PART 1 GARTH ! PACIFIC OXYRHYNCHA 89 



Material examined: A total of 682 specimens from 118 stations or 

 unnumbered localities, of which 29 were in the Gulf of California. 

 Of this number 102 specimens from 11 Gulf of California stations may 

 be designated as subspecies Pyromaia tuberculata mexicana. (See Table 

 11) From Tomales Bay, Marin County, California, to off Cape Cor- 

 rientes, Colombia, including the entire Gulf of California. In addition 

 to the above, one male specimen from San Bartolome Bay, Lower Cali- 

 fornia, Mexico, December 16, 1916, surface haul with lampara net [?], 

 Albatross (C.A.S.), and one female specimen from Utria Bay, Colombia, 

 Askoy expedition (Garth, 1948). 



Measurements: Comparative measurements of specimens of like sex 

 and size are arranged in tabular form to emphasize the difference in 

 proportion between typical Pyromaia tuberculata and P. t. mexicana. 

 (Measurements in mm.) 



P. tuberculata P. t. mexicana 

 Male 



Length of carapace, including rostrum 15.7 



Length of rostrum 



Width of rostrum 



Length of carapace without rostrum 



Width of carapace 



Length of cheliped 



Length of chela 



Length of dactyl 



First walking leg 



Second walking leg 



Third walking leg 



Fourth walking leg 

 It will be noted that the principal difference lies in the length of the 

 rostrum, and that when this is subtracted from total length the disparity 

 in size of the two specimens increases. However, P. t. mexicana continues 

 to exhibit the greater proportional width to length. 



The figure used to illustrate the species by Rathbun (1904; 1925, 

 pi. 218) and by Schmitt ( 1921 ) is that of the male holotype of Neorhyn- 

 chus mexicanus, and as such does not represent the typical form that 

 occurs off California and the west coast of Lower California. (See PI. 6, 



% 1) 



Color in life: Not recorded. Boone (1930a, p. 76) reports of Ara 

 specimens (as Collodes granosus Stimpson) : "rich creamy yellow; eyes 

 black," which is customary for specimens in alcohol. 



