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PROCEEDINGS OF THE NATIONAL MUSEUM 



{A. higuttata). Archamia fucata and A. lineolata are remarkably 

 similar in body form, scutellation, pigmentation, and fin-ray counts, 

 with the exception of the anal fin. A small difference was found also 

 in the gill-raker counts. A summary of the distribution of the num- 

 ber of soft anal fin rays and gill rakei-s for the species of Archamia 

 are given in tables 2 and 3. About 6 percent of the anal fin rays be- 

 tween fucata and lineolata show an overlap, fucata averaging about 

 21/^ rays more. A. lineolata averaged about one more developed raker 

 on the upper arch and about one-half raker more on the lower arch. 

 When the number of gill rakers and soft anal fin rays was considered 

 for each of these species, all specimens studied were separated. 



• All collections from the Philippine Islands unless indicated otherwise. 



' The rudiment count precedes the devcloped-raker count and is separated from it by a comma. 

 ' A single tiny rudiment was sometimes present and was included in the count. The raker at the angle 

 was included in the total count only. 



* From Formosa and Philippine Islands. 



A character index formed by subtracting for each individual speci- 

 men the number of soft anal fin rays from the total number of gill 

 rakers distinctly separates fucata from lineolata, as indicated in the 

 following frequency distribution : 



Color differences were observable when a series of specimens of 

 each species were simultaneously compared. In Archamia lineolata 

 (pi. 17, a) the black caudal spot is smaller and more intensely developed 



