THE GRAPSOID CRABS OF AMERICA. 245 



Leptof/rapsits rugulosuft MILNE EDWARDS, Ann. Sci. Nat., ser. 3, Zool., vol. 



20, 1853, p. 172 [138], (type-locality, Brazil; type in Paris Mus.). 

 Pachygrapsus laeviwanus STIMPSON, Proc. Acad. Nat. Sci. Philadelphia, vol. 



10, 1858, p. 102 [48], (type-locality, in portu Jacksoni vel Sydney 



Australiae; type not extant). 

 Metopograpsus dubius SAUSSURE, M6m. Soc. Phys. Hist. Nat. Genfive, vol. 



14, 1858, p. 445 [29], pi. 2, fig. 16 (type-locality, St. Thomas; type In 



Geneva Mus.). 

 Metopograpsus miniatus SAUSSURE, Me"m. Soc. Phys. Hist. Nat. Gen&ve, vol. 



14, 1858, p. 444 [28], pi. 2, fig. 17 (type-locality, St. Thomas; type in 



Geneva Mus. ; its sides are distended by a parasite, one side more than 



the other). 

 Grapsus declivifrons HELLER, Verb. k. k. zool.-bot. Ges.*, Wien, vol. 12, 1862, 



p. 521 (type-locality, Rio Janeiro; type in Vienna Mus.). 

 Pachygrapsus intermedius HELLER, Crust. Reise Novara, 1865, p. 44 (type- 

 locality, Rio Janeiro; type in Vienna Mus.). 

 Pachyyrapsus socius STIMPSON, Ann. Lye. Nat. Hist. New York, vol. 10, 



1871, p. 114 (type-localities, Peru, Panama, San Salvador, Manzanillo, 



and Cape St. Lucas ; cotypes from Cape St. Lucas and Panama in 



Mus. Comp. Zool.). 

 Pachygrapsus advcna CATTA, Ann. Sci. Nat., ser. 6, Zool., vol. 3, 1876, p. 7, 



pi. 1, fig. 1 (type-locality, Marseille on vessel from Pondichery, by way 



of Cape of Good Hope; type probably not extant). 



Diagnosis. One side tooth. Sides strongly convergent. Front 

 sinuous. Upper edge of movable finger smooth. Merus of last leg 

 dentate at posterior distal end. 



Description. A small species. Carapace one-third broader than 

 long, covered with oblique and transverse striae, the latter being short 

 and faint on the cardiac and intestinal regions, and granulated on the 

 anterior half of the carapace; intervening space granulate; sides 

 slightly arched, strongly convergent posteriorly, armed with an acu- 

 minate tooth close behind the similar but larger outer orbital tooth. 



Front slightly more than half as wide as carapace, edge sinuous 

 and granulate, with three shallow sinuses, sides little oblique, surface 

 smooth, except a transverse granulate line on each of the two mar- 

 ginal lobes. The superior frontal lobes of the middle pair are promi- 

 nent, outer pair oblique, flattened. 



Orbits oblique, about two-fifths the width of the front, lower 

 border denticulate. 



Chelipeds equal, much stouter than the legs, in the male one 

 and two-thirds times as long as the carapace; arm and wrist, 

 and also the merus joints of the legs, transversely striated. 

 Inner margin of arm produced in a laminate expansion, denticulate 

 on the edge, and distally laciniate. Carpal tooth blunt. Chela finely 

 granulate; upper surface of palm with a marginal line, and obliquo 

 striae on the inner side ; lower surface obliquely striated ; an obliquely 

 longitudinal line on the outer surface near the lower edge, runs the 

 length of the propodus. Palm one and one-half times as high as its 



