1934] Entomological Investigations in Panama 171 
were taken in late afternoon and on cloudy days. Finding 
this species at Camp Pital indicates that it has a rather un- 
usual altitudinal range since it previously has been reported 
only from higher elevations, having been taken up to 9,000 
feet, and was considered as an Aedes of high altitudes only. 
Mansonia titillans (Walker) . Two females of this species 
were taken within our camp and a third was captured out- 
side while biting man. It was remarkable that this mosquito 
was not more in evidence since masses of the floating water 
plant, Pistia stratiotes , to the roots of which the larvae of 
this species remain attached, were present in the Madre 
Viejo River about two miles from Pital. 
Hsemagogus lucifer Howard, Dyar and Knab. Many 
adults reared from larvae collected from water in a hollow 
in a log. Culex inflictus larvae were also present in this 
water. 
The entomological fauna of Camp Pital was found to be 
rich in blood sucking flies of the family Tabanidae. The 
door of the camp had evidently been open for some time 
previous to our arrival and many flies of various families 
had entered and were grouped about on the inside of the 
screens when we moved in. A number of these were cap- 
tured and thirty-eight proved to be Tabanidae, with four 
genera and seven species represented. 
A mule used for transporting supplies was kept at the 
camp and during the greater part of the day it was tied at 
the edge of the forest to graze. This animal proved to be 
good bait for attracting Tabanidae and numerous specimens 
were collected from it. It also gave me an opportunity for 
making a few observations concerning the biting habits of 
some of the species. 
Pangonia prasiniv entris Macquart. Flies of this species 
were quite numerous and caused much annoyance to the 
pack animals at Camp La Vaca in February, 1930. Dr. 
Clark collected ten specimens at this time. 
Stibosoma flavistigma Hine. Only one specimen of this 
large fly was captured on the mule at Camp Pital. It was 
noted approaching with a swift circling flight and a loud 
