ART. 7 NEW SIAMESE FISHES SMITH 45

46 PROCEEDINGS

OF

THE NATIONAL MUSEUM

^VOL.79

Chao Phya

at

Paknam,

Central Siam,

August

16, 1924,

and

a speci-

men

8.5 cm. long

from

the

Chantabun

River at

Lem

Sing, South- eastern Siam,July 17, 1928.

CRYPTOCENTRUS LEONIS. new species

Description.

— ^Body

^elongate, moderately compressed, the greatest depth (at origin of first dorsal fin) contained 6 times in standard length; head large, rather deeper

and

broader than body, its length 3.3 in standard length, depth

and

breadth equal; profile between eyes

and

dorsal fin straight

and

nearly horizontal, anterior profile very steep, almost vertical; snout blunt, its length

somewhat more

than diameter of eye;

mouth

large terminal, slightly oblique, lips thick

and

papillose_;

gape

extending to a point

under

posterior part of eye

and

maxillary reachinghalfan eye-diameter

beyond

a vertical

from

posterior

margin

of orbit; teeth in a

band

in each jaw, the outer

row

enlarged but not canine; anterior nostril in a long tube

;

Figure^{21.^}

—

Cryptocentrus leonis

chin rounded

and

prominent, cheeks tumid; eyes prominent, situ- ated at the junction of the superior

and

anterior profiles, very close together, diameter of eye 0.5 length of head; interorbital space nar- row,lessthan0.5eye; depthofcaudal peduncle0.5itslength

and

con- tained 3 times in head; scales cycloid, minute,

somewhat

larger posteriorly, about 125 in longitudinal series

from upper

angle of branchial aperture, about 30 in transverse series between origins of second dorsal

and

anal; pectoral base naked; breast covered with small,

embedded

scales_; predorsal region scaled to a point half

way

between gill opening

and

eyes, the scales small, about 35 in

median

line; opercles

and

cheeks unsealed.

Fins: Dorsal rays VI-I,10; anal rays 1,9; first dorsal rather high, anterior spines longer than depth of body, the tips slightly produced; second dorsal similar to anal but its base longer; pos- terior rays of both second dorsal

and

anal the longer

and

reaching caudal

when

depressed; caudal large, broad, pointed, its length exceeding head; ventrals rather broad, rounded, not reaching vent, theirlength

somewhat more

than postorbital part of head_; pectorals shorter than ventrals, their base fleshy.

AiiT.7

NEW SIAMESE

FISHES

SMITH 47

Color: Entire

body

^a

uniform

reddish-brown without

any mark-

ings;

head

a

somewhat

lighter

and

richer brown, with cheeks

and

opercles traversed

by

about 8 narrow, oblique, widely separated dark

brown

stripes extending

downward and

forward, these stripes

margined by

a lighter

brown

than on the interspaces; a

few dark brown

spots on

upper

lip

and

top of head; fins plain light brown, with followingexceptions: the anal

shows

a

dark brown margin and

three

dark brown

stripes parallel with the free border; the ventral

membranes

are finely barred with blackish-brown;

and

the pectorals in life have a

row

of indistinct dark

brown rounded

spots across the base of the rays.

Type.

— A

^{sj^ecimen13.5cm. longover all,10.5}cm.tobase of caudal, taken in the estuary of the

Chantabun

River at

Lem Sing

(Lion Point), Southeastern Siam, July 17, 1928. Cat. No. 90322,

U.S.N.M.

Remarks. —

^{This species is}

known from

a single example. It

may

be readily distinguished

by

itspeculiar

physiognomy, which

strongly suggests a Periofhthalnius^ with its

prominent

eyes situated far for-

ward on

the

upper

profile of the large head.

APOCRTPTODON MALCOLMI. new species

Description.

— Body

very elongate, cylindrical anteriorly,

com-

pressed posteriorly,thedepth contained 6.4times in standardlength

;

head broad

and somewhat

flattened above, the breadth slightly

more

than depth, the length contained rather

more

than 4 times in length of

body

; snout broadly rounded,its length 4 times in

head

; eyes on top of head but directed

more

laterally than dorsally, 1.5 times in snout 6 times in

head

; interorbital space about 0.5 eye;

mouth

large, nearly horizontal, lower

jaw

included, maxillary almost 0.5 length of head

and

reaching 1 eye-diameter behind vertical

from

posterior borderofeye; widthof

mouth

equaltolength of

gape

;teethin

upper jaw

widely spaced,club-shaped, inclined outward,the 3

median

teeth on each side enlarged, curved,

and

fang-like; teeth in lower

jaw

horizontal, bifid,

and

14 or 15

on

each side, increasing gradually in size

from

symphysis outward, the outermost

under middle

of eye;

post-symphysealcaninessmall; caudal peduncleshort, itsleastdepth greater than its length

and

2.8 times in

head

; scales in longitudinal series 60, in transverse series (between second dorsal

and

anal) 13, predorsal scales 26,

body

scales larger posteriorly,

nape and

side of head as far

forward

as eyes completely covered with small scales, the squamation being defined

by an

oblique line extending

from

i)osterior

margin

of eye to antero-inferior point of opercle.

Fins:Dorsalrays VI-1,22, the

two

finsclosetogether

and

connected by a low

membrane

^; dorsal spines with elongate tips, their length increasing gradually to fourth

whose

length exceeds depth of

body

48 PROCEEDINGS

OF

THE NATIONAL MUSEUM

^vol.79

and

equals length of head without snout, fifth

and

sixth spines shortest; second dorsal rather low, the rays of nearly equal length, 0.5 head,last ray shortest, itsbase separated

from

caudal

by

a space less than O.o depthof peduncle: the pointedcaudal

somewhat

longer than head: anal 1,21, similar to second dorsal, its origin posterior to second soft ray of dorsal: ventrals

somewhat

longer than the bluntly-pointed pectorals

and

extending half

way

to anal papilla.

Color: Light

brown

above, bluish-white

on abdomen and under

side of head; head

and body

with

numerous

small

round

black spots of irregulardistribution, a

few

spots extending

on

base of soft dorsal fin: a series of 6 diffuse round dark

brown

blotchesextending along middle of side

from

head to caudal,

and

5 vertically elongate similar blotches extending

downward from median

line of back, alternating with the round blotches, several obscure blotches on top

Figure ^22.

—

Apocryptodon itALCOLMi

of head: first dorsal

unmarked:

caudal dusky% with faint cross- lines of

brown

spots;

and

with

dusky

edge; pectorals with blackish lower half.

Type.

—

This ^species is as yet

known from

a single specimen, 7.5

cm. long, taken

June

14, 1928, at the

mouth

of the

Chantabun

River, Southeastern Siam. It is a female with well-developed ovaries.

Cat. Xo. 90323.

U.S.X.M.

Remarks.

— ^Of

^{the half dozen species of}

Apocryptodon known from

India,

Malay

Archipelago,

and

Philippines, this species ap- pears to be mostly closely related to A. hleeken (Day).

That

form, however, according to Day's description

and

figure, has a different shaped head, longer maxillary (extending to preopercle), cheeks densely scaled as far forward as anterior

margin

of eye,

and

differ- ent coloration.

Xamed

for Dr.

Malcolm

A. Smith. F. Z. S., for

many

years resident in Siam, in appreciation of his interest in,

and

important contributions to the

knowledge

of, the zoologv of Siam.

U.S.GOVERNHENTPRINTING OFFICE:1911