February, ’24] jones and bradley: tabanidae of Louisiana 
49 
plants along the brook where the larva was taken. Pupation took place 
during the week of July 23 and a female adult issued on August 2. 
The larvae of two species of tabanids have been taken in the vicinity 
of Baton Rouge under somewhat interesting circumstances. Through 
the removal of large quantities of earth for dike building purposes 
during the last of April and the first of May, 1922, and the subsequent 
filling of this excavation with water, a rather extensive pool was formed 
in an area which had previously been comparatively high ground. 
Wild grasses, rushes, and other aquatic plants later grew up in the pool 
and during the winter and spring of 1923 larvae of Chrysops flavidus Wd. 
were found in large numbers in the mud at the edge of the water and 
about the submerged bases of grass stools. Larvae of Tabanus lineola 
Fab. were also common along the edge of the water. These larvae, with 
the exception of those which died, were reared to adults before Septem¬ 
ber, 1923. This strongly indicates that the life-cycle of the two species 
normally extends over at least no more than one year. 
Notes on Adults 
Field observations have been continued in the vicinity of Baton 
Rouge for the purpose of ascertaining when the adults of various tab¬ 
anids occur in this section and the relative importance of the various 
species, especially as pests of livestock. In making these observations 
collections have been made from time to time from horses, mules, and 
cattle, as well as about man, in areas where horseflies are most abundant. 
(The following table gives, in a brief way, information of this nature 
that has been obtained during 1922 and 1923.) 
Seasonal Occurrence of Adult Tabanids in the Vicinity of Baton Rouge 
as Indicated by Collections Made During 1922 and 1923 
Species 
Chrysops callidus O. S. 
flavidus Wied. 
fulvistigma Hine 
montanus O. S. 
ohsoletus Wied. 
pikei Whit. 
seperatus Hine 
vittatus Wied. 
Months in which adults were Period of greatest 
taken. abundance 
April, May, June April 
April, May, June, July, August 
September, October April and May 
May - 
cU 
May -- 
May, June, July, August, 
September, October June 
April, May, June, August, 
October April 
April —■- 
April, May, June, July, Au¬ 
gust, September, October June and September 
