46 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 17 
1922 and 1923 are given, as well as a brief statement as to the species that were 
observed to be of most importance as pests of livestock in this locality. 
During 1920 the Tabanidae of Louisiana were made the subject of a 
project of the Louisiana Experiment Stations. In the June, 1923, 
number of the Journal of Economic Entomology we gave a resumd 
of the progress of this project up to the end of 1922, insofar as observa¬ 
tions made supplemented what has been published by Professor J. S. 
Hine, who made a study of the horseflies of the State during 1905 and 
1906. (See Circular No. 6 of the Louisiana State Crop Pest Com¬ 
mission and Bulletin No. 93 of the Louisiana Agricultural Experiment 
Station). 
It is our purpose to here record briefly, and in a similar manner, 
observations made during 1923. 
In our previous paper we added the names of 14 species to the 40 
species of Tabanidae that Professor Hine recorded as occurring in 
Louisiana. Only one additional species, which has been determined by 
Professor Hine, can now be added. This is Tabanus nefarius Hine, a 
single female of which was taken at Reserve on August 31. 
Notes on Immature Stages 
Since the project was begun in 1920 adults of 4 species of the genus 
Chrysops and 15 species of the genus Tabanus have been reared from 
larvae collected in the field. Several species that, as adults, have been 
noted to be common about livestock have not yet been taken in the 
larval stage. 
In our previous paper we referred to 10 species that had been reared 
from larvae. While additional adults of some of these have been reared 
during 1923, only the collecting and rearing of the remaining 9 species 
need be considered at present. The larvae of these 9 species have been 
taken in water or in close proximity to it. During the year more 
attention has been given to drier areas in searching for the immature 
stages than was previously the case, but we still appreciate the fact that 
such areas should be more thoroughly examined, as well as bodies of 
water differing in type and surroundings from those to which we have 
so far given most of our attention. 
In our rearing work we have continued to keep larvae in moist sand in 
small glass jars in a well-ventilated insectary. Only one larva is 
placed in a jar and earthworms are provided as food. Professor Hine 
has very kindly determined for us several adults that have been reared 
or collected in the field during 1923. 
