118 PROC. ENT. SOC. WASH., VOL. 20, XO. 6, JUNE, 1918 



soon collected on the inside. On the 24th there was a heavy fog 

 and the flight started later but was more pronounced. 



There was a strong flight on March 25. More flies were pres- 

 ent on live stock, which had streams of blood on noses and 

 lower part of legs. All stock was protected with bagging and sprays 

 of vile smelling oils which had but little effect and had to be 

 applied frequently. 



On March 26 the temperature was so cool until sunrise that 

 there was no flight. All during the day, however, the flies were 

 very annoying to people as well as stock. 



This morning, March 27, there was a very strong flight lasting 

 21 minutes in all. Temperature 54F. at sunrise; it rained lightly 

 in the afternoon. 



March 28-29 normal flights occurred. The weather was dry and 

 warm and there was evidence of new freshly emerged adults 

 arriving, with undamaged wings. 



On the mornings of March 30 and 31 I (Mosier) made the 

 interesting discovery that many of the flies were inverted, i.e., 

 upside down, when hovering during flight. 



The flights of April 1 and 2 have convinced me that many, if 

 not all, the flies were upside down when hovering. The swarm was 

 on the decline; there were not so many flies. Tabanus trijunctus 

 Walker had appeared. 



On the 3rd there was a strong flight. Observations were made 

 near the Lodge or about | mile farther west than on the 1st and 

 2nd (near the rock pit and eastward to entrance). The swarm 

 lasted nineteen minutes. I again observed flies inverted. There 

 was a difference in tone when inverted and normal. 



From the 4th and 5th the flight was very strong. I walked to 

 about half mile east of the hammock and the sound was very 

 pronounced at that distance, although no flight occurred outside 

 of the edge of the hammock. 



April 6 the flight was normal; adults of T. americanus diminish- 

 ing in numbers but trijunctus on the increase. 



On the 7th there was a strong, early flight, lasting twenty-one 

 minutes. The weather was cloudy and cool. As the days 

 lengthened the flight began correspondingly early by watch but 

 comparatively the same by dawn. 



The weather was warm arid foggy in the mornings of April 8 

 and 9 but there were strong and long flights, that on the 9th 

 lasting twenty-one minutes. I observed two flies to strike each 

 other in mid air, both coming to the ground. 



On April 10 the weather was cooler and the flight was lighter. 

 I observed that T. trijunctus was not as active in the early morning 

 hours as T. americanus. During the day many adults 'of T. 

 americanus were observed feeding on the bloom of swamp bay 

 (T. pnbescens), also on the bloom of saw palmetto. 



