THE FISHES OF PORTO RICO. 
107 
rather broad. Male Ashes with an egg pouch along under side of tail, formed by two cutaneous folds, 
and splitting lengthwise to release the young fishes. 
Species very numerous, inhabiting all warm seas; abounding in bays among the seaweeds and 
entering rivers. The females in most species are deeper than the males, with more robust trunk, 
longer snout, and a more distinct ventral keel. 
a. Top of head with a slight carination or none; snout keeled or not; operele without prominent ridge; base of dorsal 
not elevated. 
b. Dorsal moderate or long, its first ray in advance of vent; snout moderate or long; angles of body generally 
prominent. 
c. Dorsal covering 1 or 2 body rings. 
d. Dorsal covering about 6 or 7 caudal rings, rarely fewer. 
e. Caudal rings 36 to 41 fistulatum 
ee. Caudal rings 31 to 34. 
/. Dorsal 29 to 32, on 2+6 rings mackayi, 57 
ff. Dorsal 27, on 1+7 rings, rarely on 2+6 floridx , 58 
eee. Caudal rings 24; body rings 19; dorsal rays 30, on 1+6 rings; snout long; body slender poeyi 
dd. Dorsal covering 4 or 5 caudal rings, 
fir. Dorsal rays 24 to 32. 
h. Dorsal rays 29 to 32, on 1 + 9 rings; rings 17 + 35; snout 2 in head, head with keel pelagicum 
hh. Dorsal rays 26 to 28, on 1.5 + 5 rings; rings 16 + 34; snout short, 2 in head; head with slight keel rousscau 
hhh. Dorsal rays 23 to 25, on about 1 + 4 rings; rings usually 16 + 33; snout short, 2 in head clucens, 59 
firfir. Dorsal very short, 18 rays, on 1 + 5 rings; rings 17 + 32; snout short jonesi, 60 
ddd. Dorsal very short, covering 3 caudal rings and 1.5 body rings, its rays 20 to 23; rings 17 + 27; snout very short; head 
keeled above brachycephalnm 
ec. Dorsal covering 3 body and 4 to 6 caudal rings. 
i. Kings 16 to 18 + 29 to 33. 
j. Snout rather short, not half length of head; dorsal fin very high; rings 18 + 33; dorsal 35, on 5 + 4 rings; belly in 
female with a black keel; sides with narrow vertical silvery streaks; dorsal spotted affine 
jj. Snout rather long, more than half head. 
ii. Rings 20 to 21 + 36 to 38; dorsal 32 to 37, on 3 + 5 rings; belly flat or slightly concave; snout moderate louisianse 
iii. Rings 16 to 20 + 36 to 40; dorsal 36 to 40, on 5 + 4 or 4 + 5 rings fuscum 
lb. Dorsal fin very short, its first ray not in advance of vent; rings 15 + 37 to 39; snout very short, less than two-fifths 
head; angles of body little marked, the form subterete crinigerum 
57. Siphostoma mackayi Swain & Meek. 
Head 5.66 to 6.25 in total length. D. 29 to 32; rings 184-33 to 36. Snout compressed, 1.75 
to 2 in head, its median line with a slight keel above and below, with smaller keels on each side; 
operele not keeled. Dorsal somewhat higher than width of a body ring, its base about 1.33 in length 
of head, covering 24-6 rings. Pectoral higher than length of base; tail about 1.83 in total length of 
fish; body deep, its greatest depth in adult females equaling width of four body rings. 
Color in spirits: Grayish or dark olive; males with about 14 dark-gray crossbars on side, broader 
than interspaces; body usually more or less spotted with small white spots; dorsal pale, usually dotted 
over with darker; caudal dusky, generally spotted with white; operele usually with white bars. 
Gulf of Mexico and West Indies; known from the Snapper Banks off Pensacola, Key West, and 
Cozumel, Yucatan; rather common. One specimen, a female, 7 inches long, taken at Mayaguez, 
January 19. 
Siphostoma mackayi Swain & Meek, Proc. U.S. N. M. 1884, 239, Key West; Jordan & Evermann, 1. e., 766, 1896. 
58. Siphostoma lioridae Jordan <k Gilbert. 
Head 6 to 6.5 in total length. D. 27 ; rings 17 to 18 -f- 31 to 32. Snout rather short, about 1.66 
in head; median line well keeled above and below, the ridge on both sides of median ridges above and 
below not so conspicuous. Occiput and operele little keeled. Dorsal shorter than head, covering 
1 4~ 6 to 7 rings, its height 5 times in base; caudal fin 2.5 in base of dorsal; pectoral slightly higher than 
length of base; tail longer than trunk, 1.83 in total length, caudal pouch covering about 18 rings. 
Color in life: Dark green; side with gray specks and without dark band; tail with faint darker 
bars, broader than interspaces; sides of tail especially mesially, with many rough and oblong pale 
spots; snout mottled, especially on side; lower part of the operele nearly plain; dorsal translucent, 
yellowish at base; caudal yellow, dusky at tip; anal plain. 
Found on sandy shores from North Carolina to Texas (Beaufort, N. C., Corpus Christi, Tex.); 
rather common. Three specimens seined in Ensenada del Boqueron, January 26. 
Siphostoma floridx Jordan & Gilbert, Proc. U. S. N. M. 1882, 263, Pensacola, Fla.; Jordan & Evermann, 1. c., 766, 1896. 
