COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 145 



Description: Carapace about as broad as long in males, slightly 

 broader (1.1 or 1.2 times) in females; lightly plicate on posterolateral 

 and frontal regions, otherwise smooth; devoid of hairs. Front in dorsal 

 view either transversely sinuous or with three shallow lobes, the median 

 one broad and rounded, lateral ones narrow, diverging; trilobate in 

 frontal view, the lobes about equal in breadth, lateral ones diverging, 

 median one slightly produced. Outer orbital angle strongly produced 

 into a narrow, acute tooth. Separated portion of side wall consisting of 

 one large piece and numerous fragments. 



First movable segment of antenna with a conical tubercle on anterior 

 margin ; second and third nearly smooth ; flagellum naked. 



Chelipeds devoid of hairs. Merus faintly rugose, with a broad, 

 strongly projecting subtriangular lobe on anterior margin. Carpus with 

 a broad, strongly projecting lamellar lobe occupying entire anterior 

 margin, its edge sinuate and forming three indistinct lobes, the proxi- 

 mal one the largest; surface of lobe and carpus nearly smooth, carpus 

 becoming roughened toward posterior margin, latter bearing a distinct, 

 obliquely rugose crest. Manus nearly smooth; outer margin with a 

 smooth crest extending onto pollex, defined by a distinct groove near 

 margin. Fingers smooth, usually slightly gaping in major cheliped, meet- 

 ing entire length in minor cheliped ; no pubescence in gape. 



Walking legs covered with long, flexible setae, more thick-set on 

 three distal segments. 



Telson of abdomen with five plates. No pleopods in male. 



Variations: In smaller specimens the lobe on the anterior margin 

 of the carpus is more distinctly divided into three; in occasional large 

 examples it is entire. 



Material examined: See Table 45. 



Measurements: Males, 2.8 to 7.0 mm; non-ovigerous females, 3.0 

 to 5.8 mm ; ovigerous females, 2.4 to 6.7 mm. Glassell's neotype female 

 measures 5.8 mm, his neoallotype male 5.5 mm. The male holotype of 

 Pisosoma aphrodita Boone is 4.0 mm in length. 



Color: Carapace carmine, slightly darker on frontal and margins. 

 A large white blotch on anterolateral just below eye, and a halfmoon- 

 shaped spot of white on each side of cardiac area. Striations and 

 punctations also white. Eyestalk dark carmine and eye black. Antennule 

 white and last segment yellow. Antenna brownish red, becoming lighter 

 toward tip. Chela very dark carmine, a blackish tint on outer surface. 

 Tips of fingers white. Walking legs same as carapace but with brownish 



