438 BULLETIN 129^ UNITED STATES NATIONAL MUSEUM 



Description (after Kingsley). — Carapace naked, depressed, deeply 

 areolate, areolations less broken than in M. sculptus, punctate; a 

 transverse row of five tubercles on the gastric region and two more 

 acute ones on the outer posterior portion of each branchial region, 

 two prominent tubercles at the base of the rostrum, one on each side 

 of the median line. Rostrum short, outer margin of horns arcuate, 

 inner straight. Orbits with one distinct fissure above, inner angle 

 prominent, rounded; outer angle also rounded but less prominent; 

 external hiatus a round opening. Antero-lateral margin with 3 teeth 

 besides the external angle of the orbit; first and second teeth stout, 

 prominent, obtuse, the second the larger; third tooth slender, acute, 

 hooked forward; a small acute tooth on the posterolateral margin 

 behind the lateral angle. A tubercle on the subhepatic region beneath 

 the first tooth of the antero-lateral margin. An oblique row of 

 rounded tubercles running backward from the palatal region. Basal 

 joint of antenna with two short blunt teeth. 



Chelipeds small; posterior margin of merus 4-toothed, upper surface 

 with one tooth, inner margin with a single rounded tubercle; carpus 

 prominently tuberculate; hand smooth, inflated, cristate above at the 

 base, a small depressed tubercle on the outer surface at the articula- 

 tion with the carpus; fingers moderately gaping, denticulated at the 

 extremity, a basal tooth on the dactylus in both sexes, but larger in 

 male. Legs with spinous tubercles on the basal joints, becoming 

 obsolete on the distal joints; dactyli strongly arcuate. 



Color. — In spirits, light red (Lockington) . Carapace and legs 

 ochraceous yellow (Cano). 



Measurements. — Male, cbtype, length 16, width 18.5 mm. (Lock- 

 ington); male, length 11, width 13.5 mm. (Kingsley); female, length 

 11.7, width 15 mm. (Kingsley). 



Range. — San Diego, Cahfornia; Gulf of California (type-locality); 

 Pearl Islands, Bay of Panama (Cano). 



Material examined. — San Diego, California (locality supposedly 

 correct) ; 1 young specimen, dried (53961) ; gift of San Diego Society 

 of Natural History. 



MITHRAX (MFTHRACULUS) CINCTIMANUS (Stimpson) 



Plate 158 



Mithraculus cinclimanus Stimpson, Amer.« Journ. Sci., vol. 29, 1860, p. 132 

 {nomen nudum); Ann. Lye. Nat. Hist. New York, vol. 7, 1860, p. 186 

 (type-localities, Tortugas and St. Thomas; types not extant). — A. Milne 

 Edwards, Crust. R6g. Mex., 1875, p. 112, pi. 23, fig. 3. 



Mithrax affinis Desbonne in Desbonne and Schramm, Crust. Guadeloupe, 

 1867, p. 10 (type-locality, Guadeloupe; cotype in Paris Mus.). 



Mithrax cindimanus Miers, Challenger Rept., Zool., vol. 17, 1886, p. 87. 



Diagnosis. — Carapace longer than broad. Four antero-lateral 

 teeth, either acute or tuberculiform. Two teeth on anterior margin 

 of basal antennal joint. 



