112 THE AMERICAN CHARACIDAE. 
terizing another genus. This series should be compared with the series of M. 
sanctae filomenae. 
To complete the record I add the conditions in the specimens from Kona- 
waruk, Crab Falls, and Christianburg. 
Konawaruk is a short distance up the Essequibo from the mouth of the 
Potaro River, Crab Falls is a still shorter distance below the mouth of the Potaro 
and Tumatumari a few miles above the mouth of the Potaro at its first cataract. 
Lateral line of Moenkhausia cotinho. 
A. Crab Falls B. Konawaruk 
Left Right Left Right 
17+ 16 16+ 17 14+17 12+ 19 
16+ 15 10+ ? 18+17+3 12+ 21 
16+17 12 + 20 138+ 19 18+ 19 
15+ 18 14+ 19 12 + 20 11 + 20 
15+ 18 13+ 19 11+ 20 10 + 22 
14+ 18 138+ 18 
14+ 19 16+ 16 
14+17 13 + 16 
13+ 19 12 + 20 C. Christianburg 
12+ 20 13+ 18 Left Right 
12 + 20 12+ 21 16+10+3 10 + 21 
12 + 20 11+ 21 11+ 21 9+ 23 
12 + 20 ? ? +21 ? + 22 
10 + 22 11+ 21 9+ 24 9 + 23 
I have arranged the series from Crab Falls in regard to the pores in the 
line on the left sides. There is a regular gradation with an approximate but 
not complete correlation on the two sides of the body. 
