LUCANIA. — EIVULUS. 81 



25 or 26 scales in a longitudinal series. Dorsal 11-13 ; origin equidistant from tip of enout and base of 

 caudal. Anal 9-11; origin below middle of dorsal. Pectoral | the length of head. Caudal rounded. 

 Olivaceous ; edges of scales darter ; a silvery lateral stripe ; fins plain (?) or a dark spot at anterior 

 edge of dorsal ( cT ). 



Hah. Coasts and rivers from Florida to Tamaulipas : 



Pensacola in Florida ^ ; Indianola in Texas i ; Mataraoros in Tamaulipas ^. 



Here described from specimens from Florida, measuring up to 60 mm. in total 

 length. 



3. EIVULUS, Poey, 1860. 



Rlvulus, Giinth. Cat. Fisli. vi. p. 327 (1866) ; .lord. & Everm. Bull. XLS. Nat. Mus. xlvii. 1896, 



p. 662. 

 Cynodonkhthys, "Meek, Pnbl. Columbian ]\'Ius , Zool. v. 1904, p. 101. 



Oviparous. Mouth rather small, with short lateral cleft ; rami of the lower jaw firmly united ; teeth pointed, 

 in bands, with an outer series of enlarged, curved, conical teeth. Margins of eyes not free. 



This genus comprises four species from Mexico and Central America, two from 



Cuba, and about eight from South America *. The head is rather broad and the 



body is somewhat elongate, subcylindrical anteriorly and compressed posteriorly. The 



snout is short, and the lower jaw projects a little beyond the upper; the lateral o'ape 



of the mouth is short, horizontal, and about on a level with the middle of the eye • a 



vertical cleft in front of the eye marks the posterior edge of the broad lower lip. The 



teeth of the outer series are rather few and strong, and do not extend on to the sides 



of the jaws ; one or two of the lateral teeth of this series may be longer than the others. 



The rather short dorsal fin is placed further back than the longer anal. The pectorals 



are obtuse and are placed very low ; the ventrals are small ; the caudal is rounded or 



subtruncate. 



Synopsis of the Mexican and Cenfral-American Siiecies. 



I. Origin of dorsal over posterior part of anal, which ends below the middle of the dorsal. 



Dorsal 9. Anal 12. 42 scales in a longitudinal series 1. fiahellicauda. 



Dorsal 8. Anal 11. 38 scales in a longitudinal series 2. tenuis. 



Dorsal 8. Anal 11. 35 scales in a longitudinal series 3. godnani. 



II. Origin of dorsal over middle of anal, which ends a little in advance of the 



end of the dorsal. Dorsal 9. Anal 11. 32 scales in a longitudinal series. 4. isthnensis. 



1. Eivulus flabellicauda. (Tab. x. fig. 6.) 



Bivulus flabellicatida, Regan, Ann. Mag. Nat. Hist. (7) xix. 1907, p. 64'. 



Depth of body 4| in the length, length of head 34-. Snout shorter than eye, the diameter of which is 4 in 

 the length of head; interorbital width 2^ in the length of headt. 42 scales in a longitudinal series. 



* BajjlocJiihis harti, Bouleng., from Trinidad, and H. peruamis, Eegan, from Peru, belong to this genus. 

 t In this species and in li. 02>ercularis the interorbital width is less than the interoculav width. 

 BIOL. CEKTE.-AMER., Pisces, Man 1907. M 



