Dec. 28, 1916. Fisaes of PANAMA— MEEK AND HILDEBRAND. 313 
rounded, not much longer than interorbital width; origin of anal slightly 
in advance of gill-opening, its longest rays equal to or a little shorter 
than snout; pectoral fins equal to half length of head. 
Color uniform brownish, without dark punctulations; a very distinct 
yellowish stripe on median line of snout and back, disappearing at origin 
of dorsal filament. Fins unmarked. 
Of this species only a single specimen was secured, measuring 126 
mm, in length. It was taken in the Rio Grande, tributary of the Rio 
Tuyra, several miles above Cana. Several others were seen, floating 
down stream after a discharge of dynamite, but before they could be 
reached they had apparently recovered from the shock and quickly 
disappeared. 
We compared our specimen with several from the Rio Cauca, at 
Cali, Colombia, and found them to be identical. 
Order III. Haplomi. 
| THE PIKE-LIKE FIsHEs. 
Body elongate; scales cycloid, extending on head; lateral line 
wanting; fin rays soft; dorsal fin single, placed posteriorly; ventral fins 
abdominal. Opercles well developed; mesocoracoid absent; hyper- 
coracoid and hypocoracoid separate; pharyngeal bones distinct. 
Family VIII. Poeciliidz. 
Tue KILLirIsHEs. 
Body oblong to more or less elongate; depressed anteriorly, com- 
pressed posteriorly, covered with rather large cycloid scales; head usually 
flat above; mouth protractile, bordered above by the premaxillaries; jaws 
with teeth, incisor-like to villiform; gill-membranes more or less con- 
nected, free from the isthmus; gill-rakers short and thick; dorsal fin 
single, of soft rays only; ventral fins abdominal; caudal fin usually 
rounded or truncate. 
The species of this family are very numerous; some of them are 
viviparous. Those which occur in the area under consideration in 
this work are all viviparous, except the ones belonging to the genus 
Rivulus. 
Mr. Regan of the British Museum has lately revised the subfamily 
Peciliine, basing his classification of the genera on the modified anal 
