54 



PROCEEDINGS OF THE NATIONAL IMUSEUM 



mi. from mouth of Rio Colorado, Baja California. Panama: USNM 

 190591 (2), Panama Bay, 1-3 mi. SE of Isla Taboga and 2-4 mi. from 

 Rio Pacora; CJCLA 53-275 (3), Panama Bay, between Panama City 

 and Punta Gorda; UCLA 58-305 (1), Panama Bay, offshore between 

 Rio Chico and Punta de la Plata; FMNH 62438 (2), Punta Chame and 

 Punta Anton, Panama Bay; SU 11584 (holotype of Sphyrna vesper- 

 tina), Panama City; SU 11881 (one paratype of S. vespertina) , Panama 

 City; MCZ 80 (1), MCZ 516 (1), no further data. 



Diagnosis. — Sphyrna tiburo vespertina differs from S. tiburo tiburo 

 in having a slightly broader and more pointed head. These differences 

 are illustrated in figures 12 and 13. 



9 ^ 



< < 

 111 <n 



X 3 



300 350 400 450 500 550 600 650 700 750 800 850 900 950 



Figure 13. — 



Comparison of head width in the two subspecies of Sphyrna tihuro. (Figure by- 

 Paul Laessle.) 



Sphyrna (Platysqualus) media Springer 



Figures 14, 15, 16, 17, 21 /, g, 22/; Plate 7c 

 Sphyrna tudes (misidentification) Jordan, 1895, p. 383. (Mazatldn, Sinaloa.) 

 Cestracion tudes (misidentification) Meek and Hildebrand, 1923, p. 59. (Colon, 



Panama.) 

 ?Sphyrna tiburo (misidentification) Kuniada and Hiyama, 1937, p. 17. (Descrip- 

 tion could apply to either S. tiburo, S. media, or jS. corona; illustration is either 

 of S. media or S. corona.) 

 Sphyrna media Springer, 1940a, pp. 161-169. (Original description; illustration of 

 head; holotype, a partially defleshed 900 mm. male, SU 11583; type locality, 

 Mazatldn, Sinaloa, Mexico; one paratype, a 745 mm. female, USNM 28160, 

 from Mazatldn.) 

 Sphyrna nana Sadowsky, 1965, pp. 1-12. (Original description; illustrations of 

 head and body; holotype, a 1,330 mm. female, Sao Paulo Zoological Museum 

 [P0B]7172; type locaUty, off Cananeia, Brazil [lat. 25° S., long. 47°52' W.].) 



Specimens examined. — (Range in size: 337-900 mm. TL; heads 

 of larger specimens also examined; estimated length of largest, ca. 

 1025 mm.). Atlantic Ocean (including Caribbean Sea): Brazil: SU 

 52716 (head only), Vitoria. Panama: MCZ 500 (1), USNM 79284 

 (1), Colon market. 



