82 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



Measurements. Male (22035), total length of carapace 29, width of 

 same 49, width at anterior base of lateral spine 44.4, fron to-orbital 

 width 22.7, width of front 7.2 mm. 



Variation. — Two specimens in a lot of 125 have a longer lateral 

 spine than usual, but it is not twice as long as the preceding tooth. 



Range. — Cape San Lucas, Mexico, to Ecuador. 



Material examined. — See table, page 83. 



PORTUNUS (ACHELOUS) FLORIDANUS, new species 



Plate 40 

 Portunus (Achelous) anceps Rathbun, Amer. Nat., vol. 34, 1900, p. 141; not 

 P. (P.) anceps (Saussure). 



Type locality. — Off Key West, Florida, 45 fathoms; holotype male, 

 Cat. No. 15043, U.S.N.M. 



Diagnosis. — Median teeth of front minute. Lateral spine of cara- 

 pace short. Two spines on upper margin of palm. Postero-distal 

 margin of merus of swimming legs entire. 



Description. — Carapace narrow, without strong ridges but with an 

 extensive pattern formed by bands of fine granules; branchial ridge 

 short, starting well forward at the gastric region, trending obliquely 

 backward and forming an obtuse angle opposite the seventh lateral 

 tooth; pubescence short, inconspicuous. Frontal teeth triangular, 

 very unequal, median pair acute, much smaller and much less advanced 

 than the lateral, which are blunt; median sinus reaching farther back 

 than lateral sinuses. Inner tooth of orbit obtusangled, anterior 

 margin obliquely transverse; only one superior orbital fissure and 

 that with a V-shaped opening; outer tooth narrow, viewed from above, 

 very wide and flat viewed from the side, and furnished with a tuft of 

 hair; outer sinus large, a Httle less than a right angle; inner tooth 

 very broad and blunt. Antero-lateral teeth 2 to 8 small, similar, 

 spiniform; sinuses U-shaped, the first the* widest, the next three 

 wider than the succeeding three. Lateral spine short, strong, much 

 larger than the adjacent spines, tip curving obliquely forward. 



Arm and chela expanded at middle; inner margin of merus armed 

 with two larger spines on distal half and 1 to 3 smaller spines or spin- 

 ules on proximal half; a small curved spine at distal end of outer 

 margin. Inner spine of carpus larger and outer spine smaller than 

 the propodal spine at the articulation. Two incurved spines on 

 upper margin of manus, one at the extremity, the other not far be- 

 hind. Merus of swimming leg longer than wide, postero-distal ex- 

 tremity unarmed. Proximal half of sixth segment of male abdomen 

 with parallel sides, sides of distal half convergent. 



Measurements. — Male holotype, total length of carapace 13, width 

 of same 20.6, width at anterior base of lateral spine 17.6, fronto-or- 

 bital width 11.8, width of front 3.6 mm. Female paratype, total 

 length of carapace 15.2, width 23.2 mm. 



