The influence of climatic factors on the seasonal frequency of mosquitoes (Diptera: Culicidae) at the Peixe Angical hydroelectric scheme (Tocantins, Brazil) was evaluated in the present paper. Mosquito surveys were conducted in the municipality of Peixe and in areas surrounding the reservoir in the municipalities of Paranã and São Salvador do Tocantins during two daytime periods (10 am-12 noon and 2 pm-4 pm) and two night-time periods (6 pm-8 pm and 6 pm-10 am) over 14 months. In total, 10,840 specimens from 42 species were captured, 84.5% of which belonged to the Culcinae. The most common species were
Anopheles darlingi
,
Psorophora albipes
and
Sabethes chloropterus
. The number of Culicidae specimens was higher in months with higher rainfall and air humidity than during the drier months. The large population of
Ps. albipes and the presence of both
An. darlingi (primary vector for human malaria parasites) and
Haemagogus janthinomys
(primary vector for yellow fever virus) are highlighted.
