1934] Entomological Investigations in Panama 169 
killed titi monkey, but since it was not attached and con- 
tained no blood it was not credited with being a parasite of 
the animal. 
The howling monkeys, Alonatta palliata inconsonans, at 
Puerto Armuelles were found to suffer from Myiasis due to 
dipterous larvae but no howlers were taken during our stay 
at the camp and no myiasis was noted in any of the monkeys 
examined there. 
No lice-infested monkeys were found. The freedom of 
these monkeys from ectoparasites causes me to wonder if 
the species examined at the camp are habitually free from 
infestation of parasitic arthropods in this region or if it 
may have been due to the climate conditions prevailing at 
the time. 
A very large number of blood-sucking and parasitic dip- 
tera were collected, various genera in several families being 
represented. 
It was somewhat surprising to find that comparatively 
few adult mosquitoes were in evidence at the camp. There 
were a number of streams and pools exposed to sunlight in 
the cleared area, while in the surrounding forest there were 
numerous streams, pools and small swamps in dense shade. 
Thus the conditions in the immediate vicinity of the camp 
were suitable for mosquito larvae that preferred either sun- 
light or shaded environments. There were also many na- 
tural depressions present in the large tree trunks lying 
about the clearing which contained varying amounts of 
water adapted to certain species. The so-called tin can in- 
vasion had preceded us at this camp and a considerable num- 
ber of tin cans that had previously contained fruits or vege- 
tables had been thrown in a pile near the camp by former 
occupants. In some of these cans a small amount of the 
contents had been left and as the cans filled with water from 
rains this vegetable matter, and also leaves that had fallen 
into the cans from nearby trees, became decomposed and 
caused the water to become very foul. Mosquito larvae 
were found in a number of these cans. Enamelware soup 
bowls were used for breeding out the larvse investigated. It 
is to be regretted that the opportunity did hot permit a more 
