3152 . Bulletin 4.7, United States National Museum. 



teeth firmly attached and in a single series. Its actual affinities are with 

 the genus Goodca, and it belongs to the subfamily Goodeinw, which has the 

 general characters of the Pocciliincv, but with bifurcate or trifurcate teeth, 

 and no great diifereuces bet ween the sexes. (?^o5, strange; tv36v, within.) 



100S (b). XEXEXDOI ( ALIENTE, Jordan & Snyder. 



Head 3f ; depth 2f; depth of caudal peduncle 5f; eye 4 in head; snout 

 3; interorbital space 2; height of dorsal 5| in length; anal 6f; length 

 of pectoral 5; ventral 7|; caudal 5; D. 13; A. 14; scales 36, in transverse 

 series counting upward and forward from origin of anal, 14; 011 caudal 

 peduncle, 9. Body large and thick set, deepest at tip of pectoral ; width 4f- 

 times in length; head pointed; interorbital space broail, slightly convex; 

 length of snout about equal to diameter of orbit; mouth vertical, its 

 width equal to length of snout; maxillary very protractile; teeth loosely 

 attached, in 2 series, those of the first series larger, flat, and notched, in 2 

 rows on upper jaw, 3 rows on lower, the individual teeth of each row alter- 

 nating in position with those of the next, those of the second series very 

 minute, in a villiform baud; gill-opening not restricted, extending above 

 the pectoral a distance equal to diameter of pupil; gill-rakers long, slen- 

 der, and close together, 40 on first arch. Alimentary canal long (in one 

 specimen 44- times the length of body), coiled many times; peritoneum 

 black; genital opening close to base of anal, covered by a thick, notched 

 pad. Dorsal fin inserted posteriorly, rounded, the base short, its length 

 less than height of fin; anal inserted under dorsal, first 5 rays crowded 

 together and shortened; edge of fin double-convex, the notch being 

 between the shorter and longer sets of rays; pectorals and ventrals with 

 rounded edges; caudal evenly rounded; body and head everywhere, 

 except jaws and preorbital area, with scales; no lateral line. Color light 

 olive, growing darker above; medium dorsal area blackish, each scale 

 with a dark, angular band, those of the sixth series below the dorsal 

 darker, making an indistinct, narrow lateral band; all the fins, except 

 ventrals, dusky. 



The females differ but slightly from the males. The body is more 

 thick set, the caudal peduncle a little less deep, the tins a little lower, and 

 the anal evenly rounded. The young are somewhat mottled in color. 



Xenendum caliente differs from X. luitpoldii in having fewer scales in the 

 lateral and transverse series and on the caudal peduncle, and in a similar 

 way from X.xallscone, besides having villiform teeth, which are absent in 

 X. xaliscone. (Jordan &, Snyder.) 



Known only from Rio Verde, near Aguas Calientes, Mexico. (Type, a 

 female, No. 6147, L. S. Jr. Univ. Mus. Coll. J. O. Snyder.) 



Xenendum caliente, JORDAN <fc SNYDER, Bull U. S. Fish Com. 1899 (1900), 127, Rio Verde, 

 near Aguas Calientes, Mexico. 



Characodon luitpoldii, Steindachner (p. 2832) belongs to this new genus, 

 and should stand as 



1008 (b). XEXEXDCM LUITPOLDII (Steindachner). 



