480 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
the vertical fins, and especially the increased development ot the gill- 
rakers, we may regard it as the type of a distinct subgenus, which has 
been called Lythrulon. The cranium shows no special peculiarity 
except the shortness of the snout and the development of the high 
supraoccipital crest. Specimens are in the Cambridge museum from 
Acapuleo. Our specimens were collected at Guaymas by Evermann & 
Jenkins. 
50. H#AMULON MACULICAUDA. (Roncador Raiado.) 
Orthostachus maculicauda Gill, Proc. Ac. Nat. Sci. Phila. 1862, 255 (Cape San Lucas). 
Hamulon maculicauda, Steind., Ichth. Beitr., 11, 14, 1875 (Mazatlan, Acapulco) ; Jordan 
& Swain, l. c., 315; Evermann & Jenkins, Proc. U. 8. N. M. 1891, 152 
(Guaymas). 
Diabasis maculicauda, Jordan & Gilbert, Bull. U.S. F. C. 1881, 325, 1882, 110 (Pan- 
ama); Jordan & Gilbert, Proc. U. 8. N. M. 1882, 362, 372, 626 (Cape San 
Lucas, Panama, Colima). 
Hamulon mazatlanum Steindachner, Ichth. Notizen, vu, 12, taf. v1, 1869 (Mazatlan). 
Habitat: Pacific coast of tropical America, Guaymas to Panama. 
Etymology: Macula, spot; cauda, tail. 
This small species is rather common on the Pacific coast of tropical 
America. Its peculiar squamation, rendered more noticeable by the 
corresponding features of coloration, give it an appearance quite dis- 
tinct in this genus. The snout is shorter than usual and the number 
of dorsal spines isincreased. In other respects it departs less from the 
usual type than do H. flaviguttatum and H. striatum. The cranium 
differs little from the ordinary Hamulon type. The specimens in the 
museum at Cambridge are from Acapulco. The specimens before us 
were collected at Guaymas by Evermann & Jenkins. 
XIII. ANISOTREMUS. 
Anisotremus Gill, Proc. Ac. Nat. Sci. Phila. 1861, 107 (virginicus). 
Genytremus Gill, Proc. Ac. Nat. Sci. Phila. 1861, 256 (bilineatus). 
Paraconodon Bleeker, Archiy. Neerl., x1, 272, 1876 (pacifici). 
Type: Sparus virginicus Linneus. 
Etymology: doos, unequal; tpzya, aperture, from the pores at the 
chin. 
This genus, like Hamulon, to which it is closely related, contains 
numerous species, all of them restricted to the shores of tropical 
America. All the species undergo considerable change in form with 
age, and all of them are valued as food-fishes. The young are marked 
with two or three blackish lengthwise stripes. These disappear with 
age, quickest in the brightly colored species, and persist for a loug 
time in species like surinamensis and interruptus, which agree in color- 
ation with Hemulon parra and related species. 
Only a skeleton of the synonymy of this genus is here given., 
