PART 1 GARTH : PACIFIC OXYRHYNCHA 275 



(Rathbun, 1898, 1907; Holmes?), the specimens so recorded being later 

 attributed to Pelia tumida (Rathbun, 1925). 



Nicaragua: Corinto, Zaca (Crane). 



Costa Rica: Jasper Island and Uvita, Zaca (Crane). 



Panama: Perico Island, Albatross (Rathbun, 1907) ; "Panama," 

 Sternbergh (Rathbun, 1925) ; Bahia Honda, Zaca (Crane). 



Atlantic analogue: Pelia mutica (Gibbes). (See Remarks below) 



Diagnosis: Carapace relatively broad, width from three- fourths to 

 four-fifths total length. Rostral horns with outer margins convergent, 

 length from one-fourth to one-eighth remainder of carapace. Basal anten- 

 nal article broad ; second movable article reaching or exceeding tip of 

 rostrum. Gape between fingers of adult male very wide, digital tooth 

 simple. Male first pleopod broad nearly to tip, sharply bent below aper- 

 ture, the thickened lip of aperture finely setose. 



Description: Carapace shorter and more triangular than in [Pelia 

 tumida], the rostrum much shorter, not more than one- fourth as long as 

 remainder of carapace in the old male, its outer margins converging 

 anteriorly, thus carrying out the triangular form of the carapace. Very 

 little of the basal antennal article visible from above ; its outer angle 

 tipped with a spine. 



Chelipeds in the well-developed male stouter than in [Pelia tumida] , 

 and about as long as the first pair of ambulatory legs ; palm wider, vary- 

 ing from 0.72 in the smaller specimen to 0.81 of its superior length in 

 the old ; a little narrowed distally and slightly constricted near the fixed 

 finger; fingers widely gaping for from half [in the young] to two-thirds 

 of their length in the old, slender, the basal tooth of the dactylus com- 

 paratively insignificant, the fixed finger arched very markedly downward 

 in the basal half, thus increasing the gape. (Rathbun, 1925) 



Material examined: 34 specimens from 15 stations. (See Table 56) 

 From Acapulco, Guerrero, Mexico, to 9.5 miles southwest of Zorritos 

 Light, Peru. 



Measurements: Male specimen from Changame, Panama: length 

 9.1 mm, width 6.2 mm, rostrum 1.6 mm, width 1.0 mm, cheliped 9.0 

 mm, chela 4.3 mm, dactyl 2.1 mm, height of palm 1.8 mm, ambulatory 

 legs ca. 11.2, 7.0, 5.0, and 4.5 mm, respectively. Ovigerous female from 

 Panama : length 6.6 mm, width 4.9 mm. 



Color in life: Bluish gray above, pile ochraceous yellow. Merus and 

 manus of chelipeds translucent buff peppered with black ; carpus and 

 chelae flame scarlet. Underparts buffy green. Eggs orange. (Crane, 





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