FISHES FROM MEXICO AND CENTRAL AMERICA. 
153 
33. Caranx crysos (Mitchill). Hard-tail; Runner. 
One specimen, 9 inches long, from Puerto Morelos. Head 3.5; depth 3; eye 3.5; snout 3; maxil- 
lary 2.5; mandible 2.2; interorbital 3.25; preorbital very narrow, about 16; D. viii-i, 24; A. ii-i, 19; 
pectoral one-eighth longer than head, 3 in body; longest dorsal ray 2 in head; about 48 scutes. 
34. Trachinotus giaucus (Bloch). Old-wife. 
One specimen, 10 inches long, from Puerto Morelos. Head 3.83; depth 2; eye 3.75; snout 4.5; 
maxillary 2.66; mandible 2.75; interorbital 2.75; preorbital very narrow; D. vi-r, 20; A. ii-i, 17; 
longest dorsal ray 1.5 in body; longest anal ray 2.33; anterior rays of dorsal and anal greatly produced, 
reaching somewhat beyond middle of caudal. 
35. Centropomus mexicanus Bocourt. Mexican Robalo. 
One specimen, 12.5 inches long, from Montecristo. Head 3; depth 3.66; eye 5.75; snout 3.5; max- 
illary 2.66; mandible 1.75; interorbital 7; preorbital 13.5; scales 11-80-14; D. viii-i, 10; A. in, 6; 
longest dorsal spine 2 in head, 1.5 in depth of body ; longest anal spine 1.66 in head, 1.25 in depth of body ; 
pectoral as long as ventral, 1.66 in head; ventral outline nearly straight; suborbital with 8 or 10 sharp 
retrorse teeth; preorbital with teeth at angle strongly serrated; opercular flap large, nearly reaching 
front of dorsal. General color in alcohol, dusky, silvery below, darker above; lateral line in a narrow 
black band; a dark blotch on middle of opercle, covering nearly half of it; faint indications of dark 
blotches over body above lateral line; dorsal membranes dark, other fins pale, except third anal spine, 
which is dark brown. 
This fish is close to C. parallelus, but differs in that C. mexicanus has more teeth on the suborbital, 
those at the preopercle being fewer at the angle, larger and wider apart; those on the suprascapular 
are not so large, but there are 6 or 7, while in C. parallelus only 4 or 5 are found; scales larger in 
C. mexicanus , 5 or 6 fewer in lateral line, and 1 or 2 fewer between the lateral line and second dorsal. 
36. Petrometopon cruentatus (Lacepede). Coney; Red Hind. 
One specimen, 6.75 inches long, from Puerto Morelos. Head 2.8; depth 3.2; eye 5; snout 4.6; 
maxillary 2; mandible 1.75; interorbital 6.75; preorbital 10.5; D. ix, 14; A. in, 8; pectoral 1.6; ventrals 
2 ; scales about 12-85-30. Body not so deep as in specimens heretofore described, nor is the supplemental 
maxillary so evident. 
37. Lutianus griseus (Linnseus). Gray Snapper. 
Five specimens, 8.25 to 9.5 inches long, from Mujeres Island and one specimen, 3.5 inches long, 
from Cozumel Island. Head 2.7; depth 2.75 to 3; eye 4.3 to 5; snout 2.8 to 3; maxillary 2.5 to 2.8; 
mandible 2 to 2.3; interorbital 6 to 6.5; preorbital 6 to 6.5; D. x, 13 or 14; A. in, 8; scales 7-54-13, 7 
rows on cheek; width of interorbital and preorbital usually equal; the fourth dorsal spine the longest, 
2.75 to 3 in head; second and third anal spines about equal, the second the stouter, 3.3 to 3.67 in head; 
pectoral 1.5 to 2 in head; ventral 2 in head. 
38. Hsemulon parra (Desmarest). 
One specimen, 5.5 inches long, from Cozumel Island. 
39. Pomadasis ramosus (Poey). 
One specimen, 8.75 inches long, probably from Montecristo. Head 3.3; depth 3.5; eye 4.3; 
snout 3 ; maxillary 3.5 ; mandible 3.5 ; interorbital 4 ; preorbital 6 ; scales 6-55-12 ; D. xm, 12 ; longest 
dorsal spine 1.8 in head; A. in, 7 ; longest spine 1.5 in head; pectoral and ventral each 1.5 in head. 
40. Orthopristis chrysopterus (Linmeus). Pig-fish. 
Two specimens, 9.75 and 10 inches long, from Progreso. Head 3 ; depth 2.8 ; eye 5.5 ; snout 2.25 ; 
maxillary 3.3 ; mandible 3 ; inter orbital 4.67 ; preorbital 3.6 ; pectoral 1.5 in head; D. xii, 16 or 17; 
A. hi, 11 or 12 ; scales 10-65-17. Longest dorsal spine 3 in head ; second anal 6 in head ; base of soft 
dorsal 1.5 in spinous dorsal ; highest dorsal spine 3 in head ; pectoral not reaching past tips of ventrals. 
41. Xystaema cinereum (Walbaum). Mojarra Blanca. 
Two specimens, each 8.5 inches long, from Mujeres Island, and one small example from Cozumel 
Island. Head 3.3; depth 2.75; eye 3.25; snout 3.25; maxillary 2.8; mandible 2; interorbital 3; 
scales 6-45-10; D. ix, 11; A. in, 6; second dorsal spine longest, 1.8 in head; second anal spine 
longest, 2.5 in head; ventral short, not reaching vent, 1.66 in head; pectoral fin slightly longer than 
head ; caudal deeply forked, lobes longer than head, scaled ; dorsal and anal fins, when depressed, 
entirely concealed in a scaly sheath. 
