144. Harley, J. M. B. 1965. Seasonal abundance and diurnal varia- 



tions in activity of some Stomoxys and Tabanidae in Uganda. 

 Bull. Entomol. Res. 56(2): 319-332. 



145. Harris, R. L., W. F. Chamberlain, and E. D. Frazar. 1974. 



Horn flies and stable flies: free choice feeding of methoprene 

 mineral blocks to cattle for control. J. Econ. Entomol. 67(3): 

 384-386. 



With 0.94, 0.12, and 0.01 percent methoprene in mineral blocks, 

 development of H. i. irritans in the field was inhibited 87 percent. 

 Bioassay data in the laboratory indicated better than 97 percent 

 inhibition. 



146. E. D. Frazar, and R. L. Younger. 1973. Horn flies, stable 



flies, and house flies: development in feces of bovines treated 

 orally with juvenile hormone analogues. J. Econ. Entomol. 

 66(5): 1099-1102. 



H. i. irritans development was inhibited in feces of cattle 

 treated orally with 1 g/day of Hoffman-La Roche Ro7-9767 

 and 0.7 mg/day of Zoecon ZR-515. 



147. J. A. Miller, and E. D. Frazar. 1974. Horn flies and 



stable flies: feeding activity. Ann. Entomol. Soc. Am. 67(6): 

 891-894. 



An electronic bitometer was used to determine the feeding 

 activity of H. i. irritans feeding on a cow. Females spent an 

 average of 163 min/day in feeding and averaged 38.4 feedings/ 

 day. Males averaged 24 feedings/day and spent an average of 

 96 min/day in feeding. In the laboratory female horn flies aver- 

 aged 10 feedings/day and spent an average of 15.3 min/day in 

 feeding. 



148. Hasegawa, T., H. Hayakawa, and T. Chiba. 1973. Sand flies in 



Tohoku area, Japan. (In Japanese.) Jpn. J. Sanit. Zool. 

 23(4): 271. 



149. Haufe, W. O. 1970. An economic evaluation of horn fly control 



on yearling cattle treated with DDT and coumaphos. Annu. 

 Meeting Can. Soc. Anim. Production Proc, July 5-9, Ottawa, 

 pp. 48-49. 



150. 1973a. Horn fly. Can. Agric. Insect Pest Rev. 51: 48. 



151. 1973b. Interaction of pesticidal toxicity, parasites, and 



reversible anticholinesterase activity as stresses on growth rate 

 in cattle infested with horn flies (Haematobia irritans). Toxi- 

 col. Appl. Pharmacol. 25(1): 130-144. 



Differential rates of gain in groups of immature cattle exposed 

 to H. i. irritans attack were used to distinguish the interaction of 

 pesticidal activity and nonpesticidal pharmacologically induced 

 stress with host-parasite reaction. 



15 



