FROM THE RIO PARAGUAY. 



PLATE VI. 



Chcetostomus gigas, -f nat. size, with upper and lower views of head (^): p. 30. 



PLATE VII. 



Fig. 1. Loricaria labialis: p. 32. 



1 a, upper, 1 b, lower view of head and anterior part of body. 

 Fig. 2. Loricaria apeltogaster : p. 33. 



2 a upper, 2 b, lower view of head and anterior part of body. 



PLATE VIII. 



Fig. 1. Loricaria parva, with enlarged upper (a) and lower (b) views of head: p. 32. 



Fig. 2. Tetragonopterus ternetzi: p. 35. 



Fig, 3. Tetragonopterus ulreyi : p. 35. 



Fig. 4. Anacyrtus prognathus : p. 36. 



