GILBERT AND STARKS — FISHES OF PANAMA BAY 



45 



Pixini ^n/. coiiiprcssa it differs in the relative length of the head and maxillary. In A. munde- 

 ola the maxillary is contained in the head i^ times (i.igto 1.37); in comprcssa li times (1.30 to 

 1. 81). In mundcola the head is contained 4.15 times in the length; in comprcssa 4.44 times. 



Since the jJiiblication of the above description, as cited, the material has 

 been further studied by Cliloe Lesley Starks, whose results we are permitted to 

 incorporate below. 



Twenty-seven specimens were measured, ranging in size from 72 to 120 mm. in length. In 

 A. paiiainensis ih.& head measures .21 to .25 of the length exclusive of the caudal; in A. mundeola .24 

 to .26. The depth of panamensis is .24 to .26; of mundeola .24 to .27. The size of the eye is the 

 most striking difference between the two species, holding well from .05I to .o6f in panamensis and 

 from .07 to .07^ \x\ mundeola. The ma.xillary measures about the same throughout (doubtless 

 some tips are broken). \x\ panamensis the snout measures about .04 and in micndeola from .04 to 

 .05. Gill-rakers and also the rays in the dorsal and anal fins number about the same in the two species. 

 The length of anal base in panamensis seems generally longer, running from .35 to .39 of length, 

 while in mundeola it runs from .33 to .36. The number of scales varies from 39 to 41 m panamensis; 

 from 36 to 39 in mundcola. 



The extremes of the two species differ greatly in appearance, and no difficulty 

 is encountered in sei)arating them; but a few specimens seem to come so nearly inter- 

 mediate that it is difficult to know to which form to assign them. When collected 

 the two species were easily separable on account of the faint, silvery, lateral stripe of 

 mundeola, but since preservation it has so faded in both species that it cannot be 

 considered. 



These two species may prove to be the same, but since A. mundeola has been 

 described, it will be better to consider the two as distinct, until enough material can 

 be obtained to settle the point beyond question. 



Measurements in Hundredths of Length to Base of Caudal. 



AnCHOVIA PANAMENSIS. 



(7) 



October 12, 1903. 



