54 N. J. Ac.RlCULTURAL EXPERIMENT StAT'OX, BuLLETIX 348 



caping them is infinitesimal. Any waters to which these fishes have 

 free access will be searched in vain for mosquito larvae."* 



In the years 1914 and 191 5 Dr. F. E. Chidester undertook and car- 

 ried out an intensive study of the fish enemies of the salt-marsh 







Fig. 25. Nature of breeding pool — Surface view. 



mosquitoes. The investigations showed clearly that the common 

 killy (Fundulus hetcroclitus) is by far the most important fish ene- 

 my of the salt-marsh mosquito but that the fresh-water killy {Fun- 

 dulus diaphanous Le Seur), the sheepshead minnow (Cyprinodon 

 variegatus Lacipede), and the top minnow (Gambusia affinis) are 

 commonly associated with it and play a strong secondary part. 

 Dr. Chidester's studies showed that this common killy migrated to 



*Smith, J. B., 1904, N. J. Agr. Exp. Sta. Report on Mosquitoes, p. 93, 94. 



