An entomological study was carried out in Bhelukhel, Bode and Tathali of Bhaktapur district to
compare fl uctuation in population size of Culex mosquitoes in relation to relative humidity and
temperature. Mosquitoes were collected during July-December 2012 around the pig enclosures
and cattle sheds by means of dark activated rechargeable CDC light trap. The study resulted
73.41% of Culex mosquitoes out of the total mosquitoes collected (884). Total eleven species
of Culexmosquitoes were recorded namely Cx. tritaeniorhynchus, Cx. fuscocephala, Cx. gelidus,
Cx. vishnui, Cx. pseudovishnui, Cx. bitaeniorhynchus, Cx. quinquefasciatus, Cx. edwardsi, Cx.
hutchnsoni, Cx. whitei and Cx.whitmorei. Distribution of Culexspecies was abundant in July and
August. Cx. quinquefasciatus, the principal vector of Lymphaticfi lariasis (LF) was recorded to be
the most dominant species in all the three sites. Cx. tritaeniorhynchus, the principal Japanese
encephalitis (JE) vector was collected in higher number during August from Tathali and Bode
site and during July from Bhelukhel site. Signifi cant variation was not observed in abundance
of Culex mosquito in three study sites in six different months.