PROC. ENT. SOC. WASH., VOL. 21, NO. 8, NOV., 1919 191 



able flight the heaviest up till that time of the season. Two 

 males of T. americanus were shot down during the flight at dawn; 

 as usual, no females were observed in the flight. 



On March 15 it was raining and there was no flight of T. amer- 

 icanus. On March 16 it was cooler with high winds; on March 

 17 there w r ere high winds and no flight; fewer females of T. amer- 

 icanus were in evidence, the weather being squally. The tem- 

 perature on March 18 was 68 F., and too cool for a flight; the 

 numbers of females of T, americanus on tree trunks and screen 

 were increasing. On March 19, it was cool and there was no 

 flight, but numbers of females of T. americanus were increasing 

 on the screens and in the woods. 



On March 21, the temperature was as low as 42 F. at day- 

 break; there was no flight. March 22, with a temperature of 

 only 58, witnessed the heaviest flight of the season. However, 

 the flight had not yet reached the full proportions of last season. 

 Numerous female adults of T. flavus were collected on this date. 

 There was a slight rain in the afternoon. On March 23 there was 

 a strong flight of Tabanus americanus. One female adult of T. 

 trijunctiis was collected on the veranda screen on this date. 



The dawn was clear and it was warm on March 24; there was 

 a strong flight of T. americanus. One male of T. trijunctus was 

 captured in the hammock. 



On April 2 the early morning flight of T. americanus was strong ; 

 three males were shot while hovering; all that have so far been 

 shot have been males. By April 3 to 4 the flight seems to have 

 reached its full height. 



On April 5, 6 and 7 the flight continued normal. 



April 8, 9 and 10 dawned with a heavy fog and no flight; on 

 April 10 the males were feeding on flowers in the forest, keeping 

 well in the shade during sunshine. 



On April 11 there was a bright dawn, and a strong flight one 

 of the loudest and strongest flights ever witnessed. 



From April 12 to 10 the flight continued to be strong (at its 

 height) ; two adults were observed to strike in mid-air, descend- 

 ing to the brush below, clasped; they escaped before their sex 

 could be determined. 



On April 17 there were light show r ers at dawn; there was no 

 flight. April 18 was cloudy and there was a very light flight of 

 but few minutes' duration. 



From April 19 to 21 there were moderate flights. Females 

 were later seen on saw palmetto blossoms. 



On April 22 T. trijunctus was at the height of its season and 

 adults were very annoying to both man and beast; the adults 

 gathered in automobile tops, followed teams, etc. All work ani- 



