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Methods of Obtaining Insects Which Visited the Station

net, mosquitoes and practically

METHODS OF OBTAINING INSECTS WHICH VISITED THE STATION.

On June 26 an insect net 5 feet in diameter and 6 feet deep was so suspended from the balcony railing beneath the lantern that any wind from the northeast, east, or southeast would spread it; but the hope that insects might be caught in this net was not realized during the entire period of observations. The lamp at this station is apparently not of sufficient strength and its flashes not of sufficient length to attract many of the insects which may be passing. During a revolution of the lamp and lenses lasting 30 seconds two groups of three similar flashes occur, each group requiring 9 seconds and being followed by a blank interval of 6 seconds.

Practically all mosquitoes and flies were taken with a hand net. In order to catch all of the former a close examination of the entire station was made several times a day in order to dislodge any which had found resting-places in dark corners. However, most of the mosquitoes were taken in the act of biting some person. During a flight it was necessary only to station one's self quietly in the windward door of a room in order to entice any mosquito present within reach of the net.

After it had been observed that these insects occasionally were at tracted to the corks of bottles of raspberry shrub, dishes containing some of the liquid were set in several likely positions. Examination now and then resulted in the capture of a mosquito. After dark a flash-light was of great service in locating mosquitoes which were attempting to bite.

In order to capture house-flies it was necessary only to keep a close watch in the kitchen and living rooms and to net those which approached men at work outside. It was found possible to keep the station practically free of Muesa clomestica in this way. During periods of continued easterly winds the larger number of those taken on a given day were captured easily just after daybreak. These had doubtless arrived during the night. Single specimens would then be noted at long intervals during the day. Thus when dusk fell the station would again be practically free from flies.

It should be stated in this connection that there were absolutely no breeding-places for Musca domestica upon the station. The sewage and garbage were at once committed to the sea.