44 University of Michigan 



such streams are wide and exposed, and odonate life is rare 

 on them. Two of these streams are the Rio Lobaterita, on 

 the west side of town, in a deep valley, and the Rio Uraca, 

 which the railroad crosses about a mile below town. Tribu- 

 tary to these streams are small quebradas of various charac- 

 ters. Some are miry, sluggish streams with only a small flow 

 of water. Other quebradas are rocky, with waterfalls six to * 

 ten feet high. More rarely there are tributaries of an inter- 

 mediate character, where the fall is about three to fifteen feet 

 in the hundred, with frequent little waterfalls. In such a que- 

 brada the stream bed is usually small, rounded boulders, with 

 some gravel. Collected April 4-1 1, 1920. 



Along the Rio Lobaterita were frequent diversions from 

 the main stream, forming little streams which soon again 

 joined the larger volume of water. At these places and about 

 the mouths of small tributary quebradas Hctacrina macropus 

 flew in limited numbers. On a very rocky tributary, three to 

 eight feet wide, with only a small flow of water, but many 

 pools and waterfalls, macro pus was associated with capi talis, 

 both rather rare, and macropus about twice as abundant as 

 capitalis. Miniata was not seen on this stream. On a some- 

 what similar but flatter cjuebrada with more vegetation, which 

 flowed through town, and which we collected from the road 

 bridge far toward its source, capitalis, macropus and miniata 

 were present and numerous and occurred in about equal num- 

 bers. On quebradas which the railroad crossed just below 

 town macropus and miniata were common in about equal num- 

 bers. Along a small, short, muddy quebrada through brush 

 and heliconias in the river bottom of the Rio Lobaterita, the 

 three species, capitalis, macropus, and miniata, occurred, but 

 the first two were rare, in about equal numbers, while miniata 

 was about four times as numerous as the first two together. 



