140 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Movable segments of antenna smooth or lightly granular, without 

 anterior projections; flagellum naked. 



Merus of chelipeds rugose, with a large, rugose, strongly projecting 

 subtriangular lobe on anterior margin. Anterior margin of carpus with 

 three strong teeth, the proximal one largest, covered with small gran- 

 ules; surface of carpus with large granules, somewhat imbricate, de- 

 pressed or obsolescent in anterior two-thirds, more projecting toward the 

 obliquely rugose posterior margin ; covered with plumose hairs, latter 

 longer toward outer margin, sometimes scarcely evident in anterior two- 

 thirds of surface. Manus covered with granules, somewhat smaller 

 than those of carpus and more projecting toward outer margin ; covered 

 with plumose hairs, latter longer on outer margins and sometimes ex- 

 tending onto proximal half of pollex. Dactylus long and slender, devoid 

 of hairs; pollex shorter, curved, devoid of hairs at least in distal half; 

 fingers punctate or lightly granular, gaping and crossing at tips in 

 major cheliped, meeting for entire length in minor cheliped, gape with- 

 out pubescence. 



All segments of walking legs thickly covered with long plumose 

 hairs, a few scattered, non-plumose setae interspersed with them. 



Telson of abdomen seven-plated in males, sometimes incompletely 

 so in females. A pair of pleopods in male. 



Material examined: See Table 44. 



Measurements: Males, 2.9 to 8.2 mm; non-ovigerous females, 3.1 to 

 8.4 mm; ovigerous females, 3.3 to 8.4 mm. One of Lockington's types 

 was reported to be 9 mm in length. 



Color: Color (in alcohol) bright red, deeper on the chelipeds. (Lock- 

 ington) Color in life has not been noted. 



Ecology: Most of the Velero III and IV material was taken in 

 the intertidal zone, under stones; the species was dredged on one oc- 

 casion in 7 fathoms (substrate not recorded) and once in 25-28 fathoms 

 from a bottom of sand, mud and shell. Steinbeck and Ricketts (1941) 

 reported it from coral interstices and on or about Pinna. 



The writer has examined ovigerous female specimens taken in every 

 month from January through May. Lockington reported ovigerous fe- 

 males in August or September. 



Relationships : Pachycheles setimanus is closely related to the west 

 Atlantic species P. serratus (Benedict), 1901, which like it has a seven- 

 plated telson, pleopods present in males, depressed granules on the an- 



