Ultraestrutura dos ovos de duas espécies de Anopheles (Anopheles) Meigen, 1818 (Diptera, Culicidae). A ultraestrutura dos ovos de duas espécies morfologicamente semelhantes da Série Arribalzagia, Anopheles (A.) costai Fonseca & Ramos, 1939 and A. (A.) mediopunctatus (Lutz, 1903), é descrita e ilustrada usando-se microscopia eletrônica de varredura.. Embora sejam morfologicamente semelhantes nos estádios adulto, estruturas da genitalia masculina, larva de quarto estádio e pupa, os ovos destas duas especies são distintos. Os ovos de A. costai e A. mediopunctatus são comparados com os de A. forattinii Wilkerson & Sallum, 1999. Apresenta-se a ilustração incompleta do ovo de A. forattinii para comparação com os ovos das outras duas espécies.

Egg ultrastructure of two morphologicaly similar species of the Arribalzagia Series, Anopheles (A.) costai Fonseca & Ramos, 1939 and A. (A.) mediopunctatus (Lutz, 1903) are described and illustrated using scanning electron micrographs. Although similar in the adult stage, male genitalia structures and larval and pupal stages, the eggs of these species are distinct. The eggs of A. costai and A. mediopunctatus are compared with that of A. forattinii Wilkerson & Sallum, 1999. Incomplete illustration of egg of A. forattinii is provided for comparison.

Anopheles galvaoi, a member of the subgenus Nyssorhynchus, is redescribed based on morphological characters of the adults male and female, fourth-instar larva and pupa. Female, male genitalia, larval and pupal stages are illustrated. Data about medical importance, bionomics, and distribution are given based on literature records. Adult female of An. galvaoi can be easily misidentified as An. benarrochi Gabaldón and An. aquasalis Curry. A few characters are indicated for identifying female and immatures of An. galvaoi. Phylogenetic relationships among An. galvaoi and six other species of the Oswaldoi Subgroup are estimated using COII mtDNA and ITS2 rDNA gene sequences. Lectotype of An. galvaoi, an adult female from Rio Branco, State of Acre, is invalidated.