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DISPERSAL OF MUSCA DOMESTICA LINNE. 
JAMES ZETEK, Ancon, C. Z. 
The latter part of May, 1913, unusual numbers of flies 
appeared at the Isthmian Canal Commission hotels and com- 
missary at Balboa, Canal Zone. An inspection revealed a 
pile of cow manure, etc., about 800 square feet in area, located 
at one corner of Ancon Cemetery, 2,500 feet distant 1n direct 
line from the hotel. This place is indicated by the letter ““B” 
on the accompanying map. This manure was heavily infested 
with maggots, principally of Musca domestica, Hermetia allucens, 
Volucella obesa, and Paralucilia macellaria. Puparia were very 
abundant and adults in countless numbers. This was the only 
manure pile found away from the incinerators. 
EAST BALBOA 
CANAL ZONE, PANAMA 
SCALE 
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Fic. 1. Map of the region. 
A pit was dug, into which was placed a small quantity of the 
infested manure. A cover of earth one foot deep was added as 
a protection from heat rays. Over this was placed a screened 
cage. On June 6th the cage contained about five thousand 
adult flies, most of them the common typhoid-fly. At 9:00 
a. m. these were sprayed with an aquaeous solution of gentian- 
7° 
