THE AMERICAN TETRAGONOPTERINAE. 171 
iridescence, the last few on the end and middle of the caudal peduncle rich 
copper. In life adipose yellow and dorsal yellowish. 
25. HeMIGRAMMUS ANALIS Durbin. 
Plate 22, fig. 2. 
Hemigrammus analis Dursin, Ann. Carnegie mus., 1909, 6, p. 64 (Rockstone); EIGENMANN, Rept. 
Princeton univ. exped. Patagonia, 1910, 3, p. 436; Exxis, Ann. Carnegie mus., 1911, 8, p. 163 
(Santarem); Ercenmann, Mem. Carnegie mus., 1912, 5, p. 337, pl. 49, fig. 6. 
Hapitat.— British Guiana. 
Specimens examined. 
Number of Size 
Catalogue number specimens in mm. Locality Collector 
1466 C. Type 1 35 Rockstone Eigenmann 
1468 C., 11919 I. 21 24-29 Gluck Island Eigenmann 
Paratypes 
1467 C., 11918 I. 72 19-36 Rockstone Eigenmann 
Paratypes 
1469 C., 11920 I. 2 29, 35 Wismar Eigenmann 
Paratypes 
1 30 Santarem Haseman 
Head 3.5-3.75; depth 3.25-3.50; D.11; A.12-14; scales 5-30 to 32-3; 
eye 2.33 in head, snout 1.5 in the eye, interorbital less than the eye, about 
2.75 in the head. 
Compressed; depth of head at base of occipital process 1.33 in the greatest 
depth. Preventral region rounded, without regular series of median scales. 
Predorsal region rounded, having a regular median series of 8 scales. 
Occipital process 5 in the distance from its base to the origin of the dorsal, 
bordered by 2 or 3 scales. Interorbital flat. Frontal fontanel small, triangu- 
lar, narrower than the parietal, half the length of the parietal without the 
occipital groove. Second suborbital leaving a narrow naked margin below and 
behind. Snout short. Mouth large. Maxillary not so long as the eye. 
Mandible equal to the eye. Premaxillary with three or four 5-pointed teeth 
in the outer row, and five, 5- to 7-pointed teeth in the inner row. Maxillary 
with two or three 6- to 7-pointed chisel-shaped teeth. Dentary with four 
broad, 7-pointed teeth, followed by three or four minute teeth on the sides. 
Gill-rakers about 6 + 9. 
Caudal sealed halfway to the end of the longest rays. Anal sheath of 3 
