THE FISHES OF PORTO RICO. 
297 
Gobius cauda longissima acuminata Gronow, Zoophyl., 82, No. 227, pi. 4, fig. 4, 1763, locality unknown. 
Gobius oceanicus Pallas, Spicilegia, VIII, 4, 1769, after Gronow; Jordan & Evermann, 1. c., 2230, 1898. 
Gobius lanceolalus Bloch, Pische Deutseblands, II, 8, pi. 38, fig. 1, 1783, Martinique. 
Gobius bacalaus Cuvier & Valenciennes, Hist. Nat. Poiss., XII, 119, 1837, Surinam, Cayenne, and Cuba. 
Gobionellus lanceolalus, Poey, Fauna Puerto-Kiquena, 338, 1881; Stahl, 1. c., 78 and 165, 1883. 
Fig. 91 . — Gobius oceanicus. 
Genus 139. AWAOUS Steindachner. 
Inner edge of shoulder-girdle with two or more conspicuous dermal flaps; preorbital region very 
long; premaxillary and maxillary strong; lips thick; scales rather small, ctenoid, 40 to 80 in a longi- 
tudinal series; interorbital groove with a conspicuous median crest; otherwise essentially as in Gobius. 
The species reach a large size and are confined to the fresh waters of the tropics of America and to the 
Hawaiian Islands. Asiatic species of similar habit have much larger scales and seem to form a distinct 
genus, Rhinogobius Gill. The physiognomy in each is peculiar, the snout being long and convex. 
a. Scales about 53, little crowded anteriorly, 21 before dorsal on nape; depth 5.66 in length; head 4; eyes placed high, 
interorbital area equal to diameter of eye; mouth horizontal; maxillary extending to middle of eye, 2.33 in 
head, lower jaw more flat than in A.taiasica; teeth small, in narrow bands, those of outer row above enlarged, 
some large teeth in band of lower jaw. D. vi-i, 12; A. 1 , 10. Uniform yellowish in spirits flavus 
aa. Scales 60 to 70, crowded anteriorly, about 30 scales before dorsal on nape; 21 scales between second dorsal and anal; 
head broader than high; body compressed posteriorly, rather depressed anteriorly; greatest depth 5.25 in 
length; head 3.25 in length. Olivaceous; a series of irregular, roundish blotches along middle of side; narrow 
dark streaks radiating from eye: a blackish streak running across upper margin of opercle and extending 
obliquely across base of upper pectoral rays; belly white; dorsal and caudal more or less distinctly barred with 
wavy blackish lines. D. vi-11; A. 11; scales about 65 laiasica , 251 
aaa. Scales 76 to 82, 24 scales between second dorsal and anal; head as broad as high; depth of body 6.6 in length; head 4, 
fiat above, snout elongate, upper profile oblique; eye one-eighth of head, equaling interorbital area (in 
adult); mouth horizontal; lower jaw included; maxillary reaching to below anterior margin of eye; teeth of 
outer series enlarged; canine teeth none; scales ctenoid, those on nape and anterior part of body very small; 
head naked; dorsal fins lower than body', none of the spines produced; caudal rounded, 7 in length of body. 
Yellowish olive; back and sides reticulated with blackish; head, dorsal, caudal, and pectoral fins dotted with 
blackish, the spots forming streaks on second dorsal; six cross-series of dots on caudal; an irregular small 
blackish spot on upper part of root of pectoral. D. vi-11; A. 11; scales about 80 mexicanus 
251. Awaous taiasica (Lichtenstein). “Guavina”; “ Saga” or “ Zaga.” 
Head 3.5; depth 5.4 to 6; eye 5.5 to 6; snout 2.2 to 2.4; maxillary 2.4 to 2.9; mandible 2.4 to 3; 
interorbital 6.5 to 8; preorbital 3.3 to 4; scales 66 to 71,-22; D. vi-11, longest spine about 2 in head, 
longest ray 2; A. i, 10, longest ray 2 to 3 in head; pectoral 1.6; ventral 1.7; caudal 1.5. Body rather 
slender, head heavy, somewhat depressed, tapering, its greatest width about 1.5 in its length; snout 
long; mouth moderate, very broad, its width about 2.5 in head; maxillary reaching anterior border of 
orbit; lips very heavy, upper with a broad flap; teeth of upper jaw in two series, those of anterior 
series much enlarged and recurved ; teeth of lower jaw in a narrow band, outer scarcely enlarged ; no teeth 
on vomer or palatines; isthmus very broad, gill-openings scarcely extending forward; branchiostegals 
4; gillrakers 3 + 6, very short and soft; inner edge of shoulder-girdle with 2 or 3 short papillae. 
Posterior half of body compressed, least width of caudal peduncle about half its least height. Scales 
small, ctenoid, much reduced anteriorly, those on nape and in front of dorsal embedded and cycloid, 
about 30 series between dorsal and occiput; head naked; breast scaled. Fins rather large; origin of 
