158 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



ered with short non-plumose setae, and a few longer plumose hairs along 

 posterior margin; ventral surface smooth. Manus nearly smooth dor- 

 sally, with projecting granules toward outer margin ; covered with short 

 non-plumose setae, those toward outer margin a little longer than those 

 of carpus, and outer margin with a few long plumose hairs ; ventral sur- 

 face granulate toward outer margin, otherwise smooth. Dactylus of ma- 

 jor cheliped strongly curved, with three longitudinal rows of small gran- 

 ules on dorsal surface, and a few plumose and non-plumose hairs near 

 proximal end ; cutting edge with a double row of small granules and a 

 large proximal tubercle; pollex shorter than dactylus, broad and flat- 

 tened, with non-plumose setae nearly to tip, and a large tubercle on 

 cutting edge ; fingers slightly gaping, gape with a few short plumose 

 hairs. Dactylus of minor cheliped finely granular, with a few short, 

 scattered, non-plumose setae near proximal end ; pollex broad and flat- 

 tened, roughly granular, with somewhat longer non-plumose setae ex- 

 tending nearly to tip, outer edge serrate ; fingers meeting for entire 

 length, gape with a trace of plumose hairs. 



Walking legs faintly rugose ; all segments with a thick fringe of long 

 plumose hairs along anterior margin. 



Abdomen smooth ; telson seven-plated in males, incompletely so in 

 females. No pleopods in male. 



Measurements: Holotype male: length 4.7 mm, width 5.4 mm. Para- 

 type ovigerous females: length 4.7 mm, width 5.3 mm; length 4.8 mm, 

 width 5.3 mm. 



Color: In alcohol all three specimens had faded to a pale buff, and 

 original distinguishing marks, if any, had disappeared. 



Ecology: No data were provided for either collecting station. Pre- 

 sumably the specimens were taken in the intertidal zone, probably under 

 stones. 



The ovigerous female paratypes were taken in April. 



Relationships: This new species resembles Pachycheles panamensis 

 Faxon, but differs in the shape of the fingers, the presence of plumose 

 hairs on the front, chelipeds, and walking legs, and the absence of male 

 pleopods. 



Remarks: The specific name trichotus is derived from the Greek 

 Tpi;)(<j)T05, hairy. 



Range: Known so far from only two localities, Acajutla, El Salva- 

 dor, and Isla Verde, Panama. 



