28 CALIFORNIA ACADEMY OF SCIENCES. 



PRELIMINARY NOTES ON SOUTH AMERICAN 

 NEMATOGNATHI. 



II. 



BY CARL H. EIGENMANN AND ROSA SMITH EIGENMANN. 



The present paper is a continuation of the Preliminary 

 Notes which appeared in the Proceedings of the California 

 Academy of Sciences, 2d Ser., Vol. I, pp. 119-172. It 

 contains several forms omitted in the preceding paper, 

 a list of the genera and species of Loricariidae exclusive of 

 tlie genus Plecostomus, Bunocephalidie and Pygididse, with 

 descriptions of the following new forms: 



1, Acentronichtliys; 2, A. leptos; 3, Nemuroglanis; 4, N. 

 lanceolatus; 5, SteindacJmeria doceaiia; 6, Platystoma fasci- 

 atam reticidatum; 7, Pl.fasc. nigricans; 8, PL fasc. brevefile; 

 9, Tachisurus upsulonophovus; 10, Farloivella: 11, F. carinata; 

 12, Loricaria pcmamcnsis; 13, L. hrevirostris; 14, L. lata; 

 15, L. pJioxocephala; 16, Oxyropsis; 17, 0. wrigJitiana; 18, 

 Hisoiwtus; 19, H. notatus; 20, Microlepidogastev, 21, M. 

 parforatus; 22, Parotocinclus; 23, Neoplecostomns ; 24, Rhi- 

 nelepis lopliophanes; 25, Panaque; 26, Deltaviis; 27, D. 

 parahjhce; 28, HemipsilicMliys; 29, Ancistrus diagresi; 30, 

 A. stigmaticus; 31, A. clrrhosus dtihius; 32, Bunocephalus 

 scahriceps; 33, Pygidimn oroyce; 31, P. immaculatum; 35, 

 Tridens; 36, T. melanops; 37, T. hrevis; 38, Pseudosteg- 

 opJiilus; 39, StegopJiilus intermedins; 40, Miuroglanis; 41, 

 M. platyceplialus. 



SILUKIDiE. 



YI. c. AcENTRONiCHTHi'S gen. nov. 



Type, Acentronichthys leptos sp. uov. 



Caudal widely forked; occipital process small, not con- 



2d See., Vol. II. Issued August 18, 188i). 



