64 THE CYPRINODONTS. 
B.5; D. 10-9; A.10-9; V.6;'P.16; Ll. 29-31; Ltr. 9; Vert. 16--17. 
Depressed and wedge-shaped anteriorly, compressed behind the pectorals, 
depth greater than length of head; caudal pedicel deep. Head broader 
than deep, narrowing forward and below, slightly arched across the crown, 
one fourth or less of the length to the base of the caudal. Snout as long as 
eye, broad, subtruncate, wedge-shaped as seen from the side. Mouth wide, 
directed upward ; jaws weak, loosely joined, lower longer, upper shorter, 
protractile. Teeth slender in the outer series, movable, narrowed at the 
bases, broader and oar-shaped toward the apices, hooked ; inner teeth in a 
band, very small, one cusped or with slight indications of lateral cusps; 
pharyngeal very slender, the series arranged in short rows of three to seven. 
Eye large, about half of interorbital space, as long as snout, one fourth of 
head. Dorsal origin little in advance of the middle of the total length, 
slightly behind that of anal in females. Anal of male farther forward, 
between the ventrals, second to fifth rays modified to form an intromittent 
organ, not as long as the head, with a fleshy lobe below the apex. Ventrals 
small, second ray elongate in males. Pectorals rather elongate, reaching 
behind the bases of the ventrals. Caudal deep, median rays as long as the 
head, posterior border forming a very blunt angle or rounded. Scales large. 
Intestine long. 
Light yellowish to brownish or olivaceous, lighter below, silvery on cheeks 
and flanks, edges of scales darker. With or without narrow vertical bands 
of darker separated by spaces of similar width on the flanks, more distinct 
posteriorly. Top of head darker, with a lighter spot in the centre. With or 
without a darker vertebral line. Fins tipped with darker, or plain. Dorsal 
in cases darker near the base. Caudal sometimes with faint indications of 
transverse bands. Smaller specimens have transverse series of small spots, 
on the interradial membranes, on dorsal and caudal, the spot at the bases of 
the third and fourth rays of the dorsal being blackest. 
Females up to four and one half inches ; males much smaller. 
Panama. 
Peecilia amazonica sp. n. 
Plate IV. Fig. 9, teeth. 
B.5; D.6; A. 9-8; V.6; P. 18; Ll. 26-28; Ltr. 7-8; Vert. 15+15. 
Closely allied to P. wixipara, but distinguished by a smaller dorsal and by 
the position of the lateral spot, present on the young. Head one fourth of 
