FLIES THAT FREQUENT HOUSES 37 



mon in barns. It breeds in vegetable refuse, manure, 

 and excrement. 3 Hcematobia serrata, the horn fly, is 

 similar, but much smaller. It is occasionally found in 

 houses ; common on cattle, 

 cc. With blunt mouth-parts (Fig. 6). 



d. Last section of vein M of the wing with abrupt angle. 

 e. Thorax with four longitudinal lines and without 



golden hairs. House-fly, Mwca domestica. 

 ee. A larger fly with no lines on thorax but with golden 



FIG. 14. Wing of stable-fly (M. stabulans). (x 8.) 



hairs. Cluster-fly, Pollenia rudis. 

 dd. Last section of vein M of the wing with a broad gentle 



curve (Fig. 14). 



/. Eyes microscopically hairy; each abdominal seg- 

 ment with 2 spots. Larvae are found in dung 

 and excrement. Myiospila meditabunda. 

 ff. Eyes bare; abdomen gray and brown marbled. 

 Muscina assimilis with black legs and feelers, 

 and Muscina stabulans with legs more or less 

 yellowish, and which breeds in decaying vege- 

 table substances, dung, and excrement, are fre- 

 quently found in houses. 



