daily horn fly counts indicated that bulls were the most attrac- 

 tive. Treated steers were more attractive than control steers 

 6 to 9 days after treatment. Regression analysis indicated a posi- 

 tive relationship between horn fly attractance and sebaceous 

 gland parameters. 



69. Cockrill, W. R. 1974. The buffaloes of Latin America, pp. 



676-707. In Cockrill, W. R. (ed.) 1974. The Husbandry and 

 Health of the Domestic Buffalo. FAO, Rome. 993 pp. 

 Buffalo flies {Haematobia) did not appear to exist in Brazil. 



70. Collins, J. E., and C. J. Wainweight. 1934. Some Diptera col- 



lected in the south of England in 1930-33. J. Soc. Brit. Entomol. 

 1(1): 21. 



H. i. irritans was found in Arne, Dorset. 



71. Cowsert, W. C, J. W. Scales, and J. W. Ward. 1945. DDT 



starts work for dairy farmers. Miss. Farm Res. 8(12): 1-2. 



72. Creelman, I. S. (ed.) 1968. Horn fly. Can. Agric. Insect Pest 



Rev. 46: 25. 



73. 1969. Horn fly. Can. Agric. Insect Pest Rev. 47: 32. 



74. 1970. Horn fly. Can. Agric. Insect Pest Rev. 48: 34. 



75. 1971. Horn fly. Can. Agric. Insect Pest Rev. 49: 38. 



76. 1972. Horn fly. Can. Agric. Insect Pest Rev. 50: 35. 



77. Cress, D. C, and T. R. Greathouse. 1972. Evaluation of differ- 



ent methods of controlling face and horn flies on beef cow herds. 

 Mich. Agric. Exp. Stn., Res. Rep. Xo. 166: 81-82. 



Horn flies were controlled with 1 percent coumaphos dust bags ; 

 partial control was obtained with 7 percent phenothiazine salt 

 blocks. 



78. Crystal, M. M. 1967a. Carbon dioxide anesthesia of untreated 



and chemosterilant-treated screwworm flies, Cochliomyia homini- 

 vorax (Coquerel). J. Med. Entomol. 4(4): 418. 



79. 1967b. Reproductive behavior of the laboratory-reared 



screwworm flies. (Diptera: Calliphoridae). J. Med. Entomol. 

 4(4): 445. 



80. Czerxy, L., and G. Strobl. 1909. Spanische dipteren. III. 



Beitrag. Vehr. Zool.-Bot. Ges. Wien 59: 235. 



H. i. irritans was collected in Spain. 



81. Dalrymple, W. H. 1913. Some of the more important insects 



affecting our farm animals. Am. Vet, Rev. 42: 424-427. 



82. D'Assrs Foxseca, E. C. M. 1968. Diptera: Cyclorrhapha; 



Calyptrata. Section (b) Muscidae. Handbooks for the Identifi- 

 cation of British Insects 10: Pt. 4 (b), p. 12. 



8 



