Culex tarsalis Coquillett, which was first collected in New Jersey in 1975, reappeared on the eastern coast of the state during the summer of 1977. From August 12 to October 3, 9 specimens were trapped from 3 separate counties. The present distribution of Cx. tarsalis is adjacent to areas where western encephalitis is known to be endemic in wild birds. The public health significance of these findings is discussed.