104 PROCEEDESTGS OF THE NATIONAL MUSEUM vol.99 



membrane folding between jaws; dentigerous surface of premaxillaries 

 not reflected outward and covering face of that bone with "shagreen"; 

 two dorsal fins present; silvery lateral band present; mouth small, the 

 maxillary not reaching to e3'^e; air bladder and body cavity not 

 reaching anywhere near to opposite anal fin origin; first dorsal origin 

 notably in front of anal origin; pelvic insertions much closer to oper- 

 cular margin or upper angle of pectoral fin base than to anal origin; 

 about 5 or 6 scales forming a sheath anteriorly along base of anal 

 fin; margin of scales entire; distal margins of dorsal and anal fins 

 concave; ascending process of premaxillary a narrow based spine- 

 like projection; vertebrae in one count 16 + 24. 



It differs from all other genera of Atherinidae by having the anus 

 far forward, equidistant between pelvic insertion and anal origin or 

 nearer pelvic base than anal origin in combination with the four 

 glandlilvc depressions on dorsal surface of snout and the body cavity 

 nowhere near reaching to opposite the anal fin origin. 



The only other related atherine fishes with the posterior end of the 

 premaxillary dilated that have the anus far forward is Archomenidia 

 sallei (Regan), but that genus has the air bladder and body cavity 

 conspicuously extending some distance past the anal fin origin. 



The only related genus of atherine fish with the four glandlike 

 depressions on the dorsal surface of the snout is Membras, but that 

 differs from Adenops in having the anus just in front of the anal -fin 

 origin. 



ADENOPS ANALIS Schultz 



Figure 14 



Adenops analis Schultz, Proc. U. S. Nat. Mus., vol. 98, p. 34, 1948 (type locality, 

 Lago de Maracaibo.) 



Holotype.' — U.S.N.M. No. 121824, a specim.en, 59 mm. in standard 

 length, collected by Leonard P. Schultz at night by flashlight in 

 Lago de Maracaibo, 1 km. off Pueblo Viejo, Venezuela, on April 7-8, 

 1942. 



Paratypes.—U.S.'NM. No. 121823, 66 specimens, 9 to 53.5 mm. 

 in standard length, taken along with the holotype and bearing same 

 data. There appear to be at least two age groups in this lot with 

 25 specimens 9 to 17.5 mm. and 41 fishes 19.5 to 53.5 mm. 



Description. — Detailed measurements were made on the holotype 

 and two paratypes, and these data, expressed in hundredths of the 

 standard length, are recorded in table 16. 



Greatest depth of body about 5.5 to 5.75, head 4.5 to 4%, both in 

 standard length; snout 3.5 to 3.75, orbit 3)3 to 3.5, interorbital 3 to 

 SYz, all in length of head; premaxillary a little curved, causing gape 

 of mouth to be somewhat concave; mouth rather smaU, the maxillary 

 not reaching to front of orbit; gill rakers slender, the longest about 



