484 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



D'. Frontal lobes arcuate, finely denticulate marshi, p. 499. 



D2. Frontal lobes spinulous or spinous gracilipes, p. 499. 



B^. Antero-lateral spines or teeth five including the outer orbital one. 

 C. Outer surface of major palm partly smooth. 



D'. First two antero-lateral spines nearer together than the others, 

 sometimes united at base. Margins of front and orbit long- 



spined spinohirsutus, p. 503. 



D^. First two antero-lateral spines small. Margin of front granulate, 



of orbit spinulous at most miersii, p. 510. 



C^. Outer surface of major palm everywhere rough with spines or gran- 

 ules. 

 D'. Upper margin of orbit and margins of ambulatory legs un- 

 armed xantusii, p. 486. 



D*. Upper margin of orbit spined, ambulatory legs spinulous. 



gonzalensis, p. 505. 

 E'. Carapace largely flat. Front spined. 



E2. Carapace convex. Front granulate longleyi, p. 502. 



A*. Margin of frontal lobes distinctly oblique and concave, sometimes nearly 

 straight. 

 B'. Carapace one-half wider than long. A subhepatic tubercle present. 



Greater part of outer surface of major palm bare reticulatus, p. 521. 



C. Lateral teeth lobiform, flattened in a plane perpendicular to the 



dorsum ..reticulatus, typical, p. 522. 



C^. Lateral teeth with acute edge corresponding to marginal line of 



carapace reticulatus forma tessellata, p. 522. 



C^. Some of the tubercles of carapace and chelipeds stalked and flattened 



above, mushroom-like reticulatus forma fragosa. p. 522. 



B^ Carapace narrower. Both palms rough outside. 



C. Antero-lateral marginal spines small. No subhepatic tubercle or 



tooth stimpsonii, p. 624. 



C^. Marginal spines long; three at inner end of orbit curving over eye- 

 stalk. Subhepatic region covered with sharp granules. 



spinosissimus, p. 494. 



ANALOGOUS SPEOES OF PILUMNUS ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic Pacific 



sayi xantusii 



longleyi spinohirsutus 



holosericus limosus 



PILUMNUS SAYI Ralhbnn 



Plate 200, Figures 1 and 2; Plate 201, Figures 4-7 



Cancer aculeatus Say, Journ. Acad. Nat. Sci. Philadelphia, vol. 1, 1818, p. 449 

 (type-localities, Georgia and E. Florida; type not extant); not C. aculeatus 

 O. Fabricius, 1780, nor Herbst, 1790. 



niumnus aculeatus Gu^:rin-Meneville, Icon. Rcgne Anim. Cuvier, 1829 (?), 

 pi. 3, figs. 2-2c.— Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 420. — 

 A. Milne Edwards, Crust. R6g. Mex., 1880, p. 282, pi. 50, fig. 1-lc. 



Pilumnus sayi Rathbun, Ann. Inst. Jamaica, vol. 1, 1897, p. 15 (name sayi sub- 

 stituted for aculeatus preoccupied in Cancer). — A. Milne Edwards and 

 BouviER, Mem. Mus. Comp. Zool., vol. 47, 1923, p. 320. 



Diagnosis. — Four lateral marginal spines, two superhepatic spines. 

 Long spines of body and appendages black or dark brown, color 



