/. 



1898.] RICHARDSON — FOUR NEW SPECIES OF ROCINELA. 11 



//. Spots present on both sides of the fourth 



thoracic segment 



7?. viaculata Schioedte and Meinert. 

 //. Spots wanting on fourth thoracic segment. 

 i. Spots present on fourth and fifth abdominal 

 segment and base of terminal segment. . 

 R. alaskensis'^ (Lockington). 

 /'. Spots wanting on fourth and fifth abdominal 

 segments and terminal segment .... 

 R. a7nericana Schioedte and Meinert. 

 Terminal segment of body subtriangular ; branches 

 of uropods not crenulate on their exterior 

 margins . R. orientalis Schioedte and Meinert. 

 d'. Propodus of prehensile legs with five or six spines. 



e. Increase in breadth of abdomen from base to fourth 



segment R- laticauda Hansen. 



/. No increase in breadth of abdomen from base to fourth 

 segment . . , R. aiLstralis Schioedte and Meinert. 

 b' . Flagellum of second pair of antennae with ten or eleven joints. 

 c. Tubercles developed on all the segments of the body . . . 



R, tuberculosa, sp. nov. 

 c' . No tubercles developed on body. 



d. Terminal segment of body ornamented with a pair of 

 narrow semi-lunar bands separated by a longitudinal 



stripe R- signata Schioedte and Meinert. 



d'. Terminal segment of body ornamented with a very wide 

 crescentiforrn band, from whose posterior border 

 three large hastiform stripes project backwards. 



R. aries Schioedte and Meinert. 



^ga belUceps Stimpson {^Proc. Ac. Nat. Sci., Philadelphia, 

 1864, xvi, p. 15s) J is also undoubtedly a Rocinela and may even 

 prove to be identical with Rocifiela alaskensis (Lockington) in which 

 case the proper name will be Rocinela belliccps. 



^ALga alaskensis Lockington {Froc. Cal. Academy of Sciences, 1876, Vol. vii, 

 PI. i, p. 46, 1877) must be referred to the genus Rocinela, as it agrees in every 

 respect with the characteristics of that genus. When identifying yEga alasken- 

 sis Lockington with Rocinela, I found in conversation with Dr. Benedict that 

 he had already recognized this relation. 



