The hitherto unknown adult and pupa of Culex (Melanoconion) simulator Dyar and Knab 1906 from near the type-locality in Trinidad are described, and an additional description of the larva is given. The male genitalia, female cibarial armature, and chaetotaxy of the pupa and larva are figured. A new record of this species from Panama is noted. Characters are given to separate simulator from the closely related jubifer Komp and Brown 1935.