270 MEMOIRS OF THE CARNEGIE MUSEUM. 



The Stegophilimv, Vandelliince and Tridentince are essentially lowland forms, 

 although some species reach considerable elevations. 



Chronology. 



The first species of the Pygidiidoe. discovered was taken by Humboldt at Bogota, 

 and described in 1805 {Recueil d' Observations de Zoologie, etc., pp. 17-19, pi. VI) 

 as Ereniophilus mutisii. 



The habit of one of the species was next described by Spix in 1829, but attri- 

 buted to a member of another family. See page 262. 



The most prominent genus was first described by Meyen (Reise, I, p. 475, 

 Wiegm. Arch. Naturg., 1835, II, p. 269) as Pygidium. I have at diverse times 

 defended the name, Pygidium, as against the name TricJwmycterus and its varia- 

 tions. 



The various generic names and their present equivalents are given in the fol- 

 lowing table : 



Name Proposed. Proposed in Present Equivalent. 



Eremophilus Humboldt 1805 Eremophibis Humboldt. 



Thricho7nycterus Cuvier & Valenciennes 1S0.5 Eremophilus Humboldt. 



Trichomycterus Valenciennes 1833 Pygidium Meyen. 



Vandellia Cuvier & Valenciennes 1846 Vandellia Cuvier & Valenciennes. 



Thrychomycterus Cuvier & Valenciennes 1846 Pygidium Meyen. 



Thrichomycterus Girard 18.55 Pygidium Meyen. 



Pareiodon Kner 1855 Parciodon Kner. 



Centrophorus Kner 1855 Pareiodon Kner. 



Stegophilus Reinhardt 1858 Stegophilus Reinhardt. 



Astemomycierus Guichenot 1860 Pareiodon Kner. 



Pariodon Giinther 1864 Pareiodon Kner. 



Trachypoma Giebel 1871 Eremophilus Humboldt. 



Tridens Eigenmann & Eigenmaim 1889 Tridens Eigenmann & Eigenmann. 



Pseudoslegopkilus Eigenmann & Eigenmann .... 1889 Pseudostcgophilus Eigenmann & Eigenmann 



Miuroglanis Eigenmann & Eigenmann 1889 Miuroglanis Eigenmann & Eigenmann. 



Acanthopoma Liitken 1891 Acanthopoma Liitken. 



Homodiatus Eigenmann & Ward 1907 Homodiwlus Eigenmann & Ward. 



Hmoncmus Eigenmann & Ward 1907 Henonemus Eigenmann & Ward. 



Hatcheria Eigenmann 1909 Hatcheria Eigenmann. 



Ochmacanthus Eigenmann 1912 Ochmacanthus Eigenmann. 



Gyrinurus Ribeiro 1912 Ochmacanthus Eigenmann. 



Paravandellia Ribeiro 1912 Paravandellia Ribeiro. 



Cobitoglanis Fowler 1914 Henonemus Eigenmann. 



Urinophilus Eigenmann 1917 Urinophilus Eigenmann. 



Branchioica Eigenmann 1917 Branchioica Eigenmann. 



