Key for the Identification of Fourth Stage Mosquito Larvae Associated with Dengue Virus Transmission in the Oriental Region 1. Head. Antenna spiculate (Fig. 115); seta 1 ­A branched (Fig. 115); seta 4 ­C usually caudad to seta 6 ­C (Fig. 116). Abdomen. Siphon with acus (Fig. 117)......................... ......................................................................... Ochlerotatus (Finlaya) niveus subgroup Head. Antenna smooth (Fig. 118); seta 1 ­A single (Fig. 118); seta 4 ­C cephalad to seta 6 ­C (Fig. 119). Abdomen. Siphon without acus (Fig. 120).......................................... 2 FIGURE 118. FIGURE 119. Aedes (Stegomyia) aegypti. FIGURE 120. Aedes (Stegomyia) aegypti. 2 (1). Abdomen. Ventral brush (4 ­X) with 5 pairs of setae (Fig. 121); seta 4 ­a,b X branched (Fig. 121); comb scale with stout, subapical spines (Fig. 122).............................................................................................................. Aedes (Stegomyia) aegypti Abdomen. Ventral brush (4 ­X) with 4 pairs of setae (Fig. 123); seta 4 ­a, b X single (Fig. 123); comb scale without subapical spines (Fig. 124)....................................... ....................................................................................... Aedes (Stegomyia) albopictus FIGURE 122. Aedes (Stegomyia) aegypti. FIGURE 124. Aedes (Stegomyia) albopictus. Explanation of Notes a Ochlerotatus (Finlaya) niveus subgroup mosquitoes have been incriminated as vectors of dengue of humans in the forests. They transmit the dengue virus in monkeys in high tree canopies. Out of 11 species of Ochlerotatus (Finlaya) niveus subgroup in the Peninsular Malaysia, 9 species were found attracted to humans, both at ground and tree canopy levels, namely: Oc. albolateralis (Theobald), Oc. inermis (Colless), Oc. leonis ( Colless), Oc. litoreus (Colless), Oc. niveoides (Barraud), Oc. novoniveus (Barraud), Oc. pseudoniveus (Theobald), Oc. subniveus (Edwards), and Oc. vanus (Colless) (Rudnick and Lim 1986). b Aedes albopictus, the Asian tiger mosquito, can be distinguished from related species by the presence of broad flat white scales on the lateral margin of the scutum just before the level of the wing root; other species have only narrow curved white scales in this position. When scutal markings are rubbed off, Ae. aegypti can be easily misidentified as Ae. albopictus. It can be distinguished by having separated white scale patches on the mesepimeron, whereas they are connected in Ae. albopictus.

Published as part of Leopoldo M. Rueda, 2004, Pictorial keys for the identification of mosquitoes (Diptera: Culicidae) associated with Dengue Virus Transmission, pp. 1-60 in Zootaxa 589 on pages 46-49, DOI: 10.5281/zenodo.169153