NO. 5 MYERS AND wade: ATHERINID FISHES 141 



of spines in the first dorsal (VI to IX). A few Atherinopsinae have VI 

 spines, but this is the lower limit for Melanorhinus and is reported for the 

 genus only in Metzelaar's original description of M. boekei. Since the 

 last two or three spines are difficult to see, it is possible that Metzelaar 

 missed some. 



Melanorhinus cyanellus (Meek and Hildebrand) 



Mugilops cyanellus Meek and Hildebrand, 1923, p. 271, pi. 22, fig. 2 



(Balboa and Taboga Island, Panama). 

 Mugilops cyanella Breder, 1936, p. 10 (Perlas Islands, Panama). 



Of this species, known only from the types and a single example re- 

 corded by Breder, we have examined one specimen (Stanford 35450) 

 taken at the surface off Puntarenas, Costa Rica, February, 1937, by 

 Captain Takahashi of the tuna boat Marico. It was presented to the 

 Stanford Natural History Museum through the courtesy of the Califor- 

 nia State Fisheries Laboratory. There are also several specimens in the 

 Allan Hancock Foundation, identified by the junior author, but these 

 have not been re-examined at this time. 



5. SUMMARY 



This paper deals with the published records and available specimens 

 of the Pacific American Atherinid genus Eurystole. It is shown that the 

 one supposed species, E. eriarcha, is actually a complex of two related but 

 ver>' distinct genera and four species, all of which have at one time or 

 another been identified as Eurystole eriarcha. Eurystole consists of one 

 species, eriarcha, ranging from Lower California and the Revillagigedo 

 Islands to Colombia. The other three species, all of them new, are placed 

 in the new genus Nectarges (type N. nepenthe), which is divided into 

 two subgenera. The subgenus Nectarges includes N. nepenthe from Mex- 

 ico and N. nocturnus from Ecuador and Peru. The new subgenus Eury- 

 arges includes only Nectarges nesiotes from the Galapagos Archipelago. 

 All are small inshore surface swimmers. 



The new genus Coleotropis is described for Menidia starksi Meek 

 and Hildebrand from the Pacific coast of Panama, related to the genus 

 usually called Thyrina. It is shown that the preoccupied name Thyrina 

 must be replaced by Melaniris Meek. 



The relationships of the tropical American genus Alelanorhinus 

 Metzelaar among the Atherinidae in general is discussed for the first time 



