480 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



the vertical fins, and esi>e(;ially the increased development of the fjill- 

 rakers, we may rejjard it as the type of a distinct subgenus, which has 

 been called LiithruUm. The cranium shows no special peculiarity 

 except the shortness of the snout and the development of tlio hij,di 

 supraoccipital crest.' Specumens are in the CambridjiC museum from 

 Acapulco. Our specimens were collected at Guaymas by Evermanu & 

 Jenkins. 



50. HiEMULON MACULICAUDA. (Roncador Raiado.) 



OrthoHlachus mamJicauda Gill, Froc. Ac, Niit. Sci. I'hila. 1S(>2, 255 (t'apo San Lucas). 



Hamnlon maciiUcaiida, Stoind., Iclith. Bcitr., iii, 14, lS75(Miizatlan, Acapulco) ; Jordan 

 & Swain, 1. c, 315; Evcrmann & Jenkins, Proc. V. S. N. M. 1891, 1.52 

 ((Jnaynias). 



Diabasis maailicai(da, JoTdun & flill.cit, Hull. IT. S. F. C. 1881, 325, 1882, 110 (Pan- 

 ama); Jordan & Gilbert, Proc. U. S. N.M. 1882, 362, 372, 626 (Cape San 

 Lucas, Panamn, C<dinia). 



Hfrmulon mazatlanitm Stcindachncr, Iciith. Notizcn, viii, 12, taf. vi, 1869 (Mazatlan). 



Habitat: Pacific coast of tropical America, Guaymas to Panama. 



Etymology: Maciihi, 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 is increased. In other respects it departs less from the 

 usual type than do H. favigutfatum and H. striatum. The cranium 

 differs little from the ordinary Hammlon type. The specimens in the 

 museum at Cambridge are from Acapulco. The specimens before us 

 were collected at Guaymas by Evermanu & Jenkins. 



XIII. ANISOTREMUS. 



AnisotremuB Gill, Proc. Ac. Nat. Sci. Plula. 1861, 107 {rirfjhiicus). 

 Genytremus Gill, Proc. Ac. Nat. Sci. Pliila. 1861, 256 {hilineatus). 

 Paraconodon Blceker, Arcliiv. Nccrl., xi, 272, 1876 {pavifin). 



Type: Spams virginicus Linnieus. 



Etymology: avnT<><;, mieqnal; rprj/ia, aperture, from the pores at the 

 chin. 



This genus, like HccmtUon, to which it is closely relatetl, 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 lengtlnvise stripes. These disappear with 

 age, quickest in the brightly colored species, and persist for a long 

 time in species like surinamcnfiis and interrupt us, Avhich agree in color- 

 ation with Hivmulon parra and related si)ecies. 



Only a skeleton of the synonymy of this genus is here given. 



