No. 10 GARTH : BRACHYURAN FAUNA OF THE GALAPAGOS 467 



Remarks. — This Trapezia-like xanthid was not encovmtered by the 

 earlier Allan Hancock Expeditions, and it remained for the cruise of 1938 

 to turn it up in any numbers. The finding of 2 males, 2 females, and 3 

 young in Sulivan Bay, James Island, proves that it must occur with some 

 frequency on the right type of bottom, which in this case was sand with 

 some rock. 



E. bifrons is now known to occur at two localities, James and Sey- 

 mour, other than the type locality, Chatham. The first male specimen has 

 also been found. 



Description of the rnale. — The description of Ectaesthesius bifrons as 

 given by Rathbun for the female is applicable to the male with the follow- 

 ing exceptions : 



1. In the female, the major and minor chelae are apparently alike 

 and are similar to the minor chela of the male. The major chela of the 

 male is higher than the minor and more swollen. The dactylus is con- 

 siderably shorter than the superior margin of the palm. The inferior 

 margin is less sinuous than that of the minor chela and is almost straight. 

 The pollex is short and thick, bearing on its inner margin a raised ridge 

 which may represent 2 low teeth worn down to their bases. The tips of 

 the fingers are blunt, incurving, that of the fixed finger having a hooked 

 appearance. 



2. The male abdomen has 7 free segments, as has the female, a fact 

 which should be mentioned in the generic description. The first two seg- 

 ments are narrow, the third is widest, its edges broadly convex, the fourth 

 and fifth segments narrowing anteriorly, the sixth rectangular, almost 

 square, and the seventh broadly rounded. All 7 segments are fringed with 

 hair. 



3. There is a tiny papilla on the inner distal margin of the merus of 

 the cheliped. 



Genus PARAXANTHIAS Odhner (part), 1925 



Paraxanthias insculptus (Stimpson) 



Plate 78, Figs. 1, 2 



Xanthodes insculpta Stimpson, Ann. Lye. Nat. Hist., New York, vol. 10, 



p. 105 (15), 1871. 

 Pilumnoides pusillus Rathbun, Proc. Washington Acad. Sci., vol. 4, p. 



281, pi. 12, figs. 9 and 10, 1902. Boone, Zoologica, vol. 8, no. 4, p. 



215,fig. 78, 1927. 

 Xanthias insculpta Rathbun, Zoologica, vol. 5, p. 157, fig. 38, 1924. 



Boone, Zoologica, vol. 8, no. 4, p. 207, figs. 74A and B, 1927. Fin- 



negan, Journ. Linn. Soc. London, vol. 37, p. 634, 1931. 



