1878.] 687 [Cope. 
the anterior part of the latter is a large black spot which is situated nearer 
the opercular fissure than the line of the first dorsal ray. An indistinct 
black spot at the base of the caudal fin. Total length M. .220; of head 
025 ; to base of ventral fin (axial) .075 ; do. of dorsal fin (axial) .088 ; do. 
to origin of anal .115. 
Coll. 1877. 
64. XIPHORHAMPHUS ABBREVIATUS, sp. nov. 
Form stout and robust, the depth of the ventral fin entering the length 
minus the caudal fin three and a half times. Length of head entering 
the same about three times. The muzzle is relatively short, being 
only one and a half times the length of the long orbit. This enters the 
head 4.75 times, and the flat interorbital space 1.5 times, which there- 
fore equals the length of the muzzle. There are two distant large ca- 
nines on the anterior part of the maxillary bone and four smaller ones ; the 
maxillary teeth are minute. There are two distant canines on the premax- 
illary, and four large ones on the dentary, with a terminal tooth of small 
size. The maxillary is covered for its entire length by the preorbital, and 
extends to a half orbits diameter behind the posterior border of the orbit. 
Radial formula D. I. 10; A. IT. 21; V. 8; P. 16, reaching base of ven- 
trals, which reach vent. Dorsal fin elevated, equaling length of head with- 
out muzzle, originating behind line of ventrals, and terminating just in 
front of line of first anal ray. Scales 25-90 + 8-10, smooth, those of the 
lateral line not longer than the others. Breast below shoulder girdle, keeled. 
Color silvery bluish, with a wide paler shade along the side; a black 
humeral and basal caudal spot. Fins immaculate, pectorals and: ventrals 
dusky. Total length M. .212; of head .038; to origin of ventrals (axial) 
-090; do of dorsal .109 ; do. of anal .130. 
Coll. 1873-1877. 
65. XIPHORHAMPHUS HETEROLEPIS, sp. nov. é 
An elongate species in which the depth enters the length with the caudal 
fin six times, and the head enters the same three and six-tenth times, or 
three and three-tenth times without the caudal fin. The muzzle is nar- 
rowed and convex above, and ig not so long as from the anterior border of 
the orbit to the preopercular border. The dorsai fin is in the posterior 
part of the second third of the length (without caudal fin). Formula; D. 
J. 10; A. II. 25; V. 8; P. 15, reaching more. than half way to ventrals, 
which extend half way to vent. Scales very small, those of the lateral line 
larger than the others, and crossed by a vertical ridge beyond their middle : 
formula 38—121-+48—23. 
The diameter of the bony orbit enters the head 5 times, and the inter- 
orbital space 1.25 times. The front and ethmoid region exhibit a few 
longitudinal ridges, and there is no rugosity on the epiotics. There are 
two foramina for the accommodation of two inferior canine teeth on each 
side. Total length M. .360. The first suborbital bone behind the preor- 
bital, is narrow. Color silvery, on the side golden; a basal caudal, no 
humeral spot. 
Several specimens: colls. of 1873-77. 
