274 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



KEY TO THE AMERICAN SPECIES OF THE GENUS MEDAEUS 



A'. Palm with a superior lobate crest. 



B '. Carpus of ambulatory legs with a multidenticulate crest. 



spinimanus, p. 274. 



B 2. Carpus of ambulatory legs with a trilobed crest lobipes, p. 275. 



A2. Palm without lobate crest, and armed with spinules only.-spinulifer, p. 276. 



ANALOGOUS SPECIES OF MEDAEUS ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic Pacific 



spinimanus lobipes 



MEDAEUS SPINIMANUS (Milne Edwards) 



Plate 113 



Cancer spinimanus Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 378 



(type-locality unknown; type in Paris Mus.). 

 Cancer miniatus Desbonne and Schramm, Crust. Guadeloupe, 1867, p. 23, pi. 4, 



fig. 3 (type-locality, Guadeloupe; type not extant). 

 Medaeus spinimanus A. Milne Edwards, Ann. Soc. Entom. Francie, vol. 7, 1867, 



p. 270; Crust. R6g. Mex., 1879, p. 250; 1880, pi. 44, figs. 3-36. 



Diagnosis. — Carpus of ambulatory legs with a multidenticulate 

 crest. Distal end of abdominal segments of male without a band of 

 pubescence. Tuberculation of carapace coarse and conspicuous. 



Description. — Carapace bare, strongly lobulated especially anteri- 

 orly; all the prominent parts granulate, all the furrows smooth. 

 Front most advanced in the middle, lobes oblique, a narrow median 

 fissure, best seen from below where it is continued to the point of the 

 epistome. Orbits subcircular; infero-internal angle more produced 

 than basal article of antenna. Antero-lateral border cut into four 

 triangular teeth which are united by a denticulate crest; the first 

 tooth which is the smallest is placed below the level of the outer 

 orbital angle. Pterygostomian regions, outer maxillipeds and ster- 

 num granulate. 



Chelipeds short and stout; arm not projecting beyond carapace, 

 granulated below; wrist rugose and granulate outside and above, two 

 somewhat conical teeth at inner angle; hand surmounted by a crest 

 cut into five large teeth, and ornamented outside with raspberrylike 

 tubercles arranged more or less in longitudinal rows and separated by 

 irregular, crowded granules; fingers broad, deeply channeled, pre- 

 hensile edges meeting when closed; above the dactylus a crest the 

 edge of which is feebly granulate in its proximal half. Color of 

 immovable finger not continued on palm. Ambulatory legs rather 

 long, covered with granules or spinules, margins hairy except the 

 dactyls which are hairy all over. 



Abdomen of male narrow, basal half granulate. 



Color. — Carapace yellowish gray spotted with vermilion; chelipeds 

 vermilion, legs spotted with the same; fingers brown (Desbonne). 

 Orange red (A. Hyatt Verrill). 



