352 BULLETIN 97, UNITED STATES NAllONAL MUSEUM. 



A*. Merus of inaxilliped with an Inner distal emarfii nation. 



B\ Emargination of merus of niaxilliped very sliallow, rounded, not at all 



V-sliaped lateralis, p. 355. 



H*. Emargination of merus of maxllliped V-shaped, sonietimes continued 

 bacliward by a closed fissure. 

 C\ Antero-external angle of nierus of maxilliped strongly produced beyond 



tlie emargination and fissure on the inner margin lagostoma.i^.SQX. 



(3*. Antero-external angle of merus of maxilliped not produced much bejoud 

 antero-internal angle plantitiix. p. SHO. 



ANALOGOUS SPECIES 0?f OPPOSITE SIDES OF THE CONTINENT. 



Atlantic. Paclflc. 



fttficold 1 



,. ' I quadratus (also on the Atlantic side of the Isthmus), 



lateralis. J 



SPECIES EKBONEOUSLY UKFEUUED TO THE GENUS GECABCINUS. 



Gecarcinus barbigcr Poeppig 183(}= Paraxantlms barbiger (Poeppig). 

 Gecarcinus rcgius Poeppig ISSQ—Homalaspis plana (Milne Edwards. 1834). 



GECARCINUS RURICOLA (Linnaeus). 



HLACK OK MOUNTAIN CRAB; BLUE LAND-CRAB; RED TOURLOUKOU. 



Phites 117 iiiid 118. 



Cancer terrestris cuniculos sub terra agents Slo.mve, Voy. .lamalca. vol. 1, 

 1707, pi. 2 ; vol. 2, 1725. p. 269 ; Jamaica. 



Cancer Hulcatus, terrestris, sire montanus, Americanus Seba, Thef^aurus, 

 vol. 3, 1758, p. 51, pi. 20, fig. 5; Curassoa. 



Cancer ruricola Linnaeus, Syst. Nat., ed. 10, vol. 1, 1758, p. 626 (type- 

 locality, America ; type not extant). — Herbst, Natur. Krabben u. Krebse, 

 vol. 1, 1783, p. 119, pi. 3, tig. 36, copied; pi. 4. fig. 37, copied; 1790, 

 p. 2G2, pi. 20, fig. 116; vol. 3. 1799, p. 37, pi. 49, fig. 1.— Browne. Hist. 

 Jamaica, index 3, 1789 (reference to p. 423). 



Cangrejos Ajaes Terrcstrcs Parka, Descripcion de diferentes piezas de 

 Historia Natural, Havana, 1787, p. 164. pi. 58 (color varieties). 



Ocypode tourlourou Latreii.le, Hist. Nat. Crust., vol. 6, 1803, p. 36 (tyi)e- 

 locality, Santo Domingo; type in Paris Mus.). 



Gecarcimis ruricola- Leach, Trans. Linn. Soc. London, vol. 11, 1815, p. 322. 



Ocypoda rubra Freminville, Ann. Sci. Nat., ser. 2, Zool., vol. 3, 1835. p. 222 

 (type-locality Antilles; type in Paris Mus.). 



Gecarcinus agricola Reiohenrach, Zoologie oder Naturgescbichte des 

 Thierreichs, vol. 2, 1836 (Zittau und Leipzig), p. 280; South America 

 and Antilles. 



Diagnosis. — Large. Froiito-orbital width much more than one- 

 third width of carapace. Maxillipeds cover epistome and antennu- 

 lar cavities; merus suboval, subentire. Chelipeds equal. Dactyli 

 of legs with six rows of spines. 



Description. — Branchial regions greatly swollen sideways. Cer- 

 vical suture very deep, ending anteriorly in a pit near the orbital 

 angle. Equally deep is the median suture which runs nearly a third 

 the length of the carapace; cardiac region less deeply outlined. 



