78 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Material examined: 35 specimens from 14 Hancock expeditions 

 stations, all but two in the Gulf of California. (See Table 9) From 

 Puerto Refugio, Angel de la Guarda Island, to 1*4 miles southwest of 

 Cabeza Ballena, Gulf of California; Magdalena Bay, west coast of 

 Lower California, Mexico. 



Measurements: Largest specimen, a male: length 13.3 mm, width 

 10.5 mm, rostrum 1.0 mm, cheliped 14.7 mm, chela 6.5 mm, dactyl 

 3.9 mm, ambulatory legs 23, 21.5, 20, and 18 mm, respectively. Female: 

 length 10.8 mm, width 8.8 mm. 



Color in life: Not recorded. 



Habitat: Data regarding bottom type are available for 10 stations, 

 of which 7, or 70 per cent, were sand or sand with shell. Crane ( 1937, 

 p. 56) reports coarse sand with weed. 



Depth: Hancock expedition specimens were from 11-70 fathoms, 

 extending the previously known range of from 12-35 fathoms. 



Breeding: The three ovigerous female specimens were all taken in 

 March, no later collecting in the Gulf of California having been at- 

 tempted. 



Remarks: Although this species has been known almost since the 

 time of its discovery to occur on the west coast of Lower California at 

 Cedros Island as well as at Magdalena Bay, it was not encountered by 

 Hancock expeditions outside of the Gulf of California until 1949, when 

 specimens were obtained from the type locality. Previous to this date 

 all small inachine crabs of smooth carapace dredged on the Pacific side 

 of the peninsula were either the single-rostral spined Inachoides laevis 

 or the double-spined young of Collodes tenuirostris. The latter was 

 separated from C. tumidus by the characters mentioned under sup- 

 plementary descriptive notes for that species. The Hancock Foundation 

 series of C. tumidus is not as large as might be desired and contains no 

 male more mature than the specimen figured by Rathbun (1925, text- 

 fig. 47), so that it is impossible to say whether or not the chela illustrated 

 represents the maximum development attained by this species. 



Collodes robsonae, new species 

 Plate D, Figs. 1-6 ; Plate 4, Fig. 1 



Type: Female holotype, A.H.F. No. 397, from Venado, Canal Zone, 

 April 5, 1939, collected by students of Elinor D. Robson of Balboa, 

 Canal Zone. 



Measurements: Female holotype: length 29.6 mm, width 22.9 mm, 

 rostrum 1.7 mm, width 2.2 mm, cheliped 28.5 mm, chela 11.0 mm, 

 dactyl 6.8 mm, ambulatory legs 48, 51, 48, and 40 mm, respectively. 



