THE AMERICAN TETRAGONOPTERINAE. 207 
Specimens examined. 
Catalogue Number of Size 
number specimens in mm. Locality Collector 
20699 7 43-61 Maldonado TG. Cary 
9996 I. 5 15-31 Arroyo Trementina Anisits 
11260 I. 6 23-29 Colonia Gonzales Anisits 
10294 I. 9 31-44 Puerto Max? Anisits 
9994 I. 41 25-40 Arroyo Pypucu Anisits 
4890 I. 3 53-65 Rio Grande do Sul Von Thering 
3047 C. 58 25-69 Campos Haseman 
3041 C. 66 31-69 Porto Alegre Haseman 
3042 C. 11 40-54 Lagoa Feia Haseman 
3006 C. 9 26-48 Cacequy Haseman 
3005 C. 13 38-49 Muniz Freire Haseman 
2934 C. 1251 19-60 Jacarehy Haseman 
2933 C. 4 12-19 Jacarehy Haseman 
3073 C. 1 45 Arequa, Paraguay Haseman 
3074 C. 2 41-51 Sapucay, Paraguay Haseman 
2950 C. 6 40-48 Sao Joao da Barra Haseman 
Head 3.8-4.4; depth 2.35-2.6; D. 11; A. 20-26; scales 5 or 6-30 to 35- 
4 or 5; eye 2.75 in the head, equals the interorbital. 
Compressed, deepest at the vertical from the origin of the dorsal. Depth 
of head at the base of the occipital processes 1.87 in the greatest depth. Preven- 
tral region rounded, without complete median series of scales. Predorsal region 
rounded, with complete median series of 9 or 10 scales. 
Occipital process about 6 in the distance from its base to the dorsal, bor- 
dered by 3 scales. Interorbital convex. Frontal fontanel triangular, two thirds 
of the parietal without the occipital groove. Second suborbital leaving a 
naked margin sometimes equal to one third of its width, behind and below. 
Maxillary three in the head. Mandible equal to the eye. Premaxillary with 
five 5- to 8-pointed teeth in the inner row and two to four, usually three, 5- to 
7-pointed teeth in the outer row. Maxillary with two, rarely three, large, 
6- to 9-pointed teeth. Dentary with a graduated series of six or seven large, 
6- to 8-pointed teeth or the last one only 5-pointed and about half the height 
of its immediate predecessor. Beyond these is one small 4-pointed tooth which 
is about one fourth of the smallest of the continuous series. 
Gill-rakers 13 + 7. 
Anal sheath short, consisting of 7 scales and covering the bases of the first 
8 rays. Lateral line having pores on 5 to 20 scales.' 
1In three specimens of 2934 C M. the lateral line is complete; out of nine specimens of 3006 C. M. 
one 32 mm. long the line is complete; of 3042 two specimens the lateral line is nearly complete and one 
has it interrupted 25 + 1 + 7 on one side and 17 +2+2+5+3 +5 on the other. 
