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



junctus. Very few T. trijunctus females were present today and 

 few T. lineola and Chrysops. 



I saw 1 T. flavus about sundown at the screen. 



May 7. T. americanus made a strong but short flight. The 

 males seemed more numerous than females. I saw a small wasp or 

 bee worrying a male T. americanus around a palmetto bloom but 

 evidently it was not large enough to capture him. 



A large spider with yellow web tangles many T. americanus and 

 T. trijunctus in its web and devours them promptly. 



T. trijunctus were gradually getting scarcer. I think there wciv 

 fewer now than of T. americanus. This was most unusual. 

 They are usually just coming on as T. americanus disappears. 

 No egg masses discovered so far although I searched Sagittaria 

 leaves diligently. 



May 10. No further flights of T. americanus. 'The veranda 

 screen was < pen for five hours f n May 8 and I nett d 66 females of 

 T. lineola, 21 females of T. trijunctus and 2 females of T. ameri- 

 canus. Very few T. americanus males in evidence. 



I saw an interesting flight of male Tandbus lineola Fabr. 

 at dusk. About 200 or more specimens were hovering much the 

 same as T. americanus except all were from 5 feet to 8 feet 

 from the ground on the rock road east of Royal Palm Hammock. 

 They broke out spontaneously like a swarm of bees, the flight 

 lasting about eight minutes or until dark. I succeeded in knocking 

 down 5 specimens. All were males. 



May 11. All T. americanus observed on the tree trunks today 

 were males. There was a preponderance of males to females. Just 

 now in T. trijunctus the females predominate. 



On May 8, a few females of T. americanus were collected at 

 Paradise Key. 



May 13, females of T. lineola were observed. At dusk females 

 of T. flavus were very common- at the north side of the house, but 

 were restless and wary. 



On May 16, a female of a brown tabanid T. turbidus Wied. 

 made its first appearance in 1918, at Paradise Key. 



Females of T. americanus were collected on May 25, which is a 

 late record for 1918. 



On May 30, numerous females of T. flavus were caught. The 

 color of these beautiful greenish yellow Tabanids can be preserved 

 by treating them with formalin for forty-eight hours. 



On June 2 another species of Tabanid made its appearance, i.e., 

 T. melanocerus Wied.; it has different habits from T. trijunctus; 

 it is very shy. It appears only when the latter species has about 

 disappeared. 



On June 9 the water was very low in the Everglade prairies, the 

 weather was exceedingly warm and the hammock (Paradise Key) 



