124 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
maxillary not quite extending to orbit. Gillrakers 66 on first arch, close together, slender', the length 
of longest half diameter of orbit. Teeth 4-4, strong, hooked, grinding surface oblique, narrow, grooved ; 
a notch just below the hook. Alimentary canal almost twice length of body. Peritoneum dusky. 
Scales not crowded anteriorly, evenly distributed over the body; lateral line shaped like the 
ventral contour of body, except above pectoral fins, where it is sharply decurved. Dorsal inserted 
directly above ventral, first ray highest, nearly three times height of last; when depressed the fiu is 
falcate ; when elevated, its edge is concave ; anal similar in shape ; caudal deeply forked, the tips sharp ; 
ventrals pointed, not reaching vent; pectorals slightly rounded. 
Color silvery, darker above, especially on median dorsal area, where a more or less definite dusky 
band extends the length of body; rays of dorsal fin and tips of caudal dusky; lower fins white. 
Exact measurements of the only specimen obtained are here given. Length of body in 92 mm. ; 
depth of body expressed in hundredths of length 23; depth of caudal peduncle 11+ length of head 
284; width of interorbital space 114; length of snout 8; diameter of orbit 6; distance from snout to 
dorsal fin 52; height of longest dorsal rays 20; distance from snout to anal fin 73; height of longest 
anal rays 17; distance from anal to caudal fin 21; length of caudal fin 25; length of pectoral fin 18; 
distance from snout to ventral fin 53; length of ventral fin 16. 
FALCULA Jordan & Snyder, new genus. 
Type, Falcula chapalce new species. Body long, compressed; caudal peduncle slender; mouth 
large; lips thin; premaxillary protractile. No barbel. Teeth in 1 row, 4-4, hooked; grinding surface 
grooved. Gillrakers few, short, far apart. Alimentary canal short. Peritoneum silvery. Lateral 
line complete. Scales rather small, about 50 iu lateral series. Fins high, falcate; dorsal inserted 
directly over ventrals ; anal basis short; first simple rays of dorsal and anal rudimentary and closely 
adnate to first branched ray, caudal long, deeply notched. 
The genus Falcula is related to Notropis, from which it differs in its small scales and in its very 
high, falcate fins. 
13. Falcula cliapalae Jordan & Snyder, new species. Fig. 6. 
Type No. 6152, L. S. Jr. Univ. Mus. Collected by J. O. Snyder, at Laguna de Chapala, near 
Ocotlan, Jalisco, Mexico, December 26, 1898. 
Head 4 in length; depth 4.50; eye 3.66 in head; snout 3.66; interorbital space 3.66; depth 
of caudal peduncle 9.5 in length; height of dorsal 4; anal 5; length of pectoral 4.80; ventral 5.75; 
caudal 3.25; number of scales in lateral line 50; between dorsal and occiput 19; between dorsal and 
ventral fins 16. D. 8. A. 8. P. 17. 
Body long, slender, compressed; snout pointed; its length equal to diameter of orbit or to inter- 
orbital space; month almost horizontal, its cleft extending to a vertical from anterior edge of orbit; 
lips thin. Teeth 4-4, strong, slightly hooked, the hook barely evident on lower tooth; three upper 
teeth with a. grooved grinding surface. Gillrakers 3+7, short, pyramidal, and far apart. Alimentary 
canal short. Peritoneum silvery. Lateral line complete, decurved to a point in a vertical midway 
between pectoral and ventral fins, whence it extends in a straight line a little below middle of body 
to caudal. Fins all very high and pointed ; dorsal inserted directly over origin of ventrals, falcate when 
depressed, its second ray longest; anal similar in shape; inserted at a point two-thirds the distance 
