). — A. Milne 



Edwards, Crust. Rdg. Mex., 1880, p. 277, pi. 5, fig. 4. 

 Xantho grandimanus Lockington, Proc. California Acad. Sci., vol. 7, 1876 (1877), 



p. 98 [4] (type-locality. La Paz, L. C; type not extant). 



" In d'Orbigny's Voy. I'Amer. M(5rid., vol. 6, pt. 1, 1844, p. 17; atlas, vol. 9, 1847, pi. 8 bis. 



