THE CANCROID CRABS OF AMERICA 365 



Relation. — Small specimens might be confused with P. hermudensis 

 but differ in the characters given in the diagnosis above. The chelae 

 approach those of P. rugosus but are less rough and hairy. 



Range. — Gulf of Mexico: Alabama, Louisiana, and Vera Cruz. 



Material examined. — 



ALABAMA. — Bayou la Batre; in stomach of Clangula clangula 

 americana; January 5, 1916; W. L. Bryant, U. S. Biological Survey; 

 1 right major chela, 7 mm. long (135077 A, Biol. Surv. collection). 



LOUISIANA. — Chandeleur Islands; L. R. Gary; 1 male holotype 

 (33106). 



MEXIGO.— Vera Gruz; Dr. T. B. WUson; 1 female (2526, Phila. 

 Acad.); labeled "Panopeus mexicanus Guerin," a manuscript name. 



PANOPEUS BOEKEI Rathbun 



Plate 167 



Panopeus hoekei Rathbttn, Proc. Biol. Soc. Washington, vol. 28, 1915, p. 118 

 (type-locality, Tumble-Down-Dick Bay, St. Eustatius; type in Leiden Mus.); 

 in Boeke, Rapport Visscherij Kolonie Curagao, pt. 2, 1920, p. 336 [20], text- 

 figs. 4 and 5; Bijdragen tot de Dierkunde, Amsterdam, vol. 23, 1924, p. 15. 



Diagnosis. — Four strong lateral teeth, the first two of typical 

 Panopeus being indistinguishably united. Front strongly deflexed. 

 Subhepatic tubercle undeveloped. Golor of immovable finger not 

 continued on hand. Dactyli of legs very slender. 



Description. — Garapace deeply areolated in anterior two-thirds, 

 areoles crossed by finely granulated rugae of which the principal are 

 transverse and simple on the epibranchial, pro togas trie, and epigastric 

 regions; the hepatic elevation is formed by several oblique rugae, and 

 forms a continuous arch with the protogastric ridge; surface covered 

 with scattered hairs of uneven length. Garapace convex in a longitu- 

 dinal as well as in a transverse direction, save for the four antero- 

 lateral teeth which are thickened and upturned; teeth well separated; 

 first tooth short and broad, outer margin convex or a little angled; 

 this tooth corresponds to the usual coalesced (first plus second) 

 tooth in Panopeus; three remaining teeth equally prominent and more 

 so than the first; second tooth as wide at base or nearly as wide as the 

 first, posterior margin convex, anterior straight or slightly concave, 

 tip blunt; third tooth similar in shape, but longer, narrower and 

 thicker; fourth tooth narrow, triangular, anterior margin nearly 

 transverse, tip acute, situated at widest part of carapace. Front bent 

 obliquely down from a transverse granulate line fringed with long 

 hair; edge of front divided by a V-shaped emargination into two well 

 rounded lobes, with a small independent lobule at outer end. Pre- 

 orbital angle prominent, blunt, a broad, nearly transverse, slightly 

 convex lobe between the two V fissures of the upper margin; a larger 

 V fissure below the outer angle; lower margin gradually advancing 

 up to base of inner tooth which is low and blunt. 



