364 Annals Entomological Society of America [Vol. VIII, 
ally to the Central and Southern States from New York and 
other States where this species commonly occurs. One expla- 
nation of this possible barrier will be found in the fact that 
H. bovis is generally later in emerging from the backs of cattle 
than H. lineata, The grubs emerging from the backs of cattle 
shipped to the Southern States would, on account of this later 
date of emergence, encounter excessively hot weather and this 
may account in part at least for the failure of the species to 
establish itself in the warmer portions of the country. It may 
be of interest to note that on April 23, 1914, Dr. W. E. Hinds 
sent in three specimens of this species from the experiment 
station at Auburn, Alabama. These were obtained from the 
back of a young bull which had recently been shipped from 
New York. 
