134 RATHBUN 



Order DECAPODA. 

 Family OCYPODIDiE. 



OCYPODE ALBICANS Bosc. 



Ocypode albicans Bosc, Hist. Nat. Crust., I, 196, pi. iv, fig. i, 1802 (figure 



inaccurate). ^ 

 Ocypode arenaria Say, Jour. Acad. Nat. Sci. Phila., i, 69, 1817. 

 Ocypode arenaria Milne Edwards, Hist. Nat. Crust., 11, 44, pi. xix, figs. 



13-14, 1837. 



Trai9ao, near Mamanguape River; one male. 



Maceio, Alagoas, on coral reef and sand beach; two males. 



UCA MARACOANI (Latreille). 



Ocypode Juaracoani'LkTV.Y.WA.^, Hist. Nat. Crust., vi, 46, 1803. 

 Gelashnus maracoani Latreille, Diet. Hist. Nat., xii, 519, 1817 ; Milne 

 Edwards, Ann. Sci. Nat. (3), xviii, 144 [108], pi. in, fig. i, 1852. 



Natal, Rio Grande do Norte; six males, one female. 

 Mangroves, Rio Parahyba do Norte at Cabedello ; one male, one 

 female. 



UCA MORDAX (Smith). 



Gelasimus mordaxSujTH, Trans. Conn. Acad. Sci., 11, 135, pi. 11, fig. 3 ; pi. 



IV, figs. 4, 4a, 1870. 

 l/ca 7nordax Rathbun, Proc. U. S. Nat. Mus., xxii, 276, 1900. 



Pernambuco, on mangroves ; one male. 



UCA THAYERI sp. nov. 



Plate VIII, figs, i and 2. 



Carapace very broad in its anterior fourth, narrowing rapidly in its 

 posterior three-fourths ; antero-lateral angles almost rectangular, blunt. 

 Sometimes the carapace is narrower at the orbital angles than a little 

 behind that point, caused by the curving inward, at the lateral angle, 

 of one or both of the lateral margins. The dorsal furrows are deep, 

 especially the cervical, and the transverse gastro-cardiac furrow ; less 

 deep are the obliquely longitudinal branchial furrow and the post- 

 orbital. vSurface finely and densely granulate through the lens, and 

 tomentose, the hair retaining particles of mud. 



' I have restored Bosc's name to this crab, as his description was made from 

 specimens on the coast of Carolina, where no other species of the genus occurs. 

 The fact that in the figure the artist has represented the eyes with stalks be- 

 yond the cornete does not, I think, invalidate the species. Say was the first bi- 

 nomial writer to use the specific name arenaria. 



