ART. 33. NOTES ON FISHES OF HAWAII E. K. JORDAN 17 



from Carangoides ferdau by the numbers of rays (D. 20; A. 16, 

 instead of D. 23, A. 19) and by its dusky colors, the sides always 

 with a few rather large irregular bronze spots ; pectorals pale, other 

 fins mostly dusky. The species needs comparison with others of the 

 same genus found in the East Indies. 



CARANGOIDES DASSON (Jordan and Evermann). 



This species, with the teeth all villiform, should be p)laced in 

 Carangoides (not Caranx). 



Genus HYNNIS Cuvier 



HYNNIS AJAX (Snyder). 



The very large fish, described by Snyder as Carangoides ajax and 

 figured by Jordan and Evermann, belongs to the group called Hynnis 

 Cuvier and Valenciennes, which differs from the earlier genus 

 Scyris Cuvier only in the lack of filiform rays in the second dorsal, 

 perhaps a matter of age. Hynnis ajax is close to Hynnis liofkinsi 

 Jordan and Starks, from Mazatlan, differing mainly in the rather 

 more slender form. A single example 3 feet long was seen in the 

 Honolulu market, but not taken. It would be interesting to know 

 the changes with age in this species. Except for the much more 

 elongate form of the body and the lack of produced rays in the 

 known examples, Hynnis scarcely differs from Alectis. But the 

 type specimens of each of the known species of Hynnis {goreensis, 

 the type of the genus, cuhensis, hopkin^i, and ajax) were 2 to 3 feet 

 in length. In none is there any trace of spinous dorsal, or of fila- 

 ments on the fins. 



But the filaments disappear in very old examples of Alectis ciliaris, 

 as sometimes seen in the market of Honolulu, one such having been 

 sent by us to the American Museum. Alectis has, however, the body 

 much deeper, at all ages, than in Hynnis (2% to 3 in Hynnis, IVs 

 to 2 in Alectis, 2% in the type of Scyris). 



To avoid changing a doubtful opinion for another, I retain the 

 name Hynnis for this genus though it may eventually be merged 

 in Scyris, or both in Alectis. 



In Fowler's supplementary list he records '•''Scyris indica Riip- 

 pell " which corresponds to the form just mentioned as the probable 

 adult of Alectis ciliaris, the depth 2 in length. Hynnis ajax has the 

 depth about 3 in length, and no black spot on the upper angle of 

 the opercle, a trait which appears in all or nearly all the fishes 

 referred to Alectis and Scyris. 



Hynnis may be characterized as follows: Head naked; body 

 rather elongate, the depth about one-third length, naked except for 

 an area along lateral line with smooth imbedded scales; profile of 

 head convex; mouth moderate, with villiform teeth on jaws, vomer, 



44916—25 3 



