1923] Rathbun, Brachyuran Crabs of West Coast of Mexico 623 



Micropanope nitida Rathbun 

 1898, Proc. U. S. Nat. Mus., XXI, p. 587, PL xlii, fig. 9. 

 Agua Verde Bay; April 1; 1 ^3 9 . 

 Locality not given; 23 c? 16 9 1 juv. 



Lophopanopeus heathii Rathbun 

 1900, Amer. Nat., XXXIV, p. 137. 



Middle of east side of Cerros Island; March 12; 1 c? and 

 carapace. 



Pilumnus spinohirsutus (Lockington) 

 Plate XXVII 



Acanthus spino-hirsutus Lockington, 1877, Proc. California Acad. Sci., VII, 1876 



pp. 33 and 102. 

 Pilumnus spino-hirsutus Streets and Kingsley, 1877, Bull. Essex Inst., IX, p. 107. 

 Pilumnus spinohirsutus Rathbun, 1904, 'Harriman Alaska Exped.,' X, p. 185 (part), 



not PL vn, fig. 2; 1910, Proc. U. S. Nat. Mus., XXXVIII, p. 585 (part). 



Point Abreoj os ; March 6; 1 d 71 . 



Magdalena Bay: Sail Rock, Entrada Point, S. 53° W.; Redondo 

 Point, S. 15° W.; lat. 24° 35' 20" N., long. Ill 59' 35" W.; 13.5 

 fathoms; S. brk. Sh.; March 21; station D5678 ; lcfl 9 2 juv. 



Occurs in southern California and on the west coast of Lower Cali- 

 fornia as far south as Magdalena Bay. 



From Magdalena Bay southward as far as Manzanillo, including the 

 Gulf of California, P. spinohirsutus is replaced by a form which I formerly 

 regarded as a variation, but a considerable series of both sorts from many 

 localities shows consistent differences. 



Lockington's types are not extant. His description would apply to 

 either species, according to the reader's interpretation of this sentence: 

 "... four larger spines on antero-lateral margin of carapax, besides 

 those on upper margin of orbit." Did he include the spine at the outer 

 angle of the orbit with the antero-lateral spines or with the upper orbital 

 spines? We can judge only by the locality of his specimens, San Diego, 

 which is included in the range of the northern species, and from which 

 the National Museum possesses two specimens belonging to that species. 

 In it, there are four antero-lateral spines beside the outer orbital spine; 

 the latter therefore was classed by Lockington with "those on upper 

 margin of orbit." 



The species have much in common. In both, the dorsal surface of 

 carapace and appendages is covered with long hairs, except the hinder 

 part of the carapace, while the carapace and ambulatory legs have a short 



