NO. 3 GARTH : SOME NEW SPECIES OF BRACHYURAN CRABS 81 



Abdomen of male with third segment narrower than first, second 

 narrower than third. Terminal segment broader than long, tip rounded. 

 Abdomen and sternum paved with fine, flat granules. 



Distribution: The 33 specimens referred to this species all come from 

 Costa Rican stations. 



Remarks: The proposed new species occupies a range which overlaps 

 that of two other common Pacific Hexapanopeus, H. sinaloensis Rathbun 

 (1930) and H. orcutti Rathbun (1930). From the former it may be 

 distinguished by the fused first and second lateral teeth, separated in 

 sinaloensis by a U-shaped sinus and by the subquadrate merus of the 

 outer maxilliped, that of sinaloensis being subtriangular. (See pi. 21, fig. 

 4.) From H. orcutti it may be separated by the absence of outer frontal 

 lobes, the fusion of the first two lateral teeth, the presence of a basal 

 digital tooth, and the fact that the color of the fingers ends abruptly at 

 the interdigital sinus, that of orcutti extending some distance on the 

 palm. (See pi. 21, fig. 2.) 



In many respects the new species comes closest to H. cartagoensis 

 Garth (1939) from the Galapagos Islands. However, the more nodose 

 carpus and the superior furrows of the cheliped, the more nearly trun- 

 cate and lobeless front, and the greater width of the male terminal ab- 

 dominal segment of H. costaricensis will serve to distinguish it clearly. 

 (See pi. 21, fig. 3.) 



A complete analysis of the Pacific species of Hexapanopeus with keys 

 to new species described from Hancock collections will appear in a 

 forthcoming report. 



Genus HETERAGTAEA Lockington 



Heteractaea peterseni, new species 

 Plate 22, Figs. 1-5 



Type: Female, holotype. Cat. No. 79151, U. S. National Museum, 

 from north end of channel, Octavia Bay, Colombia, 35-40 fathoms, 

 coarse sand gravel, specimen cracked from rock; January 27, 1935; col- 

 lected by Allan Hancock Expedition of 1935 at Velero Station 429-35. 



Measurements: Female holotype: length of carapace 17.5 mm., 

 width 26.8 mm., of front 7.3 mm., of fronto-orbit 14.3 mm., length of 

 major cheliped 27.8 mm., of major chela 16.5 mm., of dactyl 8.9 mm., 

 height of palm 9.6 mm. 



