NO. 2 GARTH : NEW BRACHYURAN CRABS 19 



Male abdomen with basal segment occupying entire width of ster- 

 num, second segment little more than half the width of first, third seg- 

 ment again wider; abdomen narrowing to base of sixth segment, which 

 is broader than long; tip of seventh segment rounded. 



In the female allotype the front is more truncate than in the male 

 holotype, the lateral lobes less advanced. The chelae, particularly the 

 major, are less inflated and show a granulate superior crest with a well- 

 defined sulcus. 



Remarks: This species may be distinguished from H. carihhaeus 

 (Stimpson) (1871) by the independent fifth lateral tooth, which is de- 

 cidedly more than "a section from the posterior slope of the fourth" 

 (Rathbun) ; from H. sinaloensis Rathbun (1930) by the oblique front 

 with lateral lobes, the front of sinaloensis being truncate and lobeless; 

 from H. orcutti Rathbun (1930) by the reduction of the second tooth, 

 the less granular appearance of the elevations of the carapace and cheli- 

 peds; and from all three by the lack of a superior furrow on the large 

 claw of the adult male. Examination of paratypes of H. setipalpus 

 Finnegan (1931), kindly loaned by Dr. Isabella Gordon of the British 

 Museum, shows the second lateral tooth almost equally advanced with 

 the first instead of obsolescent, the conspicuous hairy palpus as long as 

 the combined merus and ischium of the outer maxilliped instead of half 

 their length, and the strong tooth of the manus located on the pollex 

 instead of on the dactyl, as shown by figure 2 of plate 6. 



Genus KRAUSSIA Dana 



Kraussia americana, new species 



Plate 7, Figs. 1-4 



Type: Male, holotype, Cat. No. 371, Allan Hancock Foundation, 

 The University of Southern California, from Puerto Refugio, Angel de 

 la Guardia Island, Gulf of California, Mexico, 8-10 fathoms; March 

 20, 1937; one male, paratype, same locality and date; collected by Allan 

 Hancock Expedition of 1937 at stations 705-37 and 706-37, respec- 

 tively. 



Measurements: Male holotype: length of carapace 10.9 mm., 

 width 14.7 mm., of front 6.3 mm., length of chela along superior border 

 8.3 mm., of manus 5.0 mm., of movable finger 6.3 mm., of immovable 

 finger 3.7 mm., height of gape 2.3 mm. 



