964 I. M. Hawiey 
In 1920 the first flies were found on May 7, and during periods of warm 
weather they continued to emerge in numbers until: the first of June. 
Most of the eggs of this brood were deposited between May 25 and June 5. 
Weather conditions in July of that year were more favorable than in 1919, 
and flies lived in the cages until the first of August. 
Dates of emergence vary greatly at different altitudes. Flies have been 
found in abundance, a week or more before the Perry emergence, at places 
ten miles from Perry where the elevation is much less.. The bean labora- 
tory was located on what is said to be one of the highest points between 
Lake Erie and the Genesee River, its elevation being 1400 feet. Data 
obtained at Perry, therefore, while holding true for much of the western 
New York bean-growing section, are probably later than for most parts of 
the State. The opening of spring at Perry is at least a week later than it 
is at Ithaca. 
The time of emergence of Hylemyia cilicrura is dependent largely on 
temperature. If there are several warm days early in May, some flies 
will appear. If such a warm period is followed by colder weather, addi- 
tional flies may not be found for a week or two, or until the temperature 
has again moderated. 
Length of life 
Adults of Hylemyza cilicrura have lived in cages for from 2 to 44 days. 
In 1920 nine flies under observation lived for an average of 26 days. 
Without food, life ‘s short, but in cool weather the flies will live for many. 
days in moist cages if they are supplied with sweetened water. The time 
in this period when eggs are deposited is not well known; but from the 
fact that adults with immature ovaries are normally found for many 
days before mature specimens appear, it is probably toward the end of the 
adult life. Many flies were taken by sweeping in the field on May 20, 
1920, at which time most of the females dissected contained immature 
eggs. Flies taken at this time were placed in cages, and deposited eggs. 
between June 1 and June 6. Apparently, then, the length of the pre- 
oviposition period is about two weeks. 
Habits . 
The author’s inability to obtain eggs from flies reared in captivity nt 
already been mentioned. Molasses, sugar water, and decaying material 
were placed in cages, but all failed to supply suitable conditions. A large 
cage, six feet square, in which beans, cabbage, and mustard were growing) 
and which contained decaying material also, failed to give any better results. 
Flies were attracted in large numbers by sugar water and molasses. In 
the field many flies were found in bait pans contain’‘ng a mixture of 
molasses, water, and sodium arsenite. 
In the spring the flies are attracted to’ moist, newly plowed ground, 
They crawl deep into the crevices of the soil, stopping occasionally to lap 
