THE AMERICAN TETRAGONOPTERINAE. 163 
19. H®rMIGRAMMUS SCHMARDAE (Steindachner). 
Plate 20, fig. 2; Plate 78, fig. 1. 
Tetragonopterus schmardae STEINDACHNER, Flussf. Siidam., 1882, 4, p. 37, pl. 7, fig. 6 (Tabatinga); EraEn- 
MANN & EIGENMANN, Proc. U.S. N. M., 1891, 14, p. 54. 
Hemigrammus schmardae Fower, Proc. Acad. nat. sci. Phil., 1906, p. 333 (Peruvian Amazon); ErcEn- 
MANN & Oats, Proc. U.S. N. M., 1907, 33, p. 13; Eraenmann, Rept. Princeton univ. exped. Pata- 
gonia, 1910, 3, p. 486; Exuis, Ann. Carnegie mus., 1911, 8, p. 163 (Santarem). 
Tetragonopterus santaremensis UuREY, Ann. N. Y. acad. sci., 1895, 8, p. 283 (Santarem). 
Hemigrammus melanochrous Fowurr, Proc. Acad. nat. sci. Phil., 1913, p. 548, fig. 12 (Tributary of Rio 
Madeira near Porto Velho). 
Hasitat.— Amazons. 
Specimens examined. 
Catalogue Number of 
number specimens Size in mm. Locality Collector 
4 34+43 Manaos Agassiz 
5174 1. 1 28 Brazil 
5499 I. 2 29 Santarem Menot 
8085 C. 1 39 Santarem Hasemann 
Head 3.4-3.6; depth 3; D.11; A. 20-28; scales 5-30 to 34-3 to 3.5; 
eye large, 2.3-2.5 in the head; interorbital 3 in the head. 
Compressed; depth of head at the base of the occipital process 1.33 to 
1.5 in the greatest depth. Preventral region rounded, with complete median 
series of 10 or 11 scales. Predorsal region rounded, with complete median 
series of 9 scales. 
Occipital process 6 in the distance from its base to the dorsal, bordered 
by 2.5 scales on the side. Interorbital region almost flat. Frontal fontanel 
triangular to truncate triangular, equal to the length of the parietal without 
the occipital groove. Second suborbital leaving a very narrow naked margin 
behind and below. Snout short, mouth large. Maxillary and mandible both 
long and equal to the eye. Premaxillary with 5 teeth in the inner row, four 
large, 4- to 5-pointed, and one very small; three small tricuspid teeth in the 
outer row. Maxillary with two or three small conical or tricuspid teeth. 
Dentary with a graduated series of four large, 5-pointed teeth, one very small 
tooth and twelve or more minute conical teeth on the sides. 
Gill-rakers 7 + 9. 
Anal sheath short, consisting of 4 scales covering the bases of the first 5 
rays. Lateral line with pores on 7 to 16 scales. 
Origin of the dorsal very slightly nearer the snout than the caudal, penul- 
