June, '16] PARKER: DISPERSION OF MUSCA DOMESTICA LINNAEUS 



331 



1}^ west. Between it and the Sales Yards lies the old channel of the 

 Tongue river and a considerable wooded area between the old and the 

 present channels. 



During favorable conditions flies breed out at these Sales Yards in 

 immense numbers. The flies released here were captured for release 

 at the point designated at Station 168. PI. 26, fig 11 shows one of the 

 traps in which they were captured. Flies for release at the City 

 Dump and Washington School were also captured here in four Hodge 

 traps. 



City Dump (release point number 3). — 'This is located on the bank 

 of the Tongue river at the tip of a bend in its course. It is several 

 hundred yards west of the west central edge of the city, though there 

 is a group of houses between First and Second streets. Otherwise the 

 nearest section of the city is a negro settlement. Between the Dump 

 and Second street are woods of a rather open character (PI. 25, fig. 6). 

 ]\Iost of the material brought to the Dump was burned, but flies 

 were nevertheless very abundant. In order to reach the city from this 

 point flies would have to traverse the woodland or take a roundabout 

 course up the old Tongue river channel, though even in the latter case 

 it would be necessary to pass through, around, or over woodland of 

 less extent. 



Washington School (release point number 4). — This school 

 building and the grounds occupy the city block between Ninth and 

 Tenth streets and Orr and Palmer. It is in the best residential section 

 and quite centrally located, both with relation to the city and the 

 other release points. 



Taple I Estimated Numper of Living, Marked Flies in each Lot Released from each Release Point and 



Season's Totals 



Total flies released . 



387,877 



