COLLETTE and RUSSO: SPANISH MACKERELS 



and can be detected easily in lateral view. The 

 temporal groove is the middle one and is deeper 

 than either of the other two. The remaining 

 groove, the supratemporal, is the largest of the 

 three and opens posteriorly between the supra- 

 occipital crest and the middle portion of the 

 epiotic. 



The interorbital and otic regions are not as 

 broad as in the more advanced genera of the 

 Sardini (Collette and Chao 1975) and Thunnini 

 (Gibbs and Collette 1967). The median and tem- 

 poral crests are higher in Scomberomorus than in 

 other scombrids. The bonitos, particularly Or- 

 cynopsis unicolor (Collette and Chao 1975:fig. 21), 



a 



FIGURE 13. — Skulls in dorsal view. a. Acanthocybium solandri, Caribbean Sea, 1,240 mm FL. b. Grammatorcynus 



bilineatus, Scott Reef, Timor Sea, 453 mm FL. 



563 



