132 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Material examined: (See Table 22) 332 specimens from 106 stations, 

 of which 60 were in the Gulf of California. The remaining 46 stations 

 may be grouped as follows : Mexico south of Cape Corrientes, 5 ; Costa 

 Rica, 15; Panama, 14; Colombia, 6; Ecuador, 2; Revilla Gigedo 

 Islands, 2; Cocos Island, 2. For complete data concerning Galapagos 

 Islands specimens, of which an additional 26 from 12 stations were col- 

 lected by the Velero III, see Garth (1946, p. 367). Patos Island Anchor- 

 age, Gulf of California, Mexico, April 23, 1921, 4.5 fathoms, Fred 

 Baker, collector, 1 female (of 2 females identified by M. J. Rathbun) 

 (C.A.S.). 



Measurements: For ease in comparing a male and female of like 

 size, both specimens from Velero III station 571-36, Gulf of California, 

 the following table is presented. It will be seen that difference in total 

 lengths is compensated for by the greater rostral length of the male. 

 The much smaller dimensions of the female cheliped should also be noted. 

 Measurements are in millimeters. 



Color in life: Gulf of California specimens: Carapace always marked 

 with narrow vertical and oblique, alternate stripes of dark brown, white 

 and buff. Rostrum and all legs except chelipeds reddish-brown or dull 

 lavender mottled or barred with buff. Merus of chelipeds of adult male 

 pale buff, the palm and fingers olive; merus of chelipeds of female and 

 young like other legs, the palm and fingers bright orange. Carapace 

 coloration of young like that of adult, except that the body stripes are 

 much paler, the dark brown of grown specimens being faint tan. Eggs 

 deep cream. (Crane) (Cf. Garth, 1946, p. 367) 



Habitat: Analysis of station data shows that in about 40 per cent of 

 the cases Stenorynchus debilis was dredged from sand bottom, associated 

 with shell and rock to a minor extent. In 20 per cent of the cases rock 

 was the dominant substrate, with sand and nullipores occasionally present. 



