Occasional Papers of the Museum of Zoology 13 



1. Hefaerina americana Fabricius. 



Guatemala, Agua Caliente (5, 9), Amatitlan (5), Gualan (9, 15). 



In Guatemala, as well as in North America, this species 

 frequents larger streams, usually fifteen feet or more in width. 

 In the jMotagua River basin it does not seem to descend lower 

 than Gualan, which point marks the highest extension up the 

 valley of //. tkia. 



2, Hetaerina caja Drury. 



Panama, Rio Mazamba (10), Rio Sardanilla (/, 9, 10) : Colombia, 

 Aracataca, Bolivar (3, 9), Cristalina (3, 9, 10), Don Jaca, El Banco, 

 Fundacion, Maraquita (3, 9, 10), Rio Frio (9), Santa Marta (9), 

 Sevilla; Venezuela, Bejunia (3, 9), Boqueron (9), Caserio Silva (9), 

 El Guayabo (10), La Fria (9, 10), Nirgua (3, 9), Palma Sola (9), 

 Salom (9), San Esteban (3, 9), San Felipe (9), Tucacas ; Trinidad, 

 Arima, Chaguanas, Cumuto, Cunapo River (9), Diego Martin River 

 (9), JNIaracas River (9), San Juan River (9), St. Joseph River (9). 



This species and H. macropus, in about equal numbers, 

 are each represented in our collections by many more speci- 

 mens than is any other species. It seems to prefer more 

 exposed streams than its associates, occurring on the sunniest 

 stretches of streams where their flow is slower and the bed 

 less rocky. In a hilly country such habitats are found at the 

 edge of the hills where the streams pass into level valleys. 



Two fairly well-defined series are represented in the mate- 

 rial ; a larger, with darker thoracic markings and more exten- 

 sive and darker basal wing markings in the male ; and a 

 smaller, with paler thorax and with reduced and paler basal 

 wing markings in the male. The former occurs in Panama 

 and Colombia and in the Catatumbo region (La Fria and El 

 Guayabo) in Venezuela ; the latter occurs in Venezuela east 

 of the Catatumbo region and in Trinidad. Our opinion that 

 only a single species is represented in the lot has been con- 

 firmed by Dr. Calvert and Dr. Ris. The red spot on the apex 



