EIGENMANN: PIMELODELLA AND TYPHLOBAGRUS Pa 
6933a C. M., 127 mm., San Joaquin, Bolivia, September 4, 1909. Haseman. 
6934a C. M., 131 mm., Villa»Bella, Oct. 5, 1909. Haseman. 
6936a-f C. M., 77-220 mm., Santarem, Dee. 8, 9, 1909. Haseman. 
6937a-e® C. M., 85-258 mm., Maciél, Rio Guaporé, July 23, 1909. Haseman. 
222? Field M., 94 mm. to base of caudal, Serra da Lua, near Boa Vista, Amazon. 
M. P. Anderson and R. N. Becker. 
7586a M. C. Z., 154 mm., Rio Puty, Paranahyba basin. Thayer Expedition. 
7475a° M. C. Z., 232 mm., Coary. Thayer Expedition. 
7492a’ M. C. Z., 265 mm., Tapajos. Thayer Expedition. 
7541a-b M. C. Z., 127 and 152 mm., Sao Gongallo. Thayer Expedition. 
7412a-d* M. C. Z., 232-305 mm., Santa Cruz, Rio Mucuri. Thayer Expedition. 
744409 M. C. Z., 300 mm., Villa Bella. Thayer Expedition. 
7576a—b" M. C. Z., 66-103 mm., Ica. Thayer Expedition. 
7569a" M. C. Z., 95 mm., Hyavary. Thayer Expedition. 
3. Pimelodella steindachneri nom. nov. 
Pimelodella wesselii K1GENMANN & EIGENMANN (non Steindachner), Proc. Cal. 
Aead. Sei. (2), Vol. I, 1888, p. 182 (Cudajas; Pard; Marajo; Rio Madeira; 
Rio Puty; Santarem); Occasional Papers, Cal. Acad. Sci., I, 1890, p. 152; 
EIGENMANN, Rep. Princeton Univ. Exped. Patagonia, III, 1910, p. 389. 
Habitat—Amazon Basin. 
The species described by Steindachner as P. wesselii from the Essequibo is 
identical with P. cristata (Miiller & Troschel) from the same place. It is doubt- 
ful whether the specimens enumerated by E. and E. in the papers quoted above 
belong to the same species, and they are here set apart under a new name. The 
species, if distinct, is very closely related to P. gracilis and P. cristata. Its caudal 
is more like that of gracilis. Its maxillary barbel is longer than that of cristata. 
5 Maximum number of pectoral thorns 30. 
® Pectoral thorns 24, 
7 Pectoral thorns 22. 
8 q, 232 mm., pectoral thorns 25, upper caudal lobe 39 mm., lower 44, maxillary barbel to end of 
base of anal. 6. 262 mm., pectoral thorns 24, upper caudal lobe 52 mm., lower 51, maxillary barbel 
to middle of base of anal. c. 300 mm., pectoral thorns 32, caudal broken, maxillary barbel not to origin 
of the anal. d. 305 mm., pectoral thorns 29, upper caudal lobe 57 mm., lower 60 mm., maxillary barbel 
beyond tip of anal. 
9 Pectoral thorns 25, upper caudal lobe 45 mm., lower lobe 55 mm., maxillary barbel to middle of 
base of anal. 
10 Pectoral thorns 14 and 11, maxillary barbel beyond base of anal in the larger specimen, to near 
tip of the caudal a in the smaller. 
4 Pectoral thorns 17, maxillary barbel extending beyond caudal. 
