ABSTRACT: The siphon indices, branching of setae 5-C and 6-C, lengths of 5-C compared to the lengths of 6-C, length of the most proximal seta 1-S compared to the siphon length, and the occurrence of a paler abdominal segment IV were compared among Culex apicalis, Cx. boharti and Cx. territans larvae. These characters in Cx. territans were found to be much more variable than previously recognized, and often overlapping completely with these characters in Cx. apicalis and Cx. boharti. The use of male genitalia characters on reared adults from larval collections is the best means of separating these species, particularly where they are sympatric or in close proximity.