OCT., 1907. FRESH-WATER FISHES MEEK. 139 



lower, cooler stratum that these fishes are found. Mr. Smith of Ohio 

 University caught a lot of these fishes one day and placed them in the 

 hot water of the spring. All of them were killed soon after striking 

 the hot water. These fishes are abundant in the warm water near 

 springs, where they feed on the abundant algae there. It is doubtful 

 if they ever for any length of time endure a temperature of more than 

 100 F. In Guatemala City I was unable to secure a thermometer 

 which would register over 110 F. and so was unable to take the tem- 

 perature of these springs. In many places near the springs one could 

 quickly plunge his hand into the water and easily demonstrate that 

 the surface water was too hot for comfort, while the temperature of 

 the water beneath was not much warmer than that out in the lake. 

 The water in the spring was warm enough to scald chickens, and it 

 would cook eggs soft in about 6 to 8 minutes and fairly hard in about 

 15 minutes. In water of this temperature, and even much cooler, 

 fishes could not live. 



Some time since I asked Mr. Regan to examine the types of the 

 several apparently nominal species described by Dr. Gxinther. This 

 he kindly did, and in arranging the synonymy above I have not de- 

 parted much from the results of his study of this species. The family 

 to which this species belongs is being monographed by Mr. Regan. 



El Rancho (85), 29 to 53 mm.; Lake Amatitlan (200), Lake Atit- 

 lan (100), 40 to 95 mm.; San Jose del Idolo (40), 55 to no mm.; 

 Caballo Blanco (21), 50 to 90 mm. 



Family Atheriiiidtt'. 



Thyrina meeki Miller. 



A few individuals of this species were taken in the current of the 

 Rio Motagua at El Rancho. 



El Rancho (15), 40 to 95 mm. 



Family Mugiliclas 



Agonostomus monticola (Bancroft). TRUCHA. 



This species is quite common in clear, swift, rocky streams, many 

 can be seen among the boulders but their capture is difficult. 



San Jose del Idolo (i), 82 mm. 



