DESCRIPTION OF A NEW ISOPOD OF THE (iENUS 

 J.EROPSIS FROM PATAGONIA. 



By Harriet Richardson, 

 CoUahorntor, Dirixion of Marine Tnrrrfrhratcs, U. >S'. Nationdl Afusrum. 



A species of Ja'ropsis, heretofore imdescribed, was collected by 

 Uie U. S. Bureau of Fisheries steamer Alhatroi^s 

 during its cruise off the east coast of Patagonia 

 in 1888. The list of species in this genus now 

 includes Ja'Topsis hrevicornis Koehler," •/. marl- 

 onis Beddard,^ /. curvicorms'' (Nicolet)/^ ./. 

 lohata Richardson," /. doUfusi Norman,^ ./, 

 rathhunm'J Richardson, and the present species. 



J^ROPSIS PATAGONIENSIS, new species. 



Body oblong-ovate, about two and two-thirds 

 times as long as wide. The lateral parts of the 

 thoracic segments are yellow. Most of the head 

 and most of the abdomen as well as the middle 

 of the dorsal region of the thorax is colored 

 reddish brown. 



The head is wider than long and has the post- 

 lateral angles rounded, the antero-lateral angles 

 acute. The anterior margin is produced on either 

 side of the median line in a small triangular proc- 

 ess. In the concavity formed between the two 

 is placed a small lobe, the anterior margin of j.TiRorsi.s r.vTAdoxiExsis. 

 which is produced in the middle in a small point. ^ ^^' 



The eyes are placed about halfway between the anterior and the 



"Ann. Sci. Nnt., (0), XIX, 1885, p. 7. 



» Challenger Report, XVII, 1S8G, p. 20. 



^ Stebbing has recently shown that J(cropsis ncn-zcnlnndirn Chilton is a syno- 

 nym of Jwroims curvicornifi (Nieolet). Ceylon I'earl Oyster Fisheries Re- 

 port, rt. 4. 1005. 1). 51. 



^ Historia cte Chile, III, 1849, p. 2G3, pi. 3, fig. 10. 



"Proc. IT. S. Nat. Miis., XXI, 1890, p. 857. 



^ Ann. Mag. Nat. Hist, (7), IV, -1899, p. 291, pi. 5, figs. 2-8. 



9 Trans. Conn. Acad. Sci., XI, 1902, p. 298, pi. 40, figs. 5.3-55. 



Proceedings U. S. National Museum, Vol. XXXVI— No. 1675. 



421 



