THE SPIDER CRABS OF AMERICA 85 



Orbits small, inclosing only base of eye peduncles; external angle 

 acute, spiniform; superior margin with one fissure, without teeth 

 and spines. Antennular fossae not deep, round, margins obtuse. 

 Basal article of external antennae small, armed at external angle 

 with a minute tooth or spine; movable part deprcssecK first and second 

 articles very broad. Epistome very short or wanting. Buccal cavity 

 very broad anteriorh^. Merus of outer maxillipeds subtriangular, 

 outer front angle prominent, distal margin longest; palpus very short 

 and stout, terminal article much narrower than the others. 



Found sparingly on the west coast of Mexico and Panama, and in 

 the Bahamas and West Indies. ^^ 



KEV TO THE SPECIES OF THE GENUS EUCINETOPS 



A^ Rostral horns long and narrow. 



B'. Rostral horns blunt at tips. Fingers of male gaping lucasii, p. 85. 



B'^. Rostral horns acute at tips. Fingers of male not gaping. _rubellula, p. 86. 

 A2. Rostral horns short and broad, tipped with a small spine. 



B*. Eyes reaching beyond postocular tooth by little more than length of 

 cornea panamensis, p. 87. 



B^. Eyes reaching beyond postocular tooth by half their length .blakiana, p. 88. 



Analogous species on opposite sides of the continent: hlahiana 

 (Atlantic); panamensis (Pacific). 



EUCINETOPS LUCASII Stimpson 



Eucinetops lucasii Stimpson, Ann,. Lye. Nat. Hist. New York, vol. 7, 1860, 

 p. 191 [63], female, not pi. 2, fig. 3, male (type-locality, Cape St. Lucas; 

 type not extant). — A. Milne Edwards, Crust. Reg. Mex., 1875, p. 119. 



Peltinia longioculis Lockington, Proc. California Acad. Sci., vol. 7, 1876 

 (1877), p. 76 [14] (type-locality, Lower California; type not extant). 



Diagnosis. — Horns blunt. Fingers of male gaping. Transorbital 

 width l^s than half greatest width of carapace in male. 



Description of female. — "Body and feet hairy above. Carapax 

 oblong, subquadrate, with very uneven surface, not granulated, 

 much depressed between the branchial and hepatic regions; gastric 

 region strongly prominent, with three small tubercles in a transverse 

 row across the middle. Protuberant parts of frontal region clothed 

 with curled hairs. Horns of the rostrum bluntly rounded at the 

 extremities. Lateral margins of the carapax without teeth or spines. 

 Feet moderate, cylindrical, unarmed. Inferior surfaces short- 

 pubescent, not densely so." (Stimpson.) 



Description of male. — "Posterior portion of carapax broadly trian- 

 gular, post-orbital spine expanded, trans-orbital width rather less 

 than half the greatest width; rostnim short, stout, bifid. Stomachal 

 region prominent. Fixed joint of external antennae emarginate at 



'» Eucinetops ? stimpsoni Miers, Ann. Mag. Nat. HisU, ser. 5, vol. 4, 1879, p. 3, is probably not a true 

 Eucinetops, but may be called Anacinetops as Miers suggested. 



5487— 2.5t S 



