THE CANCROID CRABS OF AMERICA 147 



longer than broad, margins not incised, outer angle broadly rounded. 

 Chelipeds long, hand strongly compressed. Posterior feet natatory; 

 dactylus ovate. Dactylus of first 3 pairs broadly lanceolate. 

 Contains two species from middle America. 



KEY TO THE SPECIES OF THE GENUS EUPHYLAX 



A'. Antero-lateral margin of carapace armed with 5 small teeth or spines. Cara- 

 pace smooth dovii, p. 147. 



A'. Antero-lateral margin of carapace armed with 3 large spines and one small 

 one. Carapace with granulated lines and elevations robustus, p. 148. 



EUPHYLAX DOVU Stimpson 



Plate 65 



Euphylax dovii Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860, p. 226 

 [98], pi. 3 [not 5], figs. 5, 5a (type-locality, western coast of Central America; 

 type not extant). — A. Milne Edwards. Crust. Reg. Mex., 1879, p. 204, 

 pi. 38, figs. 2-2d. 



Diagnosis. — Five small teeth or spines on antero-lateral margin. 

 Carapace and lower orbital plate smooth. Front narrow, broadly 

 T-shaped. Eyes very long. Palms caripated. 



Description. — Carapace more than half again as broad as long-, 

 smooth and glabrous, minutely punctate, unevenly convex, cardiac 

 region more protuberant than gastric. Antero-lateral margin much 

 shorter than the postero-lateral, undulated and obscurely 5-toothed 

 including the angle of the orbit, which is much larger and more 

 prominent than either of the other teeth; posterior tooth minute, 

 subspinif orm ; intermediate ones very minute, indistinct and un- 

 equally distant. Margins of orbit crenulated; two small fissures 

 above. Suborbital lobe large and very prominent, with polished 

 superior surface; distance between its anterior and posterior margins 

 much exceeding mdth of eye-peduncle. Front nearly three times as 

 wide at its anterior extremity as at its base between the eyes; with 

 a supra-marginal crest interrupted at the middle. Chelipeds rather 

 large, nearly smooth above; merus broad, armed with 3 or 4 very 

 small spines anteriorly and one small terminal one posteriorly ; carpus 

 one-spined within, and with a crenulated outer margin usually 

 indistinctly one-toothed or spined; hands ornamented outside with 

 four slight longitudinal ridges sparsely granulated or short-spinulated, 

 besides the ridge on the upper and on the lower margin, iilso a superior 

 distal spine and a proximal spine at carpal articulation; on inner side 

 of palm a few elongated tubercles forming a short row along middle 

 of distal end, and above that and behind base of dactylus a spine with 

 one or two granules on its slope; fingers much compressed, not gaping, 

 strongly toothed within and with crenulated exterior margins. 



Color. — Rosy with zones of a deeper red on the front of the carapace 

 and on the arm. The shell has iridescent reflections which are very 

 apparent on inner face of chela. (A. Milne Edwards.) 



