266 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



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HEMIGRAPSUS CRENULATUS (Milne Edwards). 



Plate CS. 



Cyclograpstis crcnnlattis Milne Edwards, Hist. 

 Nat. Crust., vol. 2, 1837, p. 80 {" halite?" ; 

 type in Paris Mus.) 



Tnchodactylus t/ranurius Nicolet in Gay, Hist. 

 Chile, Zool., vol. 3, 1849, p. 151 ; atlas, vol. 2, 

 pi. 1, fig. 3 (type-locality, Chile; cotypes in 

 Paris Mus.). 



Ecmigrapsiis crcnulatus Dana, U. S. Expl. Exped., 

 vol. 13, Crust., pt. 1. 1852, p. 349; atlas, 1S55, 

 pi. 22, fig. 3. 



Trichodactylus (jranulaUis Milne Edwards, Ann. 

 Sci. Nat., ser. 3, Zool., vol. 20, 1S53, p. 216 

 [182]. Probably a lapsus pennae for T. 

 granarius. 



Lohograpsns crcnulatus A. Milne Edwards, Ann. 

 Soc. l^ntom., ser. 4, vol. 9, ISGO, p. 173. 



fllatcrograpsus Mrhimanus Cano, Boll. Soc. Nat. 

 Napoli, ser. 1, vol. 3, 1889, pp. 99 and 243, 

 Chiloe; not H. harhiinanus Heller. 



Hetcrograpsus sanguineus Lenz (not Milne Ed- 

 wards) , Zool. Jahrb., Suppl., vol. 5, 1002, p. 7G5. 



Diagnosis. — Two side teeth. Sides converg- 

 ing behind. Chela of male hairy inside. Legs 

 with thick fringes of hair. 



Description. — Of medium size; carapace sen- 

 sibly broader than long; antero-lateral margins 

 more strongly curved than in" //. afpnis; 

 postero-lateral margins strongly convergent; 

 flat behind, sloping down on front and sides; 

 cardiac and posterior gastric regions well de- 

 fined; surface covered with coarse, close-set 

 granules, except posteriorly where they are re- 

 placed by punctae connected by fine impressed 

 lines. Two notches in the lateral margin (the 

 anterior the larger) form two acute teeth which 

 are not prominent; interval equal to that be- 

 tween the first and the orbital angle, which is 

 nearly a right angle. The oblique branchial 

 ridge is considerably behind the last tooth and 

 is more longitudinal in direction than in H. 

 af^nis; ridge above the last two legs short and 

 sinuous. 



Front two-fifths as wide as carapace, very 

 slightly arched. 



Basal joint of antenna very broad, with an 

 outer lobe; not filling the orbital hiatus. 



