NO. 5 MYERS AND WADE : ATHERINID FISHES 119 



Jordan believed he was proposing the new genus for his own 1881 Ather- 

 inella eriarcha. However, if we were to consider that Jordan's name 

 Eurystole belongs with Stanford 2689, which we are now describing as 

 a new species, the well-known combination Eurystole eriarcha would be 

 broken up, eriarcha would receive a new generic name, and Eurystole 

 would contain only species described 46 years after its first diagnosis. 

 This appeals to us as preposterous, in the present instance at least, and 

 we therefore follow the senior author's inclination — that a generic name 

 should constantly be associated with the specific name of its designated 

 type species, whatever concept the describer of the genus may have had of 

 that type species. This is also in line with the general recommendation of 

 the International Commission in Opinion 65 — that "if an author desig- 

 nates a species as genotype it is to be assumed that his determination of 

 the species is correct." 



Eurystole eriarcha (Jordan and Gilbert) 

 Plate 17 



Atherinella eriarcha Jordan and Gilbert, 1881, p. 348 ( Mazatlan ) . 

 f Eurystole eriarcha Osburn and Nichols, 1916, p. 156 (Cape San Lucas, 

 and Santa Catalina Island, Gulf of California). — Breder, 1936, 

 p. 6 (San Jose del Cabo, Lower California). — Seale, 1940, p. 14 

 (Port Utria, Colombia; but not Galapagos specimens). 



Material examined. — One hundred thirty-eight specimens, in the col- 

 lections of Stanford University (54), the U.S. National Museum (3), 

 and the California Academy of Sciences (81). 



Stanford 37054: 3 specimens, 54-64 mm, Muertos Bay, Baja Cali- 

 fornia, 23° 59' 15" N., 109° 49' 30" W., March 6, 1939, dip-net under 

 electric light from N. B. Scofield at anchor in 4 fms, R. L. Bolin, collec- 

 tor; — 37055 : 26 specimens,^ 47.2-64.5 mm, off Arroyo de San Luis, Baja 

 California, 23° 10' 30" N., 109° 27' 45" W., IVIarch 7, 1939, dip-net 

 under electric light from A^. B. Scofield at anchor in 5 fms, R. L. Bolin, 

 collector; — 37056: 21 specimens, 39-67 mm, Santa Cruz Bay, Oaxaca, 

 Mexico, 15° 45' N., 96° 07' 20" W., March 14, 1939, dip-net under 

 electric light from N. B. Scofield at anchor in 8 fms, R. L. Bolin, collec- 

 tor; — 37057: 3 specimens, 49.5-50 mm, Maria Magdalena Island, Tres 

 Marias Islands, Mexico, February 9, 1940, Vernon Brock, collector. 



1 Specimens from this lot are being deposited in the Hancock Foundation and 

 the U.S. National Museum. 



