SURUBRES AND OROTINA 393 



There were relatively few bromeliads on the trees here 

 and we found no dragonfly larvae in any of those we were 

 able to examine, although the adults of Mecistogaster ornatus 

 were seen in these woods. The yet unfolded leaves of the 

 numerous Heliconias formed cornucopias often filled with 

 water, and perhaps may take the place of the bromeliads 

 of the Atlantic slope as breeding places for these forest 

 dragonflies; with this in mind we frequently searched among 

 these leaves for larvae. In pulling down one to examine it 

 P. found that a bat was disturbed from somewhere and flew 

 off. Later another bat disappeared from the same vicinity, 

 so suspecting that they had come from this leaf he pulled 

 it over more cautiously and looking in saw a third still within. 

 It was a small bat, with the body about one and a half 

 inches long, exclusive of the tail. Its most striking features 

 were the suckers on its limbs; each wing had a sucker on the 

 front edge where ordinary bats have a claw, and each hind 

 foot bore a smaller sucker. It was a species of Thyropteray 

 probably T. discifera. Subsequently I unrolled the remain- 

 der of this leaf finding in the bottom bat excrement and num- 

 bers of very small flies, Leptocera (or Limosina) bromeliarum, 

 of the family Borboridae. They were from one-fiftieth to 

 one-thirty-third of an inch in length, with a black, almost 

 shining body and clear, somewhat yellowish wings. As 

 the specific name indicates, this insect was first found in 

 bromeliads. It was discovered at Cordoba, Mexico, in 

 March, 1908, by Mr. F. Knab. As many of the Borboridae 

 are scavengers, these individuals may have fed on the bats' 

 excrement. In all twenty-three species of this genus of Bor- 

 boridae have been detected by Mr. Malloch among the small 

 flies which we collected in different parts of Costa Rica, 

 and sixteen of the twenty-three he has described as new. 



I looked through other unfolded Heliconia leaves, finding 

 within them more of the small flies and a few beetles, but no 



