1012 MR. C. TATE REGAN ON 



Southern United States. 



Five females, 40 to 68 mm., and two males, 65 and 78 mm., 

 from Pensacola and New Orleans. 



3. MOLLIENISIA FORMOSA. 



Limia formosa Girard, Proc. Acad. Philad. 1859, p. 115. 



Mollienisia formosa, Giinth. Cat. Fish. vi. p. 349 (1866). 

 $ . Depth of body 2| to 3 in the length, length of head 31 to 4, 

 Diameter of eye 3 to 3| in length of head, interorbital width 1| 

 to 2. 26 to 28 scales in a longitvidinal series. Dorsal 11-14; 

 origin a little nearer to base of caudal than to end of snout ; base, 

 in adult, nearly equal to its distance from caudal, but less than its 

 distance from head; longest rays g- to f length of head. Anal 

 9-10 ; origin below fourth i-ay of dorsal. Pectoral a little shorter 

 than head ; pelvics reaching vent or origin of anal. Caudal 

 rounded. Least depth of caudal peduncle | to | length of head. 

 A spot on each scale ; dorsal usually spotted. 



(S . Dorsal origin nearer to end of snout than to base of caudal ; 

 base as long as its distance from eye ; longest rays nearly | length 

 of head. 



Atlantic slope of Mexico and Central America. 



Several small specimens ( J and 5 ) up to 45 mm. from Tampico 

 {Jordan). Also three large females, 65 to 80 mm. in total length, 

 from Colon [Rachow) ; these are structurally similar to the others, 

 but have the coloration obscured by blackish mottling. 



4. MoLLiENisiA GRACILIS, nom. nov. 



Poscilia petenensis (non Mollienisia petenensis Giinth.) Giinth. 

 Cat. Fish. vi. p. 342, and Trans. Zool. Soc. vi. 1868, p. 484, pi. Ixxxv. 

 figs. 3, 4. 



2 . Depth of body 4 to 4i in the length, length of head 4| 

 to 4-|. Diameter of eye 3^ to 3| in length of head, interorbital 

 width 2. 28 to 30 scales in a longitudinal series. Dorsal 10-11 ; 

 origin equidistant from prteorbital and base of cauda.l ; anterior 

 branched rays | length of head. Anal 8-10, acutely pointed ; 

 origin below fourth ray of dorsal. Pectoral as long as head. 

 Least depth of caudal peduncle | length of head. Olivaceous; 

 scales dark-edged ; dorsal and caudal speckled. 



<S ■ Depth 3^ to 3f in length ; depth of caudal peduncle equal 

 to length of head. Dorsal oi-igin equidistant from end of snout 

 and base of caudal ; posterior rays longest, as long as or longer 

 than head. 



Lake Peten in Guatemala. 



Two females, 120 and 150 mm. and three males, 95 to 120 mm. 

 in total length, types of the species. 



5. Mollienisia SPHENOPS. (Text-fig. 173 F.) 



Pmcilia sphenops Cuv. & Val. Hist. Nat. Poiss. xviii. p. 130, 

 pi. 526 (1846) ; Eegan, Biol. Centr.-Amer., Pisces, p. 102, pi. xiii. 

 (1907) (with synonymy). 



