400 BULLETIN 129; UNITED STATES NATIONAL MUSEUM 



MITHRAX (MITHRAX) VERRUCOSUS Milne Edwards 



Plate 144 



fCangrejo Denton Parra, Descripcion de diferentes piezas de historia natural, 



1787, p. 136, p. 51, fig. 1. 

 Mithrax verrucosus Milne Edwards, Mag. Zool., vol. 2, 1832, class 7, pi. 4 



(colored) and explanation (type-locality, under stones in Robert Bay, 



Martinique; type in Paris Mus.). — Rathbun, Proc. U. S. Nat, Mus., 



vol. 15, 1892, p. 265, and synonymy; not Proc. Washington Acad. Sci. 



vol. 2, 1900, p. 142. 

 fMiihrax irispinoszis Kingsley, Proc. Boston Soc. Nat. Hist., vol. 20, 1879, 



p. 148 (type-locality, Florida; type not extant). 

 Mithrax aculeatus Rathbun, Proc. U. S. Nat. Mus., vol. 15, 1892, p. 264. 



Not M. aculeatus (Herbst) Milne Edwards. 

 Mithrax verrucosus, variety, Rathbun, Ann. Inst. Jamaica, vol. 1, 1897^ 



p. 9. 

 Mithrax plumosus Rathbun, Bull. U. S. Fish Comm., vol. 20, for 1900, pt. 2 



(1901), p. 67 (type-localitj-, Puerto Real, Porto Rico; holotype. Cat. No. 



23775, U. S. N. M.). 



Diagnosis. — Size medium to large. Dorsum closely paved with 

 flat granules. Margins spinous. Wrist nearly smooth above, 3 

 tubercles on inner edge. 



Description of fully developed male. — Ceivical suture very deep. 

 Carapace covered with flattened and closely crowded granules; 

 nearly naked, although the granules are covered with small pits; a 

 few dorsal spines on outer part of branchial region; spines of front 

 and orbit truncate. Rostral horns short, separated by a deep 

 sinus. Preorbital spine directed a little outward; 4 other spines on 

 the orbital margin besides those on the antennal segment; in aU, 3 

 spines on the broad basal segment of the antenna, the middle tooth 

 the most advanced. On the antero-lateral margin 8 spines in pairs, 

 the anterior spine of each pair the smaller, the spines of each of the 

 first 2 pairs more or less united at base; a small postero-lateral 

 spine. Below the lateral margin a row of about 9 spines. 



Chelipeds stout; 6 sharp spines on outer margin of merus; a row 

 of 6 spines on outer half of upper surface and 1 or 2 spines on 

 inner half; inner margin of cheliped armed with blunt spines or 

 lobes, one on the ischium, 4 on the merus, the distal 2 of which are 

 at either end of a truncate lobe, and 3 or sometimes 2, on the carpus; 

 dorsal surface of carpus smooth or nearly so, may be a little tuber- 

 culate toward proximal end; palm unarmed, elongate, a little swollen; 

 fingers gaping, a large tooth on the dactyl near middle of gape, edges 

 of the large spoon-shaped tips faintly crenulate, 2 bunches of hair 

 inside the spoon. 



Legs covered with coarse hair; merus and carpus spiny. 



Color. — Vinous red (Desbonne). Color largely concealed by hairi- 

 ness. Carapace very dark dull red, the pincers olive above and 

 lighter olive below, tips claret-colored, teeth white; under side of 



