140 THE AMERICAN CHARACIDAE. 
below the lateral stripe and on the cheeks. Anal and caudal dusky, a black 
stripe along the base of anal. 
11434 I. U. from Matto Grosso, British Museum have all of these mark- 
ings intense black, while in 10162 I. U. from Corumba they are exceedingly 
faint. 
2. HeEMIGRAMMUS COERULEUS Durbin. 
Plate 17, fig. 2. 
Hemigrammus coeruleus Durxrn, Bull. M. C. Z., 1908, 62, p. 99 (Manacapuru); ErcenmMANN, Rept. 
Princeton univ. exped. Patagonia, 1910, 3, p. 436; Exits, Ann. Carnegie mus., 1911, 8, p. 162 
(Manaos). 
Hasirat.— Amazon. 
Specimens examined. 
Number of 
Catalogue number specimens Size in mm. Locality Collector 
20801 Type 1 46 Manacapuru James 
20801 Paratypes 102 42-52 Manacapuru James 
3052 C. 3 49-58 Manaos Haseman 
Head 3.5; depth 2.75; D.11; A. 20-22; scales 5-31 to 32; eye 2.5 to 2.7 
in the head; interorbital equal to the eye. 
Compressed; depth of head at the base of the occipital process 1.5 in the 
greatest depth. Preventral region slightly rounded, median series of scales 
somewhat irregular, a broad scale occupying the whole space between the 
bases of the ventrals. Predorsal region broadly rounded with a complete 
median series of nine scales. 
Occipital process one eighth of the distance from its base to the dorsal, 
bordered by one and one half or two scales. Interorbital very slightly convex. 
Frontal fontanel triangular just half as long as the parietal without the occi- 
pital groove. Second suborbital leaving a narrow naked area behind and a 
slightly wider one below. Maxillary very slightly longer than the eye. Mandi- 
ble two in the head. Snout short, mouth large. Premaxillary with five, 5- 
pointed teeth in the inner row; and four or five less frequently two, conical 
or tricuspid teeth in the outer row. Maxillary with four or five sometimes 
two or three, tricuspid teeth. Dentary with four large teeth, a smaller one, 
and four or five minute conical ones on the sides. 
Gill-rakers 8 + 10. 
Caudal sealed halfway to the tips of the longest rays. Anal sheath con- 
sisting of about five scales and covering the base of the first ten rays. Lateral 
line with pores on the seven or eight scales. 
