328 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
One other specimen was collected January 19 at Mayaguez, 2 at Aguadilla January 18, and 1 at 
San Juan January 14. The two from Aguadilla may be described as follows: 
Measurements. 
No. 1. 
No. 2. 
125 
115 
4 
2. 16 
5.8 
5. 25 
2. 63 
2.25 
73 
52 
46 
123 
116 
4.14 
2. 33 
6.22 
5.9 
2.54 
2.17 
72 
51 
50 
Length to base of caudal 
Head (about) 
Depth (about) 
Eye (about) 
Pectoral 
Dorsal 
Color of same general pattern, but with large brownish blotches over body and one on caudal 
peduncle. 
Fig. 107 . — Etropus crossotus. 
Genus 158. ETROPUS Jordan & Gilbert. 
Eyes and color on left side. Body regularly oval, deep, and compressed. Head small; mouth 
very small, teeth close-set, slender, and pointed, somewhat incurved, mostly on blind side; no teeth 
on vomer. Eyes small, separated by a narrow, scaleless ridge; margin of preopercle free. Ventrals 
free from anal, that of colored side inserted on ridge of abdomen, its base rather long. Dorsal fin 
beginning above eye; caudal double-truncate; anal without spine. Scales thin, deciduous, ctenoid on 
left side, cycloid on blind side. Lateral line simple, nearly straight. 
This genus is very close to Citharichthys, from which it differs only in the very small size of 
mouth and in the correspondingly weak dentition. The 3 or 4 known species are similar in appearance 
to the species of Citharichthys and inhabit the same waters. Size small. Thysanopsetta, a South 
American genus, is also very close to Etropus and Citharichthys, but has teeth arranged in a band. The 
larval forms are translucent and symmetrical, as in Platophrys, Monolene, Arnoglossus, etc. 
a. Snout not acute; dorsal rays 75 to 85. 
b. Body comparatively elongate, depth rather less than one-half length. 
c. Dorsal rays 81; anal 58; head 4.25 in length; eye 3.5 in head; maxillary! microstomus 
cc. Dorsal rays 77; anal 61; head 4 in length; eye 3.5 in head; maxillary 4.33 rimosus 
bb. Body very deep, depth more than one-half length; eye 3.75 in head; maxillary 4; head 4.8; depth 1.8 to 2; D. 76 to 
85; A. 56 to 67; scales 42 to 48; cirri on subopercle of blind side very numerous, white; olive ground, with 
darker blotches; fins sanded crossotus, 280 
