1370 Bullcti?! //, United States National I\Inscnm. 



Length 3 to 8 inches. Pacific coast of Mexico; excessively common in 

 shallow bays, and entering streams; known from Guaymas and Cape San 

 Lucas to Panama ; once taken at San Diego. 



Biapterus califomiensis* Gill, Proc. Ac. Nat. Sci. rhil.a. 1862, 245, Cape San Lucas. 



(CoU. Xantu.s. ) 

 Biapterus gracilis, Gill, Proc. Ac. Nat. Sci. Pbila. 1862,246, Cape San Lucas. (Coll. 



Xantus.) 

 Gerres cinereus,\ var. nov., EiGENMANN & Eigenmann, Amer. Naturalist, Feb., 1891, 155, 



San Diego. (Coll. Eigenmann.) 

 Gerres gracilis, Evebmann &. Meek, I. c, 261. 

 Gerres califomiensis, Evermann & Meek, I. c, 263. 

 Hucinostomus calif orniensis, J Jokdan, Proc. Cal. Ac. Sci. 1895, 469. 



1747. EUCIN'OSTOMUS GULA (Cuvier & Valenciennes). 

 (Silver Jenny; Mojarra de Ley; Petite Gueule.) 



HeadSJ^; de*pth2|; eye 3 in head; snout 3|; interorbital width 3. D. 

 IX, 10; A. Ill, 8; scales 5-42-9. Body elliptical, compressed, back moder- 

 ately elevated, month small; end of maxillary reaching slightly past 

 vertical Irom front margin of orbit; exposed portion of maxillary nearly 

 oblong, its width al)Out 2 in its length, which is from 4 to 5 in the length 

 of the head; preorbital and preopercle entire. C4ill rakers small and weak, 

 7 below the angle; premaxillary groove scaled in front, the posterior part 

 naked, forming a sort of pit; longest dorsal spine li in head; second anal 

 spine shorter and .stronger than third, its length abont 3^ in head ; ventrals 

 reaching nearly to vent, their length 1| in length of head; pectorals 

 reaching front of anal, their length about 3 in length of body. Second 

 interhjemal hollow and enlarged. Color silvery, greenish, darker above; 

 no distinct longitudinal lines except in very young; upper margin of 

 spinous dorsal more or less black ; dorsal and anal fins dusky, other tins 



* The following is the substance of Dr. Gill's description of E. calif orniensis : 



HeadSJ; depth 2i in young. D. IX, 10; A. Ill, 8. Scales 6-44-13. Caudal peduncle 

 slender and attenuated at middle. The diameter of eye 2j times (.09) in bead ; snout 3^. 

 Interorbital area flattened, groove for the posterior processes of premaxillarios broad, 

 scaleless, semioval, and reaching vertical of ends of masillaries, exposed portions of niax- 

 illaries convex above, semicordate, twice as long as broad. Lateral line signioidally 

 curved. Second and third dorsal spines nearly equal, 5J in body, IJ in head, nearly twice 

 as long as last spine. Third anal spine larger than second, shortti tlinii last doi-sal one, 

 and 4 in head. Caudal 4 longer than head, equaling pectorals, :ni(l twiic as long as 

 ventrals. Color silvery, with steel-blue reflections above; the tins iinmaciilatc. (Gill.) 



t A specimen taken at SanDiegoand recorded by Dr. Eigenmann a.s ■ ' (icnis riucrcvs, var. 

 nov.," seematohelongtoUucinostomus calif oriiiensis. HeadSi; depth 2X; sialfs C-45-10; 

 eye equal to interorbital space, 5 in head ; maxillary just reaching front ot eye : jiredursal 

 distance 2i in length; caudal tin slightly longer than head, second anal spine slmrt, about 

 3J in headl ventral tins 1 i in head. Dark punctulations every where, except on ventral 

 .surface; no dark lateral Imrs; upper portion of spinous dorsal tin blackish; all the tins 

 finely punctate, the pcctdrals least so; a dark-blue axillary spot. Length about 7 inches. 

 San Diego. (Kigt'imiaim.) 



l"i:ucinostiiuu's calinirniensis is generally common along the west coast of Mexico, 

 from Guaymas to raiia'iun. It is probably, however, not found in the "West Indies, .he 

 closely related Euclnonfinnus harengulus being apparently a dirt'erent .species. The speci- 

 mens called cai(/o»-«(e«*f« by Gill, having the premaxillaiy groove semioval or U-shaped, 

 seem to represent the adult of tliis species. Those called nnu-ilix. ^vit h the premaxillary 

 groove linear, are the young or half grown. Still otlu is, csinMially adults, have the 

 jireraaxillary groove round, forming a pit, iind every intermediate ( liaraeter may be found. 

 At first we thought it ]iossible to separate califomiensis and gracilis as distinct species. 

 The careful reexamination of some 200 specimens leaves us wholly unable to separate 

 them, as all grades of variation occur. Apparently the premaxillary groove is linear in 

 the young, growing Ijroailer with age, but the changes very irregular. The name Eucino- 

 stomus californiensishas priority over E. gracilis". (Jordan.) 



