284 Philippine Journal of Science 1919 
seen in the warmer parts of the earth are largely composed of 
males. 
No mention seems to have been made, in accounts dealing 
with mosquito swarming, of Anophelines performing this in- 
teresting act. Two years ago this month (in March, 1917) 
having had occasion to descend Faculty Hill at the college cam- 
pus, at dusk, I encountered two or three distinct swarms of 
Myzomyia rossii Giles dancing in the air, at a height of about 
2.5 meters above the roadway. Rapidly sweeping my hand 
through the swarm I caught a few specimens for the purpose of 
identification, as I did not observe at the time that they were 
Anophelines, not Culicines. A note of the occurrence was made, 
but no further observations were had and the matter was for- 
gotten until March 4 of this year (1919) when, upon returning 
home from my laboratory at 8.25 in the evening I encountered 
four distinct swarms within 60 meters of my house, which stands 
on a rise of ground at the foot of Faculty Hill. These swarms 
were hovering at about 1.5 meters above the roadway; their 
music was quite audible, and they were flying against a wind 
having a velocity of 12 to 15 kilometers an hour, maintaining 
themselves without the slightest difficulty at any point desired 
(as, for instance, directly overhead) and following me as I 
passed through the swarm. 
When my hand swept among them, in order to capture a few, 
the whole mass darted off to right or left, or up or down the road, 
with the greatest ease and with a decidedly concerted motion, 
returning when the disturbance ceased. Hastening to the house, 
I secured a net and returned to find that they were even closer 
to the ground than before, the base of the swarm being less 
than a meter from the roadway; but, as the entire swarm was 
dancing up and down, the individuals frequently rose to a 
height of 3 to 4 meters in the air. 
With a couple of sweeps of the net, I caught one hundred 
twenty-seven individuals out of two of the swarms and I es- 
timated that each swarm must have contained in the neighbor- 
hood of a thousand individuals. 
On the evening of March 5 the same phenomenon was wit- 
nessed about 1 G 0 meters farther up the same road, at precisely 
the same hour. The road at this point was well shaded on both 
sides by several high trees. The swarms in this case were very 
much larger than those seen the previous evening. They ex- 
tended higher into the air and seemed to dance with much more 
