THE AMERICAN TETRAGONOPTERINAE. 119 
Specimens examined. 
Number of 
Catalogue number specimens Size in mm. Locality Collector 
20692 Cotypes 24 about 65-87 Goyaz Honorio 
3748 C. 19 21-62 Villa Bella Haseman 
3749 C. 45-48 Aleoboca Haseman 
3750 C. 44 Rio Mamoré Haseman 
Distinguished by its short head, small fins. Head 4.5-4.66!; depth in 
males and spent females about 3, in females with eggs 2.66-2.8; D. 10-11; A. 
20-23. Scales 5; or 6-38 to 41-4 above ventrals or anal. Eye 3 (rarely more, 
to 3.5); interorbital equals eye. 
Elongate, rather heavy; dorsal profile slightly depressed at the nape; 
ventral profile more strongly arched than the dorsal; preventral area rounded, 
postventral area more narrowly rounded; predorsal area rounded, with a median 
series of about twelve scales from the dorsal to within one scale of the occipital 
crest. 
Occipital process very short, not reaching one ninth the distance from its 
base to the dorsal, bordered by two scales on the side; frontal fontanel very 
short; suborbital covering the entire cheek; snout pointed, maxillary not much 
longer than snout, three and three tenths in head; mandible two and a half 
in head. Four or five teeth in the front row of the premaxillary, the first further 
forward than the rest, the second and fourth, or second and third, sometimes 
withdrawn from the line; only four in the second row; two or three teeth on 
the maxillary; lower jaw with four graduated teeth and a few small similar 
ones on the side. 
Gill-rakers very short, one fourth the diameter of the eye, 6 + 10. 
Seales regularly imbricate, thin, adherent, with about six feeble striae; 
anal sheath of a single row of scales; caudal lobes, with minute scales for about 
1 Ten specimens selected at random, have the following 
spent 10 20 6-414 
D. A Scales Depth Eye 
2 with eggs 10= (93) 21 5.5-38-4 2.66 3 
Shes oe ae 10 21 6-414 2.66 3.3 
Ott nes 11 = (103 21 6-39-4 2.8 3.2 
Ops oS 10 22 5-40-4 2.15 3 
eas as 10 20 5.5-39-4 .66 3 
fol 10 23 5.5-36-4 .86 3.5 
g all 3 
fou 3 
©) 3 
ros 3 
