3158 Bulletin 4.7, United States National Museum. 



and opaque in life. The other (Lethostole), typified by Chirostoma estor, has 

 the flesh thin, translucent, and very pale. There are correlated differences 

 in the firmness of the bones and scales, but thus far we have found no 

 tangible character on which to separate Lethostole as a genus from Chiros- 

 toma. The known species of Lethostole are estor, album, chapahc, grandocule, 

 promelas, diazi, crystallinum, lermce, and ocotlane. 



1157 (a). ESLOPSARLM ABGE, Jordan & Snyder. 



Head 4; depth 4; depth of caudal peduncle 2f in head; eye 3; snout 

 3; interorbital space 3^-; height of spiuous dorsal 3; soft dorsal 2; 

 anal 2; length of pectoral H; ventrals 2$; caudal 1A; D. IV-8; A. 15; 

 P. 13; scales 40-11, 5 between the dorsals. Body rather thickset, its 

 deepest part just anterior to base of veutrals; width of body equal to 

 distance from posterior edge of orbit to tip of snout; eye nearer to tip of 

 snout than to posterior edge of opercle by a distance equal to diameter of 

 pupil; interorbital space convex; width of preorbital area equal to diam- 

 eter of pupil; tip of lower jaw projecting beyond that of upper; mouth 

 large, oblique; lips not much thickened posteriorly, the lower not dis- 

 tinctly folded over the upper at their angle; maxillary extending poste- 

 riorly to a perpendicular passing through anterior edge of orbit, its distal 

 ead below the level of eye; teeth large, sharp, projecting backwards, in 

 2 definite rows on each jaw, none on vomer or palatines ; gill-rakers on 

 first arch 14, long and slender; air-bladder extending posteriorly to a 

 point a little past insertion of anal; peritoneum black; vertebra 1 37. 

 Lateral line represented on the fifth row of scales below the dorsal by a 

 series of partly developed pores; scales large, entire, coveriug head and 

 body except snout, lower jaw, preorbital area, and a small space around 

 base of pectoral; small scales extending for a short distance on inter- 

 radial membranes of caudal; first 3 dorsal spines of about the same 

 height, the fourth shorter; first dorsal ray longest, the others gradually 

 shorter; edge of fin straight; anal inserted on a perpendicular, passing 

 halfway between dorsals, its first ray longest: edge of fin slightly cou- 

 cave; caudal notched, the tips and notch rounded, extending to bases of 

 veutrals; ventrals falling short of vent a distance equal to diameter of 

 orbit. Color in life, translucent; a silvery lateral band with its upper 

 edge dark, extending from upper part of base of pectoral to base of 

 caudal, the band less distinct in the region of the pectoral fin; scales of 

 back edged with fine, dark specks; snout, lower jaw, top of head, and 

 upper part of eye dusky; dorsal and caudal fins with a little dusky 

 coloring. 



Specimens of E. arge were caught in the same seine-haul with E.jordani. 

 The former species differs from the latter in having a thicker body, a 

 longer snout, a larger and less oblique mouth, a larger eye, and a wider 

 color band. 



In the drawing accompanying the original description of Eslopsarum 

 jordani the mouth is wrongly represented. Of the specimens examined, 

 including some of the types, the mouth is much like that of Chirostoma 

 humboldtianum. The cleft is not straight in outline. The lower lip folds 

 over the upper at their union. (Jordan & Snyder.) (arge, silvery.) 



