SICYDIUM.—CHONOPHORUWS. 11 
Hab. Mexico, Michoacan (Mus. Meaico), Hacienda del Hobo, Southern Mexico 
(Geddes), Misantla *, Vera Cruz! (Mus. Lrit.). 
I have examined several examples, measuring up to 120 mm. in total length. 
8. Sicydium multipunctatum, nom. nov. (Tab. I. fig. 1.) 
Cotylopus punctatus +, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 362°. 
Horizontal teeth of lower jaw concealed. Scales not extending forward on to the head; abdomen with a 
median naked area; 85 scales in a longitudinal series. Dorsal VI,I10. AnalI11. Head covered 
with small dark spots; a similar spot on each scale of the body; numerous small dark spots on the 
dorsal fins and on the base of the pectoral. 
Hab. Mexico, Tequixistlan in Oaxaca (Gadow 1). 
This species is known only from the type, a specimen 132 mm. in total length. 
5. CHONOPHORUS, Poey, 1861. 
Awaous, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1898, p. 2284. 
Body elongate, little compressed; head naked, elongate; mouth moderate or large, horizontal; jaws equal 
anteriorly or the lower the shorter, with narrow bands of small pointed teeth and an outer series 
of more or less distinctly enlarged teeth; palate toothless. Eyes moderate, placed high; interorbital 
region rather narrow. Gill-opening nearly vertical, placed in front of the base of the pectoral, scarcely 
produced forward below; 2 or 3 fleshy flaps on the anterior edge of the pectoral arch, projecting into 
the branchial chamber and covered by the operculum. Scales small or moderate, ctenoid. Two dorsals, 
with VI, I 9-12 rays; anal with I 9-13 rays; caudal rounded; pectoral symmetrical, rounded; ventrals 
completely united to form a rounded disc, which is free from the body and has a well-developed basal 
membrane. 
This genus comprises about ten species from the Tropics, all of which enter or 
reside in rivers. ‘The species are variable and difficult to define; the males differ from 
the females in having the snout more produced and the mouth larger. 
1. Chonophorus banana. 
? Gobius taiasica, Lichtenstein, Berl. Abhandl. 1822, p. 273°. 
Gobius banana, Cuv. & Val. Hist. Nat. Poiss. xii. p. 103 (1837)? ; Giinth. Cat. Fish. iii. p. 59 
(1861) °; Steind. Sitzungsb. Ak. Wien, lvi. 1867, p. 351*; Cope, Trans. Am. Phil. Soc. 
xiv. 1871, p. 473° ; Jord. & Gilb. Proc. U.S. Nat. Mus. 1882, pp. 8368 & 379°. 
Gobius martinicus, Cuv. & Val. t. c. p. 105"; Casteln, Anim. Am. Sud, Poiss. p. 26 (1855) °. 
Gobius mexicanus, Giinth. t. c. p. 61°. 
Chonophorus bucculentus, Poey, Mem. ii. p. 275 (1861) *°. 
Rhinogobius contractus, Poey, t. c. p. 424", and Enum. p. 125 (1875) ™. 
Rhinogobius bucculentus, Poey, Syn. p. 394 (1868) *, and Enum. p. 125™. 
Gobius dolichocephalus, Cope, Trans. Am. Phil. Soc. 1869, p. 403”. 
* This locality was erroneously given as Mazatlan in the original description. 
f The differences in the form of the upper teeth appear to be too much subject to intergradation to serve 
for generic distinctions. If Cotylopus be not recognized, the name punctatus must be changed, being 
preoccupied in Sicydium by S. punctatum, Perugia, 1896. 
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