224 



Annals Entomological Society of America [Vol. VI, 



Some of the flies reared in a hot green house lacked the white 

 hairs along the abdomen, which characterize the species. Prof. 

 Williston tells me that these hairs were absent from specimens 

 taken in Mexico and doubtfully referred to this species by 

 Osten Sacken. 



Showing the distribution area of the host species. (A of the legend.) 

 The area blocked out is generous including all the probable territory. 

 The crosses (B of the legend) represent state and country records. 

 The round dots (C of the legend) represent some of the definite 

 localities from which the fiy has been recorded. 



