390 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE L. 



Fig. L Pygidium guianense Eigenmann. Type, No. 1003, C. M., 77 mm., Arua- 

 taima Cataract. 



Fig. 2. Pygidium conradi Eigenmann. Type, No. 2212, C. M., 41 mm., Amatuk 

 Cataract. (The head is a little too short.) 



Fig. 3. Pygidium gracilior Eigenmann. Type, No. 1730, C. M., 27 mm., Erukin, 

 British Guiana. 



Fig. 4. Pygidium^ hasemani Eigenmann. Type, No. 5238, C. M., 15 mm., San- 

 tar em. 



Fig. 5. Pygidium iheringi Eigenmann. Type, No. 10785, L U. M., 161 mm., 

 Santos. 



