Occasional Papers of the Museum of Zoology 35 



20. Hctcragrion flavidorsiiin Calvert 

 Figures 41, 108, 155 



Described (Calvert 4) from a single male from Coroico, 

 Bolivia, Alay 19, 1899, collected by W. J. Gerhard, coll. Acad. 

 Nat. Sci. Phila. In the pattern of abdominal coloration it is 

 apparently different from all other species in the genus. 



21. Hetcragrion ma jus Selys 

 Figures 42, 43, 62, 67, 91, 92, 106, 129, 130, 156, 157 



This fine large species was described from males from 

 Chiriqui, Panama. It has also been recorded from Peru (Ris 

 8). The male studied by Calvert (3) is in the Hagen collec- 

 tion. I have also seen two males and one female from Cachi, 

 Costa Rica, collected in February, March and July, 1910, by 

 Schaus and Barnes, in the Calvert collection, and so identified 

 by Calvert. The profiles are like those of albifrous. The 

 arculus is .4 to .5 mm. distal to the cubito-anal cross-vein, and 

 the anal vein separates from the posterior border from .3 to .5 

 mm. distad to the cubito-anal cross-vein. 



22. Heteragrion aequatoriale Selys 

 Figures 44, 45, 93, 113, 131, 132, 160, 161 



This species was described (Selys 2) from males from 

 Bogota, Colombia, and from the Rio Bobonaza, Ecuador. In 

 describing the teneral male the abdomen is stated to be 32 mm., 

 this doubtless should be 42 mm. The species has also been 

 recorded from Peru by Calvert (4) and Ris (8). The speci- 

 mens studied by Calvert are a male and female in the U. S. 

 Museum. Both are in poor condition and the female is so 

 teneral as to be unidentifiable, except by size and association 

 with the male. Menger's drawings (figures 131 and 132) in- 



