PLATE XX 
Fia. 1. Orestias elegans Garman, 15238, part, 95 mm., L. Chinchaycocha. 
Fia. 2. Orestias empyraeus Allen, sp. nov. 15238, part, 120 mm., L. Chin- 
chaycocha. 
Fias. 3-8. Orestias agassizii Valenciennes. Fig. 3, the largest, 120 mm., 
Puno, L. Titicaca; fig. 4, dorsal aspect; figs. 5-7, juvenile, 
showing variation in color; fig. 8, about 90 mm., metamor- 
phosis to adult form. 
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