1914] Dispersal of Musca Domestica Linne. 71 
violet, to which a small amount of gum tragacanth had been 
added. (See Annals Ento. Soc. Am. Vol. VI, No. 1, pp. 5-21). 
These marked flies were liberated at 9:30 a. m. at the same place. 
At the hotels, commissary and a few private houses, tangle- 
foot paper was used freely, and this was afterwards collected 
by the writer and examined for the presence of any marked 
flies. The method used was to wet each fly with a solution of 
alcohol and glycerine. The marked fly became known by the 
resolution of the tiny crusts of anilin dye adhering to its body. 
Seventeen marked flies were thus recovered, viz: 
East Balboa Hotel, 4 &@ Musca domestica from paper ex- 
posed for 32 hours after the sprayed flies had been liberated 
at the cemetery. 
Profile , “B line from 
breeding place to hotel. 
Impro bable path 
> 2500 ft.< 

Fic. 2. Profile in direct line. 
Spanish Mess, 9 (7 o&, 2 2) typhoid flies from paper exposed 
32 hours. 
Commissary, 3 o& typhoid flies, from paper exposed 32 
hours. 
Spanish Mess, 1 & typhoid fly, from paper exposed 75 hours 
(in reality 43 hours aftér last batch of paper was collected.) 
No attempt was made to catch flies outside of these screened 
buildings, hence the 17 recovered adults represent only such as 
had gained entrance through holes in the screening or while 
the doors were opened and closed. The species found on the 
fly paper were mainly Musca domestica and Hermetia illucens, 
both of which breed freely in pit closets as well as in manure, 
and which were very plentiful upon cooked and uncooked food. 
