PROC. ENT. SOC. WASH., VOL. 20, NO. 0, JUNE, 1918 123 



On May 2 there was a light rain at dawn and it was very cool; 

 the flight was strong, during a light drizzling rain and lasted 

 twelve minutes. 



I observed many males on the trees throughout the jungle, a 

 very few females. The veranda screen was open five hours and 

 I caught 114 females of T. trijunctus, 4 females of T. americanus, 

 and 18 T. lineola, 1 Chrysops sp. 



There were light showers all day. The male T. americanus 

 was here in far greater numbers than that of T. trijunctus, some 

 were quite small and some seemed over large. 



The junior author spent May 2 at Hobe Sound (Jupiter Island) 

 and Stuart, Florida, leaving Miami at 5.30 a.m. The gadflies 

 (T. trijunctus) became common at Fort Lauderdale: they were 

 a pest at West Palm Beach (there had been very few at Miami). 

 On Juptier Island T. trijunctus was by far the commonest gadfly. 

 T. americanus and flavus were also present. 



Residents at Hobe Sound state that gadflies were about and 

 annoying from the first of May till June 10. 



Gadflies were abundant wherever the saw palmetto was in bloom. 

 One could find them most abundant by following the blooming of 

 palmetto from southward to the north. 



On May 3 it was very cool and cloudy at dawn and there was a 

 very light flight of T. americanus at Paradise Key. 



It was cool all day and there was very little activity among the 

 gadflies. I saw plenty of males in the jungle but they were not 

 active. A very few were feeding. I saw a few on cabbage aim 

 bloom, which was just then opening. 



May 4. The temperature was 58F. at dawn anil damp. 

 The flight lasted thirteen minutes and but few flies on the wing- 

 were strong enough to make a distinct hum. They kept high in 

 the air and did not hover as much as on warm mornings. They 

 kept darting high in the air and none were low enough to capture. 



The night hawk and "chuck will widow" both caught flies on 

 the wing. The birds kept flying up and down the roadway and 

 I distinctly observed them to pick flies out of the air on the wing. 



May 5. Temperature 56F. No flight; very few T. trijunctus 

 around screens all day. I saw a dragon fly catch T. trijunctus 

 on the wing and come to ground to devour it, also saw another 

 dragon fly catch T. trijunctus from the screen. Very few T. 

 americanus were visible all day. Heavy winds were blowing and 

 it was fairly cool in the afternoon. No males were on palmetto, 

 flowers in the open. 



May 6. No flight. Weather continued cool with high winds 

 No males of T. trijunctns or americanus observed all day. T. 

 americanus seemed more susceptible to cold weather than T. In'- 



