218. Levy, R., and H. L. Cromroy. 1973. Concentration of some ma- 



jor and trace elements in forty-one species of adult and imma- 

 ture insects determined by atomic absorption spectroscopy. 

 Ann. Entomol. Soc. Am. 66(3): 523-526. 



Cu, Fe, Mg, Na, and K content of adult H. i. irritans was 

 determined. 



219. Lloyd, D. H., and 0. 0. Dipeolu. 1974. Seasonal prevalence of 



flies feeding on cattle in northern Nigeria. Trop. Anim. Health 

 Prod. 6(4): 231-236. Abstr. in Rev. Appl. Entomol. 63(5): 

 329-330. 



Two species of Haematobia were among insects caught in a 

 survey of flies on cattle. 



220. Lugger, 0. 1897. Parasites of man and domesticated animals. 



Minn. Agric. Exp. Stn. Annu. Rep. (1896): 188-192. 



221. Luttermoser, G. W. 1947. The use of the new insecticides in 



the control of extoparasites of animals. Univ. Pa. Bull. 

 (School Vet. Med., Vet. Ext. Q. :107) 47(28) : 68. 



222. Ma, C. 1959. A preliminary report on the synanthropic flies of 



Northeastern China. (In Chinese.) Acta Entomol. Sin. 9(3): 

 266. 



Lyperosia exigua {=H. i. exigua) and L. titillans ( = H. t. 

 titillans) were collected. 



223. MacQueen, A. 1973. Horn fly breeding, nitrogen loss, and nu- 



trient immobilization associated with cattle dung in the southern 

 interior of British Columbia. Simon Fraser Univ. Ph.D. Dis- 

 sertation. 213 pp. 



224. and B. P. Beirxe. 1974. Insects and mites associated 



with fresh cattle dung in the southern interior of British Colum- 

 bia. J. Entomol. Soc. Brit. Columbia 71: 5-9. 



H. i. irritans was among the 67 insect species found to be as- 

 sociated with dung in B.C. 



225. and B. P. Beirxe. 1975a. Dung burial activity and fly 



control potential of Onthophagus nuchicornis (Coleoptera: Sca- 

 rabaeinae) in British Columbia. Can. Entomol. 107(11): 1215- 

 1220. 



Beetle activity in the field had little effect on the horn fly as 

 the beetles ceased burial activity before midsummer when horn 

 flies reached their greatest numbers. 



226. and B. P. Beirxe. 1975b. Influence of other insects on 



production of horn fly, Haematobia irritans (Diptera: Muscidae) 

 from cattle dung in south-central British Columbia. Can. En- 

 tomol. 107(12): 1255-1264. 



23 



