364 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 

 PANOPEUS TURGIDUS, new species 



Plate 166 



Type-locality. — Chandeleur Islands, Louisiana; L. R. Gary col- 

 lector; male holotype, Cat. No. 33106, U.S.N. M. 



Diagnosis. — Carapace suboval. Front thick, not grooved. Proto- 

 gastric striae oblique. Male abdomen broad, third segment drawn 

 to a point at each side, sixth segment much broader than long. 



Description. — Carapace suboval, swollen in the middle, subdivisions 

 of gastric region almost obliterated; surface little roughened with 

 the exception of the granulate lateral and anterior regions and a 

 few raised granulate hnes as follows: One epibranchial, nearly 

 transverse and slightly in advance of a transverse metagastric line 

 which is interrupted in the middle; a pair of protogastric lines on 

 each side, parallel and distinctly oblique, inclined backward and out- 

 ward; a fainter hepatic line, either sinuous or broken. Epigastric 

 lobes swollen. Front Httle advanced, edge thick but not guttered, 

 very slightly convex, median emargination minute, not continued 

 by a closed fissure, outer ends not forming teeth or lobes. Anterior 

 margin of preorbital lobe transverse. Supra-orbital emarginations 

 faint, followed by closed fissures, of which the inner is much longer 

 than the outer, edge between them slightly arched. Suborbital 

 emargination of good size, followed by a transverse margin and a 

 short, broad, blunt, inner tooth; subhepatic tubercle low and obso- 

 lescent. First antero-lateral (or orbital) tooth small, separated by a 

 shallow sinus from the low, broad, second tooth. Three remaining 

 teeth acutely pointed, third and fourth with convex outer margins 

 curving forward, last tooth short-triangular. 



Chelipeds very unequal (the minor one may be subnormal), very 

 rough in their dorsal aspect. Merus with a prominent, sharp, 

 subdistal tooth. Carpus with reticulated granulation, a deep distal 

 groove and a sharp inner tooth. Hands suboblong, with a superior 

 groove. Fingers of major chela, as well as of minor, long and narrow, 

 their teeth reduced in size. Color of .immovable finger continued a 

 little on palm and limited by a line extending from the basal end of 

 the prehensile edge obliquely downward to lower margin. 



Third segment of male abdomen tapering to a point at either end, 

 sixth segment much broader than long. 



Female. — A female from Vera Cruz is larger but its characters are 

 less pronounced than in the male, the lines on the carapace less 

 prominent, the color of the immovable fingers not extended to the 

 palm. 



Measurements. — Male holotype, length of carapace 14, width of 

 same 19.3, fronto-orbital width 11.6, width of front 6.4 mm. Female, 

 Vera Cruz, length of carapace 17.3, width of same 24.4 mm. 



