266 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



HEMIGRAPSUS CRENULATUS (Milne Edwards). 



Plate OS. 



Cyclof/rupsus crcnulatus MILNE EDWARDS, Hist. 

 Nat Crust., vol. 2, 1837, p. 80 (" habitcf" ; 

 type in Paris Mus.) 



Triclui(lacti/lu8 granurius NICOLET in Gay, Hist. 

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

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

 Paris Mus.). 



Hemigrapsus crcnulatus DANA, U. S. Expl. Exped., 

 vol. 13, Crust., pt. 1, 1S52, p. 349; atlas, 1S55, 

 pi. 22, fig. 3. 



TrlchodactyJus granulatus MILNE EDWARDS, Ann. 

 Sci. Nat., ser. 3, Zool., vol. 20, 1853, p. 210 

 [182]. Probably a lapsus pennae for T. 

 granarius. 



Lobograpsua crcnulatus A. MILNE EDWARDS, Ann. 

 Soc. Eutoiu., ser. 4, vol. 9, 1809, p. 173. 



tHctcrograpsus barbimanus CANO, Boll. Soc. Nat 

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

 Chiloe; not //. barbimanus Heller. 



Hctcrograpsus sanguincus LENZ (not Milne Ed- 

 wards), Zool. Jalirb., Suppl., vol. 5, 1902, p. 705. 



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 II. affinis; 

 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. 

 affinis; 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. 



