364 THE GENUS PANOPEUS BENEDICT AND EATHBUN. 



Panopeus sayi is so closely related to texanus that any description 

 is necessarily comparative. The frontal margin of sayi is depressed, 

 while that of texanus is horizontal or nearly so. In specimens of equal 

 size the abdomen is narrower at the terminal segment in sayi^ and the 

 constriction at the articulation of the anchylosed and penultimate seg- 

 ments is less in sayi. With a little experience one could separate the 

 two species on the character of the surface of the chelipeds. In many 

 specimens of sayi the chelipeds are marked with irregular lines of color 

 corresponding to very small oblong depressions between which the sur- 

 face is minutely granulated au<l scattered with punctures. The chelipeds 

 of texanus are covered with very minute granules and with thinly 

 scattered i)uuctures. To the naked eye the surface appears glabrous. 

 In sayi the color of the fingers in the male ranges from black to 

 horn color, and runs upon the hand both inside and out to a variable 

 extent (PI. xxiii, tigs. 7 and 8). In the females the fingers are horn 

 color, which is often restricted, much as in texanus, but in this species 

 the females can readily be distinguished by the antero-lateral teeth, 

 which are sharper and more produced. The ambulatory feet are rela- 

 tively much shorter in sayi than in texanus- This is most noticeable 

 in comparing the dactyls of the fourth and fifth i:)airs of feet (PI. xxii, 

 figs. 4 and 5). 



Length of carapace in large specimen, 17 millimetres; width, 22.5 

 millimetres. 



After a critical examination of over five hundred specimens of sayi 

 and over two hundred and fifty of texanus we regard the two species 

 as altogether distinct, as they can be separated by several different 

 characters. On the coast of South Carolina, a region intermediate be- 

 tween Cape Cod, the well-known habitat of sayi, and the Florida coast, 

 where all our specimens of texanus were obtained, large numbers of 

 Fanopeus have recently been collected, none of which present any grada- 

 tions between sayi and texanus, but all are identical with the northern 

 form. 



RECORD OF SPECIMENS EXAMINED. 



Massachusetts: Weimeet(8001) ; Provincetown (3005, 3827) ; off Falmouth (13843); 

 Vineyard Sonnd, low water to 9 fathoms ; Wood's HoU (3214, 15662) ; Buzzard's Bay, 

 5 to 8 fathoms ; Mattapoisett Harbor (5782). 



Long Island Sound, U. S. Fish Commission: Gardiner's Bay (15752); New Haven 

 Harbor, on oyster beds (4162) ; otfMilford, Stratford, and Bridj^eport, on oyster beds. 



New Jersey: Beesley's Point (Yale Univ. Mus.). 



Virginia: Mouth of Indian River, Chesapeake Bay, on iron buoy (15618); York 

 River, Chesapeake Bay, on wooden buoy (13847); Hampton Roads, 12 fathoms 

 (12453). 



North Carolina: Fort Macon (Yale Univ. Mus.)- 



South Carolina, U. S. Fish Commission, 1890-1891: Winyah Bay (15689); Clain- 

 bank Creek (15703); Bulls Bay (1.5777); Coosaw River (15771); Myrtle Bush Creek 

 (15769); Jericho Creek (15783); nearPortRoy.il (15729); one mile inside of May River 

 (1.5731); west end of Skull Creek (15738); i5iill Creek a5721, 157.34); Calibogue 

 Sound (15773). 



