122 PROC. ENT. SOC. WASH., VOL. 20.. NO. 6, JUNE, 1918 



On April 27 there was a strong flight at the usual hour "dawn." 

 The weather was clear and much warmer; the flight was corre- 

 spondingly heavier; duration fourteen minutes. 



I found an unusual number of males on palmetto leaves and 

 flowers, also on shrubbery and trees south of the house. The 

 males were so plentiful that it ceased to be sport to search and col- 

 lect them. To date have not captured any females during the 

 morning flight. Am sure there are only males in Tabanid flight. 



In the afternoon there was a heavy rain and hence no observa- 

 tions were made. 



April 28. Weather threatened rain, cloudy and cool. The 

 flight was light, lasting only eight minutes. There was rain during 

 the day and there were very few T. trijunctus in evidence; quite a 

 few T. americanus males were on trees throughout the jungle. 



On April 28 the junior author collected a large series of Tab anus 

 psammophilus Osten Sacken along the Ocean on sand, at Miami 

 Beach. Both males and female were collected. They were colored 

 like the sand and flew like Cicindela, and were difficult to catch. 

 Females were full of eggs. 



On April 29 there was a heavy morning flight. I saw many 

 male T. americanus, also a few females in the jungle. T. trijunctus 

 were very scarce. More adults of T. lineola were present than in the 

 last week, also more Chrysops. sp. 



April 30 there was a flight of short duration but strong ; I noticed 

 males of T. americanus feeding in palmetto as soon as the dew 

 was off the plants; they were quite abundant. 



In the afternoon I noticed males of T. americanus seek the shade, 

 very few were feeding in the strong sunshine; they also sought 

 fresh blooms. I counted 10 males of T. americanus on one stalk, 

 with 2 blooms all in the shade. I caught 11 T. americanus 

 males, 2 females; 2 males T. trijunctus. There were a few T. 

 trijunctus around the veranda screen. No. T. flavus adults have 

 been seen since April 19; but few T. lineola were present. 



From 12 m. to 4 p.m. I canvassed the palmetto bloom where 

 I had cut the fans from blooms. I caught 41 males of T. ameri- 

 canus and 23 males of T. trijunctus ; 8 T. americanus females and 

 424 T. trijunctus on the screen, all being females; 31 adults of 

 T. lineola were also caught. 



The females of T. trijunctus were predominant both on the screen 

 and on flowers. I do not think I caught more than 50 per cent 

 of the males seen. 



As soon as the leaves were cut from the flowers T. americanus 

 males sought new feeding grounds, either for shade or security. 

 The exposure did not have the same effect on either sex of T. 

 rijunctus. T. lineola was also feeding on palmetto flowers. 



May 1. The morning flight was strong but of short duration. 

 All were high in the air and I could not catch any on the wing but 

 I observed 3 light on trees, all proved to be males! 



