57. SCOMBERESOCID.cE HALOCYPSELUS. 
377 
fins not scaly. Caudal moderately forked, the middle rays being twice 
the length of the eye. Pectorals shorter than liostorbital part of 
head. Ventrals a little shorter. Back broad. Head (with lower 
jaw) 2§. D. 14; A. 14; Lat. 1. 63. Southern California, not very 
common. 
(Jordan & Gilbert, Proc. U. S. Nat. Mus. 1880, 335.) 
aa. Pectoral fins very long; ventrals very short ; body very slender. (Euleptorham- 
plais"* Gill.) 
605. II, Bosagarosta’is Cuvier. 
Olivaceous, sides silvery. Body extremely slender and elongated, 
much compressed, almost band-like. Back tbin, subcarinate. Lower 
jaw very slender and long, much longer than the rest of the head. 
Teeth very feeble. Eye large, about equal to snout. Pectoral fins 
long and slender, half as long as mandible, more than one-fourth the 
length of the rest of the body. Upper rays of pectorals broad and 
compressed. Ventrals not longer than eye, inserted far back. Caudal 
fiu uuequally forked, the lower lobe the longer. Uead G|; depth 10. 
Mandible about 3. D. 22; A. 19; V. 6. L. 18 inches. Cape Cod to 
Indian Ocean, in the open sea; rare on our Atlantic coast. 
(Cuvier, Regne Atiim. ; Giintber, vi, 276: Lleniirliamphus macrorhynditis Giintlier, vi, 
276: Euliptorhamplius longirostris Vntuskm, Proc. Dost. Soc. Nat. Hist. 1870, 238.) 
a§l.— E1A1LOCVPSEI.US Weiuland. 
(Weinlaud, Proc. Bost. Soc. Nat. Hist. 1859, vi, 385 : “type Exococtus mesogaster Mitch.”) 
This genus differs from Exoccetiis mainly in the anterior position and 
small size of the ventral fins, which terminate in advance of the anal 
fin, and are not used as organs of liight. Species not very numerous, 
(al?, sea; xuc^’sXo:;, a swallow.) 
606, la. evolasas (L.) Weinl. 
Olivaceous above, with dark specks; silvery below, with a brigh't blue 
lustre. Pectoral fins black above and behind, the lower border whitish. 
Snout obtuse and short, f the diameter of the eye. Eye not large, 4J 
in head, less than the width of the broad, rather convex, interorbital 
•space. Distance from snout to first ray of v^eutral about equal to dis- 
tance between root of ventrals and last ray of dorsal. Pectoral fins 
long, 4 the length of the body, reaching the root of the caudal ; second 
*Gill, Proc. Acad. Nat. Sci. Phila. 1859, 131: type Eiilcptorkamphus hrcvoorti Gill= 
Ucmirhamphus longirostris Q\x\icx. (dL>/\£Vro?j very slender; /ja/iipoJ, beak.) 
