182 



SCHOOL ENTOMOLOGY 



rains will make them ideal breeding places for the stable fly. 

 Animals scatter the straw and add manure, which makes 

 conditions more favorable. It is important, therefore, that 

 straw which is to be fed be stacked with the sides nearly 

 vertical and the tops rounding, so as to shed rain. All straw 

 not required for feed should be burned or, better, scattered 



FIG. 130. Hodge type window trap. At left, trap with end removed 

 to show construction; at right, cross-section of trap placed in a 

 window. (After Bishopp, U. S. Dept. Agr.) 



A, end of trap; B, upper side of folds in screen; C, lower side of folds in screen; 

 nd of trap sawed out and returned after attaching screen; E, holes 



D, portion of e 



g apex of f . 



low sash; /, inside entrance for flies; O, outside entrances. 



along apex of folds; F, door for removing^ dead flies; G, window sill; //, upper 

 indo 



over the fields and plowed under. Stacks not used during 

 the winter should be destroyed in the spring, before the 

 flies commence to multiply rapidly. In portions of a stack 

 of straw in Gainesville, Texas, in March, 1913, as many as 

 300 pupae were found in a single cubic foot of straw. 



The flies may be caught as they enter or leave the stable 

 by means of traps built in the window frames, as devised by 



