1879.] 159 (Kingsley. 
in the relative widths of front and carapax; there is also a variation 
in the ornamentation of the carapax; in some the cardiac region is 
smooth, in others crossed by elevated ridges. It would thus seem 
proper to unite these two forms, especially since Saussure says in the 
closing paragraph of his description of Metopograpsus dubius, “Je ne 
connais pas suflisamment bien les rapports de différence qui séparent 
les crustacés assez rares de se genre pour oser rien formuler de précis 
quant a cette espece, qui je serais enclin 4 considérer comme le femelle 
du M. miniatus, sans ’extréme largeur de son front et la forme bien 
différente de sa carapace.”’ 
Pachygrapsus gracilis Stimpson. 
Metopograpsus gracilis Saussure, J. c., p. 27, pl. u, f. 15 (1858). 
Pachygrapsus gracilis Stimpson, Annals N. Y. Lyc., x, 113 (1871). 
This species is readily separated from the preceding by the follow- 
ing characters. Cardiac region without transverse elevated lines, 
supra-frontal lobes nearly obsolete; front regularly arcuate, making 
an angle of about one hundred and twenty degrees with the inner 
margin of the orbit, and viewed from in front nearly horizontal; in- 
ferior margin of orbit not making an angle with the external orbital 
tooth; lateral margin nearly straight; meros of external maxilliped 
a half broader than long. The upper margin of the dactyli of the 
chelipeds and lower margins of the hand are denticulated; the 
carapax is narrower and more convex than in P. transversus. There 
appears also the following difference in alcoholic specimens. In 
P. transversus there are irregular patches of darker color on the 
carapax and hands, while in P. gracilis there are minute specks of 
black on the same portions. 
LEUCOSOIDEA. 
Family CALAPPID. Sub-Family CALAPPINZ. 
Genus CALAPPA Fabr. 
Calappa convexa Saussure. 
Calappa convexa Saussure, Revue et Magazin de Zoologie, v, pl. 
xu, f. 3, (1853); Stimpson, Boston Journal Nat. Hist., v1, 470, 
(1857); ibid, Annals N. Y. Lyceum Nat. Hist., x, 114, 1871. Ca- 
lappa xantusiana Stm., Ann. N. Y. Lyc., vit, 237, (1860). 
A large male of this species from Panama (J. H. Sternberg) gives 
the following measurements. 
Length of carapax, 55 mm.; breadth, 83 mm.; ratio, 1: 1.51. 
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