246 MEMOIRS OF THE CARNEGIE MUSEUM 
? Rhamdia lateristriga Rrpetro, Fauna Bras., Peixes, IV, 1912, p. 271 (Calderao, 
Amazonas). 
Habitat.—Amazon Basin; especially eastern Brazil from the Rio Sao Francisco 
to Rio de Janeiro. 
A number of references to the name lateristriga have been distributed among 
the species to which they actually belonged. 
Of this species there appear to be specimens from the Rio Sao Francisco: 
6982a-e C. M., 37-85 mm., Penedo, near mouth of the Rio Sao Francisco, March 
20, 1908. Haseman. 
6983a-c C. M., 45-55 mm., Joazeiro, Nov. 28, 1907. Haseman. 
6987a—c C. M., 71-82 mm., Lagoa Pereira, Dec. 23, 1907. Haseman. 
and specimens from the Rio Parahyba: 
698la C. M., 60 mm., Sdo Joao da Barra, June 23, 1908. Haseman. 
6984a-d C. M., 70-95 mm., Campos near the mouth of the river, June 15, 1908. 
6985a C. M., 72 mm., Lagoa Feia, a swamp on a sugar plantation south of the 
mouth of the Parahyba. 
From the Rio Itapemerim we have the following lot: 
6986a-f C, M. 60-71 mm., Muniz Freire, June 18, 1908. Haseman. 
Of the above No. 6981 has the barbels extending to the middle of the base of 
the anal. The pectoral spine is equal to the head less the opercle and has 11 
teeth on the basal three-fourths of the spine; the teeth are graduated from the 
second, which is longer than the spine is wide. Width of occipital process 4.5 in 
the length; caudal 4 in the length; lateral band faint. With this 6984 and 6985 
agree in almost every particular; the lateral band is sometimes conspicuous, con- 
tinued on both head and caudal. Those nearest them in the character of pectoral 
spines are 6986. The barbels extend to near the tips of the ventrals or a little 
beyond them. The pectoral spine is equal to the snout and eye and has 6-8 teeth 
on the basal two-thirds of the posterior face; the teeth are graduated from the 
last, or the one next to the last, and the longest is greater than the width of the 
spine; width of occipital process 3-4 in its length; lateral band well defined, con- 
tinued on head and caudal. | 
In 6982 and 6983 the maxillary barbel extends to the middle of the base of 
the anal or beyond, on one side of one individual approaching the caudal. The 
pectoral spine is equal to the snout and eye, plus or minus, and has 9 or 10 spines 
in 6983 and 11-14 in 6982; teeth not as wide as the spine, on the basal half or two- 
thirds of the posterior face. In the smallest they are graduated from the tip to 
