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17 be listed as of special concern or threatened. C. baileyi ssp.: Mormon White River Springfish This subspecies is confined to the Mormon Spring and Hot Creek Springs in the southern portion of the White River Valley. The Mormon Spring population is currently the only habitat without exotic fish and is in excellent condi- tion. However, the system is currently being used by livestock and should be monitored to assess the impacts. The population at Hot Creek is in jeopardy as a bass was observed above the fish barriers in October of 1979. Personnel of the Nevada Department of Wildlife were contacted about this matter and steps are being taken to eliminate the exotic. State protection of this habitat has led to increased populations, so no further recommendations are made. Cyrpinodon diabolis: Devils Hole pupfish This species is currently being maintained in an artificial habitat below Hoover Dam. The population has experienced a steady decline over the past several years and is maintaining only about 60 individuals. Plans are currently underway to rehabilitate this habitat in an effort to stimulate population increases. Empetrichthys latos latos: Pharump killifish This is one of two populations of the killifish that is currently being maintained outside of its native drainage. This species as well as all other members of the genus have been exterminated in their natural habitats. Popula- tion estimates at Corn Creek in October, 1979, indicate that there are approxi- mately 2500 fish present in the three ponds. There are an unusual number of Rana catesbeiana in this system, and measures should be taken to control them and assess their influence on the killifish. Attempts should be made to reintroduce this species back into its natural habitat. Gila robusta jordani: Pahranagat Roundtail This subspecies is currently confined to a small section of stream below the outflow of Crystal Springs. The animal is extremely rare, with less than 500 individuals still surviving. The habitat has been reduced in recent years, and there are a large number of exotics in the remaining habitat. Life history studies are currently underway at the University of Nevada at Las Vegas and by personnel in the Nevada Department of Wildlife. Establishment of a refuge and the purchase of the remaining habitat are top priorities. Failure to take appropriate action in the immediate future could lead to the extinction of this subspecies. G.r. seminuda: Virgin River Roundtail The subspecies is found throughout the Virgin River, although only sporadically abundant. Collections over the past several years indicate a need for deep pool habitats in this river system. Serious threats are being imposed by the development of the Allan-Warner Valley water project, desalini- zation plants, and agricultural diversions. This subspecies should be listed as threatened and further studies undertaken to determine its life history. G.r. ssp.: Moapa River Roundtail This undescribed subspecies in the Moapa River has received little atten- tion from investigators other than noting its occurrence in this river. The