SICTDIUM.— CHONOPHOEUS. 11 



Hah. Mexico, Michoacan {Mus. Mexico), Hacienda del Hobo, Southern Mexico 

 (Geddes), Misantla *, Vera Cruz i (Mus. Brit.). 



I have examined several examples, measuring up to 120 mm. in total length. 



3. Sicydium multipunctatiim, nom. nov. (Tab. I. fig. i.) 



Cotyhfus 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 ; 8-5 scales in a longitudinal series. Dorsal VI, I 10. Anal I 11. 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. 



Hah. Mexico, Tequixistlan in Oaxaca {Gadotv ^). 



This species is known only from the type, a specimen 132 mm. in total length. 



5. CHONOPHOEUS, Poey, 1861. 



Awaous, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1898, p. 2234. 



Bodj' 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 raj's; anal with I 0-13 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 diff'er from 

 the females in having the snout more produced and the mouth larger. 



1. Chonophorus banana. 



? Gobius taiasica, LicLtenstein, Berl. Abhandl. 1822, p. 273 \ 



Gobius banana, Cuv. & Val. Hist. Nat. Poiss. xii. p. 103 (1837) " ; Giiuth. Cat. Fish. iii. p. 59 



(1861)'; Steind. Sitzungsb. Ak. Wien, Ivi. 1867, p. 351*; Cope, Trans. Am. Phil Soc. 



xiv. 1871, p. 473 ' ; Jord. & Gilb. Proc. U.S. Nat. Mus. 1882, pp. 368 & 379". 

 Gobius martinicus, Cuv. & Val. t. c. p. 105 ' ; Castelu. Anim. Am. Sud, Poiss. p. 26 (1855) '. 

 Gobius mexicanus , Giinth. t. c. p. 61 °. 

 Chonophorus bucculenhis, Poey, Mem. ii. p. 275 (1801) '°. 

 Rhinogobius contractus, Poey, t. c. p. 424 ", and Enum. p. 125 (1875) ''. 

 Rliinogobius bucculentus, Poey, Syn. p. 394 (1868) ", and Eiuun. p. 125 ". 

 Gobius dolichocephalus, Cope, Trans. Am. Phil. Soc. 1869, p. 403 ''. 



* This locality was erroneously given as Mazatlan in the original description. 



t The differences in the form of the upper teeth appear to be too much subject to intergradatiou to serve 

 for generic distinctions. If Coiyhpus be not recognized, the name punctatus must be changed, being 

 preoccupied in Sicydium by S. punctatum, Perugia, ISOG. 



C2 



