NO. 8 HAIG: THE ATLANTIC GALATHEIDEA 9 



more hairy than in P. chacci. These differences were apparent in all the 

 material examined, including the four examples collected by Velero III 

 and twelve borrowed from the U. S. National Museum. 



All the material examined had traces, at least, of hair on the manus, 

 and in some specimens the manus w^as covered with a thick pile of fine 

 hairs. This character was not mentioned by Benedict and is not evident 

 from his illustration, which was apparently made from a specimen with- 

 out a distinct pile of hairs. 



The only other western Atlantic Pachycheles in which the telson of 

 the abdomen has seven plates seems to be P. greeleyi (Rathbun), known 

 at present only from Brazil. The latter species resembles both P. serra- 

 tus and P. chacei in having granulate chelipeds and a similar arrange- 

 ment of teeth on the anterior margin of the carpus, but is unlike them 

 in several respects : it is more coarsely granulate, has a more rugose 

 carapace and walking legs, and differs in the shape of the fingers and 

 the size and arrangement of the teeth on their cutting edges. 



Pachycheles chacei, new species 

 Plate 1 



Pachycheles serrata Schmitt, 1935, pp. 184, 185 (part). Not P. serratus 

 (Benedict). 



Holotype. — Ovigerous female, AHF 3917, from Sta. A50-39, Bahia 

 Caledonia, Panama, Apr 26, 1939, shore, collected by Velero III. 



Paratypes. — 

 A50-39. Bahia Caledonia, Panama; Apr 26, 1939; shore. 2c?, 2?ov. 

 Cartagena, Colombia; Colegio de "San Pedro Apostal." 2c?, 

 l?ov. (U.S.N.M. Cat. No. 53413.) 



Measurements. — Length of holotype, 3.7 mm; width, 4.1 mm. 

 Length of paratypes: males, 3.1 to 4.4 mm; ovigerous females, 3.5 to 

 4.5 mm. 



Diagnosis. — Chelipeds entirely covered with granules, devoid of 

 hairs. Carpus with a row of about eight teeth on anterior margin. Telson 

 of abdomen with five plates. 



Description. — Carapace slightly broader than long, subquadrate, 

 the regions not distinct; faintly squamose on lateral and posterior mar- 

 gins, othei-wise smooth; devoid of hairs. Front narrow, faintly convex 

 in dorsal view. Orbits rather shallow; inner orbital angle nearly rec- 

 tangular, outer orbital angle only slightly projecting. Lateral wall of 

 carapace lightly rugose; posterior portion divided into one large and 

 two small pieces, separated by membranous interspaces. Merus of outer 

 maxillipeds smooth or lightly punctate. 



