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<br />rftk <br />380 Robert Rush Miller <br />first; some of the endangered forms are covered elsewhere in this re- <br />port. stumptooth minnow.-This unique <br />Stypodon sxgnifer Garman, <br />genus and species was described from 2 specimens collected in 1880 in <br />a spring on the Chihuahuan Desert near Parras, Coahuila, Mexico <br />(Fig. 1) It is characterized by having disbluny tinctivel need a dreduced <br />geal arches with the teeth mol ro orm to pees I am aware of only one <br />to only 3 on each arch. Aside from then served specimens) taken by <br />collection (USNM `)0971, 4 presumably from the type locality. In <br />George Hochderfer in 1903, p <br />May 1953, Carl L. and Laura C. Hubbs made a determined obeffort to <br />tained <br />obtain the species but were unsuccessful. All testimony the obtained immedi- <br />ate that there no longer are any natural springs in <br />ate vicinity of Parras or anywhere in the Parras basin or in the great <br />desert basin to the north. Thntoothe of the lava springs has been increased <br />from which they issue, <br />or maintained by tunneling <br />but the flow is concentrated into ,from which it is . The diverted <br />on- <br />- <br />through ditches into a cotton mill and onto fields r con- <br />stream <br />affec ains carp. The tic sewage. These modifi at onslof tthethabitat have <br />t <br />trial and domes <br />probably been responsible for the eliminntiidoonrothis g psties, aw ( as see well <br />ell <br />be- <br />as Dionda episcopa punctifer and Cyp <br />low). <br />ncti er (Garman), Parras roundnose minnow. <br />Dionda episcopa pu f <br />This fish was described, as Hyb athus (Dionda) punctifer, from ? <br />, near material collected ; es in the badsiu of t spring e Rio San Jualno Coahuila, tributary <br />Mexico; the latter Carl L. and Laura C. <br />of the lower Rio Grande. As determined by <br />Hubbs, the Parras population is extinct. It may have ve re re lepresented a <br />explana- <br />sentedlocal form belonging to the D. episcopa complex. A plausib <br />given above. <br />tion for the disappearance of this fish from Parras is iv spined ode:- <br />Lepidomeda altivelis Miller and Hubbs, Pahranag <br />This recently described species inhabited the outflow of Ash Spring <br />and the chain of lakes in Pahranagat Valley, Nevada, into which <br />these waters flow. The species was first collected in 1891 and became <br />and com- <br />extinct between 1938 an species lare?believed to have beenaresponsible <br />petition with introduced 28). <br />for its extermination (Miller and H 1960, pp. <br />and H 27-ubbs, Big Spring <br />Lepido'?neda mollispinis pratensis <br />