coast of Cuba in the late 1940's (Bigelow and 

 Schroeder 1948); an adult female from Nassau in 

 1962 and an adult male from Cape Hatteras, 

 N.C., in 1963 (Fitch and Craig 1964). Bigelow and 

 Schroeder (1948) reported proportional mea- 

 surements from two individuals taken off Cuba; 

 Strasburg (1958) and Fitch and Craig (1964) re- 

 ported similar data from two Pacific specimens. 

 We report observations of A. superciliosus 

 taken on pelagic longlines aboard the commercial 

 fishing vessel Cap'n Bill III, in 1962, the RY Dol- 

 phin of the Sandy Hook Laboratory in 1966-69, 

 and the RV Gosnold of the Woods Hole Oceano- 

 graphic Institution in 1971. All previous evidence 



suggests A. superciliosus is not abundant any- 

 where in its range. However, our data, together 

 with anecdotal information from experienced 

 commercial longliners, show that concentrations 

 of bigeye threshers occur during April-June off 

 Cape Hatteras. Other sharks and teleosts occur- 

 ring in the area with A. superciliosus included 

 blue shark, Prionace glauca; short fin mako shark, 

 Isurus oxyrinchus; scalloped hammerhead, 

 Sphyrna lewini; bignose shark, Carcharhinus al- 

 timus; night shark, Hypoprion signatus; dusky 

 shark, C. obscurus; and silky shark, C falciformis , 

 along with swordfish, Xiphias gladius; and yel- 

 lowfin tuna, Thunnus albacares. Additional 



40* 



35* 



30* 



65« 



Number taken at each station 



z® 



_l L. 



40' 



35' 



-30' 



80* 



75* 



70' 



65' 



Figure l. — Location o{Alopias superciliosus longline catches in the western North Altantic. 



222 



