456 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 

 RHITHROPANOPEUS HARRISn (Gould) 



Plate 183, Figures 7 and 8 



Pilumnus harrisii Gould, Rept. Invert. Massachusetts, 1841, p. 326 (type- 

 localities, Cambridge marshes and clinging to floating seaweed in Charles 

 River; types not extant). 



Panopeus wurdemannii Gibbes, Proc. Amer. Assoc. Adv. Sci., vol. 3, 1850, p. 176 

 [\2\ (type-locality, Enterprize, Fla. (cotypes. Cat. No. 16157, U.S.N.M., 

 and in Charleston Mus.). — Leidy, Journ. Acad. Nat. Sci. Philadelphia, ser. 

 2, vol. 3, 1855, p. 17. Not P. wurdemannii Benedict and Rathbun, 1891. 



Panopeus harrisii Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, p. 55 

 [9]. — Benedict and Rathbun, Proc. U. S. Nat. Mus., vol. 14, 1891, p. 378, 

 pi. 21, fig. 2; pi. 24, fig. 16. 



Rhithropanopeus harrisii Rathbun, Bull. Labor. Nat. Hist. State Univ. Iowa, vol. 

 4. 1898. D. 273. 



Diagnosis. — Front truncate; dorsal ridges prominent. First two 

 antero-lateral teeth fused, last three dentiform. Legs slender. 



Description. — Two transverse lines of granides on each protogastric 

 region, one on mesogastric region interrupted at middle, two branchial, 

 one of which is opposite the tip of the posterior lateral tooth. Front 

 little produced, edge nearly straight, channeled, upper and lower 

 margins granulate; median notch triangular. Lateral teeth not 

 prominent; a sinus in coalesced tooth; third and foiu"th teeth pointing 

 obhquely forward; last tooth smaller. Outer orbital hiatus a nearly 

 closed fissure opening on a broad shallow notch. No subhepatic 

 tubercle. 



In the old the cheUpeds are nearly smooth. In small specimens the 

 wrist is rough with lines and bunches of granules, distal groove deep; 

 two granulate ridges on upper margin of palm; upper edge of fingers 

 granulate. Fingers slender, prehensile edges evenly dentate. Legs 

 long, slender, compressed. 



The third segment of the male abdomen does not touch the coxae 

 of the last pair of legs; terminal segment subquadrate. 



Color. — Brownish, paler below; fingers white. Yellow with red 

 spots (18501). 



Measurements. — Male (3149), length of carapace 14.3, width of same 

 19.4 mm. 



Habitat. — In brackish or fresh water. Local. 



Range. — From Miramichi estuary. New Brunswick (Connolly), to 

 Mexico. 



Material examined. — ' 



MAINE. — Sheepscot; from among oysters growing in Sheepscot 

 River; November 5, 1902; W. C. Kendall; 8 specimens (28783). 



CONNECTICUT.— East side New Haven Harbor; September, 

 1892; James E. Benedict; 20 specimens (18194). 



NEW YORK.— Creek near West Point, Hudson River; Dr. E. A. 

 Mearns, U. S. Army; 6 females, 1 young (19632). 



