248 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



6. HATCHERIA Eigenmann gen. nov. 



Type : HatcJievia patagoniejisis sp. nov. 



Dorsal long, emarginate ; caudal with very few accessory rays, which 

 are graduated ; anal below the posterior half of the dorsal ; caudal 

 peduncle very slender; caudal emarginate, the 'lobes rounded. 



Species of Hatcheria. 



a. D. 21 ; origin of dorsal equidistant from occiput and tip of caudal ; anal inserted below the ninth 

 dorsal ray and terminating under the seventeenth ; ventrals extending to vent. 10. niacrai. 



aa. D. 1 5 ; origin of dorsal equidistant from tip of snout and tip of caudal ; last ray of anal under 

 last ray of dorsal ; distance of anal from base of caudal 3I in the length. 11. viaatlata. 



aaa. D. 1 5 ; origin of dorsal equidistant from tip of caudal and posterior nares ; gill openings 

 not extending forward to eye ; last anal ray under last dorsal ray ; distance of anal from 

 base of caudal about 4^ in the length. 1 2. patagoniensis. 



aaaa. D. 14; origin .of dorsal equidistant from tip of caudal and occiput, its last ray over fourth 

 ray of anal ; gill openings extending forward to below eye, the membrane free from the 

 isthmus; distance of anal from base of caudal 5 in the length. 13. areolata. 



10. Hatcheria macr.^i (Girard). 



(Plate XXXII, Figs i, \a and \b) 



Thricojuycterus inacrcpi G\x2iX^, U. S. Naval and Astronomical Expedition 

 245, 1855 (Uspullata, elevation, 7000 feet). 



The only claim for retention the name Trichoniycterus possesses is its distinctiveness from 

 Thrichomyctenis Humb. = Eremophilus Humboldt. Twenty-two years before any species of 

 Trichomycterns Val. was known, the name Thrichoinyctcriis was proposed by Humboldt as an 

 alternative for his Eremophilus, if future investigations should prove Eremophilus to be objection- 

 able. Upon proposing the name Trichoniycterus Valenciennes states : " Nous prenons pour le 

 nouveau genre le nom de Trichoniycterus imagine par M. de Humboldt," so the names can hardly be 

 considered distinct, being either a misprint or a lapsus digiti. Valenciennes afterwards misquotes 

 himself, spelling the name Thychomyctenis instead of Trichoniycterus. Girard also misquotes 

 Valenciennes or quotes Humboldt correctly, using Thrichomycterus instead of Trichoniycterus. 



This genus has a wide distribution, extending along the Andes from Caracas to Chili on both 

 slopes. It is distinctly a mountain form, but it descends the Pacific slope to the coast at Callao 

 and the Amazon to Cudajas. It further occurs in the highlands of Guiana and Eastern Brazil. 

 There are in all about 35 species known. Some of these are found on both sides of the Andes, 

 but none have a wide distribution. On the contrary, the species seem to be local differentiations 

 of this widely distributed genus. Contrary to the general rule of distribution of South American 

 fresh-water fishes, that a genus with many species and a wide distribution has many representa- 

 tives in certain favorable localities, there is no place on record harboring more than one species 

 of this genus. We may expect the finding of many other species as restricted basins or isolated 

 valleys of the Andes and the temperate portions of South America are explored. 



The genus is without doubt one of veiy long standing. In Central Chili and Patagonia it has 

 become differentiated into Hatcheria. 



