292 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



Cycloxanthus vittatus A. Milne Edwards, Crust. Reg. Mex., 1879, p. 259, 



pi. 46, fig. 5-5d. 

 Cycloxanthops vittatus Rathbun, Mem. Mus. Coinp. Zool., vol. 35, 1907, p. 70. 



Diagnosis. — Carapace narrow, rugose; some transverse lines. A 

 denticle on slope of inner-upper angle of orbit. Superior orbital 

 margin between fissures advanced, dentiform. 



Description. — Carapace very narrow, anteriorly more lobulated 

 than in C. sexdecimdentatus , lobules rugose and crossed by some 

 transverse lines. Front separated from the superior inner angles 

 of orbit by a deep furrow ; these angles are tuberculiform and directed 

 a little outward at tip and bear a denticle on their outer border; 

 a few hairs on edge of front; orbital border interrupted by two 

 fissures, either side of a projecting tooth. Lateral teeth well sepa- 

 rated, very unequal, fourth, sixth, eighth, and ninth mucb reduced. 

 Lateral border hairy below the teeth. Upper surface of carpus and 

 manus feebly eroded; a short blunt tooth behind distal angle of 

 carpus; secondary inner tooth reduced. Palms short and broad, 

 both margins aicuate; color of immovable finger continued a little 

 on palm. 



Color. — Yellowish grey ; carapace with 1 1 longitudinal stripes of 

 red (Stimpson). Fingers dark brown. 



Measurements. — Male (3208), length of carapace 17.6, width of 

 same 23.5, fron to-orbital width 10.6, width of front 5.3 mm. 



Range. — From Cape St. Lucas, Lowef California, Mexico, to 

 Panama. 



Material examined. — Cape St. Lucas, Mexico ; JohnXantus, collector; 

 9 small specimens, cotypes (1260, M.C.Z.). 



Puerto Angel, State of Oaxaca, Mexico; 1910; C. R. Orcutt, collec- 

 tor; 1 male (50924). 



Panama: Specimens named by Stimpson, not including the 

 measured type (M.C.Z.). John M. Dow, collector; 2 males, 2 females 

 (3208). 



Perico Island, Panama; October 26, 1904; Albatross; 1 male (33276) 



CYCLOXANTHOPS NOVEMDENTATUS (Lockington) 



Plate 134, Figure 1; Plate 135, Figures 2 and 3 

 XaJithodes / novemdentafus Lockington, Proc. California Acad. Sci., vol. 7, 1876 



(1877), p. 32 [5] (type-locality, San Diego; tj-pe not extant). 

 Xantho novetn-dentatus Lockington, Proc. California Acad. Sci., vol. 7, 1876 



(1877), p. 99 [5]. 

 Cycloxanthus californiensis Rathbun, Proc. U. S. Nat. Mus., vol. 16, 1893, p. 237 



(type-locality, Guadalupe Island, L. Cat; type. Cat. No. 17395, U.S.N.M.). 

 Cycloxanthops novem-denlatus Holmes, Occas. Papers California Acad. Sci., 



vol. 7, 1900, p. 56. 

 Cycloxanthops rugosa Holmes, Occas. Papers California Acad. Sci., vol. 7, 1900, 



p. 59 (type-locality, San Diego; type in Mus. Univ. Cat). 

 Cycloxanthops novemdentafus Rathbun, Harriinan Alaska Exped., vol. 10, 1904, 



p. 180, pi. 7, fig. 10. 



