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).
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