CALIFORNIA STALK-EYED CRUSTACEA. 173 



Crangon nigromaculata Lock. 



Crangon nigromaculata LOCKINGTON, Proc. Cal. Acad. Sci., Vol. VII, 1877, 



p. 34. 

 Crangon nigricauda STREETS and KINGSLEY, Bull. Essex Inst., Vol. IX, 



1877, p. 108. KINGSLEY, Bull. Essex Inst,, Vol. X, 1878, p. 54. 



LOCKINGTON, Ibid., Vol. X, 1878, p. 159. 

 Crangon vulgaris SMITH, Rep. Prog. Geol. Sur. Canada, 1878-9, B, p. 212. 



KINGSLEY, Bull. Essex Inst., Vol. XIV, 1882, p. 129. 

 Crangon crangon affinis ORTMANN, Proc. Acad. Nat. Sci. Phila., 1895, p. 



180. 



Closely allied to nigricauda, but possessing the following distinguish- 

 ing marks. It attains a considerably larger size, the rostrum is generally 

 more nearly acute; the antennal scale is narrower and longer, being three- 

 fourths the length of the carapace and subequal to the telson; the hand is 

 a little longer, with the anterior margin more nearly transverse; the ante- 

 penultimate abdominal segment is rounded (not carinated) above; the telson 

 is acute at the tip, rounded above, and equaling (often slightly exceeding) 

 the uropods, which are narrower than in nigricauda. The most charac- 

 teristic and striking mark on this species is a large, colored spot on each 

 side of the sixth abdominal segment. This spot has a bluish center sur- 

 rounded by a bladk ring, outside of which is another ring of a yellowish 

 color. The sides of the preceding abdominal segments are marked with 

 small, yellow spots. The chelipeds generally reach but little beyond the 

 middle of the antennal acicle. In none of the specimens examined did 

 they reach to the tip. With the exception of these differences this species 

 agrees with nigricauda in all the characters mentioned in describing that 

 form. 



Although this species was regarded as a " color 

 variety" of nigricauda by Kingsley and subsequently 

 ranked as a synonym of that species by its own author, 1 

 I am convinced that it should be restored to its rank as 

 a distinct species. I have collected large numbers of 

 nigricauda and nigromaculata from various localities on 

 the coast of California, and have compared numerous 

 specimens of both sexes and of all ages with consider- 

 able care. The large color mark on the sixth abdominal 

 segment appears to be an absolutely constant character; 



1 Bull. Essex Inst., Vol. X, p. 159. 



