1314 Bulletin 47, United States Natiotial Museum. 



lower jaw slightly included.. Teeth small, the outer aud posterior little 

 enlarged. Preorbital narrow, its least breadth 7| in head ; interorbital 

 space moderate, convex, 3* in head; preopercle moderately serrate. Gill 

 rakers slightly longer and more numerous than in most species of Hcemitlon, 

 about 16 on lower part of arch, the longest about ^ depth of jjreorbital. 

 Scales large, very uniform in size over the body, arranged above as well 

 as below lateral line, in longitudinal series, those above lateral line being 

 everywhere parallel with the lateral line; soft tins scaly, as usual. Dor- 

 sal spines usuiilly 13, but sometimes 14, rather slender and low, the longest 

 2i^, in head; soft dorsal low, the longest rays 3^ in head ; caudal moderate, 

 the upper lobe l.f in head; anal rather low, the longest rays not reaching, 

 when depressed, to middle of last rays, their length about 3 in head; sec- 

 ond anal spine stronger and longer than third, 2| in head, its tip about 

 reaching base of last ray; ventrals If in head; pectorals 1^. Frontal 

 foramina narrowly oval, wholly separate, some distance in front of the low 

 supraoccipital crest. Color dark brown; each scale of back and sides with 

 a light pearly-gray spot on its middle, these coalescing into continuous 

 light stripes which are sharply defined, one for each row of scales; head 

 plain; fins plain grayish ; a large dusky area on base of caudal. Its pecu- 

 liar squamation, rendered more noticeable by the corresponding features 

 of coloration, gives it an appearance quite distinct in this genus. The 

 snout is shorter than usual and the number of dorsal spines is increased. 

 In other respects it departs less from the usual type than does Lythrulon 

 fiaviguttatum or oven Bathystoma striatum. The cranium is of the usual 

 Haimulon tyipe. Pacific coast of tropical America, Guaymaa to Panama; 

 rather common; here described from No. 29256, U. S. N. M., 8' inches long, 

 from Panama. Length about a foot, (macula, spot; caw da, tail.) 



Orthostoechus macuUcauda, Gill, Proc. Ac. Nat. Sci. Pliila. 1862, 255, Cape San Lucas 



(Coll. Xantua). 

 Rcem,ulon mazatlanum, Steindachnee, Iclith. Notlzen, viii, 12, pi. vi, 1869, Mazatlan. 

 Scemulon macuHcaiida, Steindachnee, Iclith. Beitrage, ni, 14, 1875; Joedan & Swain. 



I. c, 315; EvEEMANN & JENKINS, Proc. U. S. Nat. Mus. 1891, 152; Joedan & Fesleb, 



I. c, 480. 

 Diabasis macuUcauda, Joedan &, Gilbeet, Proc. U. S. Nat. Mns. 1882, 362, 372, 626. 



542. ANISOTREMUS, Gill. 



Anuotremus, Gill, Proc. Ac. Nat. Sci. Phila. 1861, 107 (virginicus). 

 Oenytremus, Gill, Proc. Ac. Nat. Sci. Phila. 1861, 256 (hilineatns). 

 Paraeonodon, Bleeker, Archiv Neerl. xi, 272, 1876 (pacifici). 



Body ovate, short, deep, and compressed; mouth rather small, with 

 thick lips, the maxillary rather short; inside of mouth not red; teeth in 

 jaws only, all pointed, those of the outer series in upper jaw enlarged; 

 chin with a median groove, besides smaller pores. Dorsal spines stroug; 

 soft rays of dorsal and anal scaly at base; anal spines strong; caudal 

 mostly lunate. Scales large. Lower pharyngeals broad, with coarse, 

 blunt teeth. This genus, like Hamulon, to which it is closely related, 

 contains numerous species, all of them living on the shores of tropical 

 America. All the species undergo considerable change in form with age, 



