138 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.24 



Walking legs lightly rugose, surface with rather strong, flattened 

 granules; carpus and propodus, and to a lesser extent merus, of legs 

 2 and 3 thickly covered with long plumose hairs. 



Abdomen smooth; telson seven-plated in males, nearly always in- 

 completely so in females. No pleopods in male. 



Variations: In some specimens there are enlarged granules forming 

 two more or less regular longitudinal rows along the outer part of the 

 manus of the major cheliped, and a few granules grouped together near 

 the gape of the fingers. In a few of the specimens from Bahia Tangola- 

 Tangola these larger granules are bunched together to form several 

 large tubercles, the one at the gape of the fingers being particularly 

 outstanding. In these same specimens the tubercles are present, but less 

 distinctly, on the minor cheliped also. 



The teeth on the outer margin of the carpus are quite strongly pro- 

 jecting m occasional examples, and in others tend to divide slightly 

 along their edges. 



The tubercle on the cutting edge of the pollex is usually larger and 

 more projecting than is shown in the illustration of the holotype 

 (Plate 10, fig. 1) but in one or two specimens it was entirely lacking. 



Measurements: Holotype male: length 5.1 mm, width 5.9 mm. Para- 

 types: males, 2.4 to 5.3 mm; non-ovigerous females, 2.3 and 5.0 mm; 

 ovigerous females, 2.5 to 6.6 mm. 



Color: All the specimens examined had faded in alcohol to a pale 

 orange-buff. In some examples the tips of the fingers are white. 



Ecology: Specimens from Bahia Tangola-Tangola were recovered 

 from coral ; the single specimen from Bahia Santa Lucia was taken 

 from sponge dredged in 1-4 fathoms. The rest of the material for which 

 data are available was found on rocky reefs, presumably concealed under 

 stones. 



Ovigerous females were taken in every month from January through 

 May. 



Relationships: Pachycheles calculosus appears to be most closely 

 related to P. greeleyi (Rathbun), 1900, a Brazilian species. In both 

 forms the carapace and chelipeds are nearly devoid of hairs, the chel- 

 ipeds are covered with granules, the telson of the abdomen is seven- 

 plated, and male pleopods are lacking. In P. greeleyi the carapace is some- 

 what rugose, the outer orbital angle is produced into a distinct tooth, 

 and the granules of the chelipeds and the tubercles on the cutting edges 

 of the fingers are vmlike those of P. calculosus. 



