THE FISHES OF PORTO RICO. 
207 
161. Ulaema lefroyi (Goode). 
Head .3.2; depth 3.1; eye 3; snout 3.1; maxillary 3.1; mandible 2; interorbital 3.5; D. ix, 10; 
A. n, 8; scales 5-46-10. Body long and slender, dorsal profile only slightly elevated; snout long and 
pointed; mouth moderate, maxillary reaching only to anterior border of eye, its exposed portion 
short and triangular; interorbital broad; premaxillary groove long, narrow, and naked; preorbital and 
preopercle entire; eye large. Fins small; dorsal spines all slender and weak, second slightly shorter 
than third, 1.9 in head; longest dorsal rays about 3.1 in head; second anal spine small and rather 
short, 4 in head; caudal fin long, lobes about equal to head; pectoral slender, 1.25 in head; ventrals - 
short, reaching only halfway to anal, 2.1 in head. 
Color, silvery, darker above, with bluish iridescence, white below; fine dusky punctulations every- 
where, thickest on back; dorsal, anal, and caudal dusky, other fins pale; axil dusky; snout dusky. 
Found in the West. Indies, on sandy shores; known from the Bermudas, Cuba, Porto Rico, Key 
West, and Cedar Keys. Length 4 to 6 inches. A specimen, 5 inches long, was obtained at Culebra 
Island, February 9. 
Diaplerus lefroyi Goode, Amer. Journ. Sci. Arts 1874, 123, Bermudas. 
Eucinostomus productus Poey , Enumeratio, 55, 1875, Havana. 
Ulienia lefroyi , Jordan & Evermann, 1. c., 1371, 1898. 
Genus 91. XYST2EMA Jordan & Evermann. Mojarras Blancas; Muniamas. 
This genus differs from Gerres in having the preopercle entire. The body is compressed, but not 
greatly elevated, and the second anal and fourth dorsal spines are less enlarged than in Gerres. The 
second interhsemal is long and spear-shaped, not hollow and not receiving air-bladder, its structure 
as in Gerres. One species, widely distributed. 
162. Xystaema cinereum (Walbaum). Mojarra; “ Muniama.” 
Head 3.2; depth 2.6; eye 3.4; snout 3; maxillary 2.6; mandible 2; interorbital 3.25; scales 
6-45-11; D. ix, 10; A. iii, 7. Body compressed, elongate, dorsal profile moderately and regularly ele- 
vated, interorbital region slightly depressed; mouth moderate, maxillary extending to vertical of anterior 
edge of pupil, its exposed portion triangular in form and twice as long as wide, its length 5 in head; 
preorbital and preopercle entire; maxillary groove broadly ovate and without scales; gillrakers weak, 
7 below angle; distance from tip of snout to origin of dorsal fin, 2.4 in body; second dorsal spine longest, 
1.6 in head, not much longer than the others, all being weak and flexible; general outline of upper 
margin of dorsal fin falcate; second and third anal spines subequal, second not much enlarged, 2.6 in 
head; pectoral long and pointed, its length slightly greater than head; ventrals short, 2 in head; caudal 
deeply forked, lobes equal, 0. 7 in head. Scales moderately firm, a sheath at dorsal and anal fins; caudal 
densely covered with minute scales. 
