190 PROC. ENT. SOC. WASH., VOL. 21, NO. 8, NOV., 1919 



mangrove trees are mainly low which may be explained by 

 the presence of brackish water or brackish soil at the roots. 



The black muck soil of the Everglades overlies marl or limestone 

 rock. 



Near West Lake are encountered endlessly meandering lagoons 

 of White Water Bay, with mud or rock bottoms and with the 

 only slightly brackish water waist deep. 



The endless waste of brown saw grass as high as a man's 

 head is even here broken by low, green hammocks of red man- 

 grove, bay berry, poison wood and cocoa plum. A tropical aspect 

 is afforded by the presence of the green but leafless wild vanilla 

 vines. 



Tracks of otter, deer and marsh rabbits were observed. 



C. A. Mosier captured an adult of Tabanus americanus at 

 Paradise Key in 1919, on February 28. This was the first appear- 

 ance of this fly for the season. On March 1 another adult was 

 observed; on March 2 there were a few adults on the veranda 

 screen; there was a slight increase in numbers on March 4 to 5. 



On March 2 the junior author collected an adult of T. lineola 

 in the Everglades directly west of Miami along the Tamiami 

 trail. 



On March 7, Tabanus lineola was increasing in numbers at 

 Paradise Key, but only a few adults of T. americanus were ob- 

 served daily. March 8 and 9 showed an increase in numbers of 

 T. americanus and lineola. 



The first pronounced flight of T. americanus at dawn at Par- 

 adise Key in 1919 occurred on March 10. On March 11 the 

 flight had increased about three hundred per cent. 



The junior author had made plans to shoot with dust shot 

 some of the lower hovering adults of T. americanus during 1919, 

 but had to leave Paradise Key before the flight began. It was 

 desired to determine whether the flight was composed entirely 

 of males and whether the flies occasionally hovered upside down. 

 However, on March 11, H. S. Barber shot three adults with a 

 22 caliber pistol, using dust shot. All these adults were hovering 

 and were males. The weather was foggy and cloudy and rain 

 was forecasted. Adults of Chrysops were common and T, lineola 

 was daily increasing in numbers. 



On March 12 the flight of Tabanus americanus at dawn was of 

 increased volume. Barber shot two males on the wing, hovering. 

 One adult of the nocturnal flying T. jlavus was on the veranda 

 screen during the day. 



March 13 was cold and there was no flight. On March 14 it 

 was dark and cloudy at the usual time for the flight; there had 

 been rain during the night. Nevertheless, there was a consider- 



