432 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
ill single series on jaws, vomer, and palatines. Dorsals two, the first 
preceded by a procumbent spine. No finlets. Two strong spines before 
the anal, connected by meiiibrane. Pyloric coeca iinmerons. In all 
warm seas. ancient name of T. sttiii'iiSf from rpayu^^ 
rough ; oupa^ tail.) 
0§0. 'r. syEBiiiicti’DCSis (Ayres) Girard. — Horse MacJccrl. 
Similar to T. saurus, but slenderer and less compressed. Arch of 
lateral line longer, as long as straight part, the junction of the two much 
beyond tip of pectoral; plates on the anterior part small, crowded, their 
height less than half eye. Head 3i}; depth Ij. D. VIII-I, 31; A. 
11-1, 27 ; Lat. 1. 48 + 47. Coast of California, from San Francisco south- 
ward ; very abundant in snmmer. 
{Caranx syminctricus Ayres, Proc. Cal. Acad. Nat. Sei. i, 1855, 62; Girard, Pac. R. R. 
Surv. Pish. 107.) 
981. T. SBiBsrEis Raf. — Horse Ifaclercl ; Slcij) Jacl' ; SaureJ. 
Greenish, sides silvery; a dusky opercular spot. Body more com- 
pressed and deeper than in the preceding. Head rather long. JMontli 
moderate, the maxillary reaching the front of eye. Eye large, eqnal to 
snout, 4 ill head ; arch of lateral line short, reaching scarcely beyond pec- 
toral, 1^ in siraiglit part, the plates high, nearly as high anteriorly as 
posteriorly, their lieight more than half eye. Head 3.t; depth 4. D. 
YIII-I, 21); A. II-I, 28; Lat. 1. 40 -f 37. L. 1 foot. Southern Europe; 
occasional on our South Atlantic coast. 
(Scomber trachurHslAnn. Syst. Nat. i, 1758: Caratix irachurus Lac(Sp&de, iii, 63: ? Car- 
anxomorus 2)1 tiinierianus Lac6p. Hist. Nat. Poiss. iii, 84 : ^ Selar japonicus Bleeker, Verb. 
Bat. Gen. xx, vi, Japan, pi. 8 : Trachunis saitrus Ratinesqne, 1. c. 20 : Trachiirus trachnrus 
Giiuthei, ii, 419. 
220. DECAPTERrS Bleeker. 
Macl'erci Scads. 
(Bleeker, Natnnrk. Tydsehr. 1855, v, 417 : type Caranx I'lD'ra Cnv. & Val.) 
Body elongate, little compressed, almost perfectly fusiform. Head 
short, pointed. ]Mouth rather small ; jaws about equal, the dentition 
feeble. A supplementary maxillary bone. Bremaxillaries protractile. 
Scales moderate, enlarged and spinous along lateral line posteriorly; 
second dorsal and anal each with a single detached finlet ; free anal 
spines very strong. Abdomen rather shorter than anal fin. Gill-rakers 
long and slender. Species nnmerons. {dzxac, ten ; rrs/xJv, fin ; there being 
ten fins, counting the spurious finlets mid excluding the free spines.) 
682. D. piinetatlBS (Agassiz) Gill. — Scad; liOtind liohin. 
Bluish above, silvery below; a dark opercular spot. Eye rather 
small, shorter than snout, about equal to the width of cheeks or the in- 
