Occasional Papers of the Museum of Zoology 5 



the male abdominal appendages. I sent my two Colombia 

 specimens to Dr. Calvert for examination. He not only com- 

 pared them with the original male and female of tristani, but 

 kindly sent me, for my own collection, a second male of 

 tristani which he had received from Professor Tristan. This 

 specimen was taken at Nicoya, Gtianacaste, Costa Rica, in 

 February, 1912. Dr. Calvert's conclusion was that the Colom- 

 bian and Costa Rican males were specifically distinct by their 

 appendages, but he was unable to find any differences, other 

 than the slight one of size, in the females. He compared the 

 condition here found in Erpetogomphus to an analogous condi- 

 tion in the genus Hetaerina where the males of certain species 

 are easily recognized while their respective females can not 

 be distinguished. 



Habitat: Colombia. 



Type Specimens: One male, Cristalina, 28 kilometers on 

 the railroad above Puerto Berrio, Department of Antioquia, 

 February 19, 1917; i female, Maraquita, Department of Tol- 

 ima, February 3, 1917; collected by J. H. and E. B. William- 

 son; in the collection of E. B. WiUiamson; the male the type 

 of the species. The specific name refers to the beautiful little 

 stream, the Quebrada Sabaleticus, where the male was taken. 



Habits: I have elsewhere {loc. eit.) described the various 

 localities in which we collected in Colombia. The female, here 

 identified as sabaleticus, was taken along the upper San Juan 

 near ]\Iaraquita. As I came out from a small gully into the 

 stream bed it flew down from above the stream and alighted on 

 a flat horizontal leaf a foot or two above the ground. It was 

 the only Erpetogomphus seen about Maraquita. The male was 

 taken along the Quebrada Sabaleticus and, like the female, in 

 forest. I was stalking a large, handsome Gomphoides resting 

 on the tip of a stick at one end of a small pool. It flew up 



