Aedes agastyai Tewari & Hiriyan, 1992.
Subfamily Culicinae, tribe Aedini, genus Aedes. Subgenus Tewarius includes four species, which are divided between two species groups, the Agastyai Group (Ae. agastyai, Ae. reubenae) and the Nummatus Group (Ae. nummatus, Ae. pseudonummatus). Subgenus abbreviation – Tew.
The adults of species of subgenus Tewarius are very similar to those of subgenus Downsiomyia but differ in having dorsocentral setae and pale scales on the postspiracular area. The large patch of pale scales on the anterior half of the scutum is somewhat similar in species of subgenera Phagomyia and Himalaius, but species of Tewarius differ in numerous other features, especially features of the male and female genitalia. The moderately long and thin maxillary palpus of Tewarius males bears some resemblance to certain species of subgenus Scutomyia, but species of Tewarius otherwise exhibit major differences in features of the adult, larval and pupal stages. The forked gonostylus of Tewarius males is somewhat similar to the condition in some Afrotropical species of subgenus Diceromyia, but the latter differ in having the inner arm of the gonostylus much shorter than the outer arm. The larvae of Tewarius are similar to those of subgenus Petermattinglyius but differ in the development of seta 1-S. Pupae of Tewarius and Ae. gilli of subgenus Himalaius have a very long single seta 1-Pa but differ noticeably in the positions of setae 6,9-VII and 9-VIII.
The following features are most distinctive of species of subgenus Tewarius. ADULTS – Vertex of head covered with broad decumbent scales, erect forked scales restricted to occiput; eyes contiguous above antennal pedicels; maxillary palpus short, about 0.2 length of proboscis in females, 0.4–0.5 length of proboscis in males, males with 5 palpomeres; approximately anterior half of scutum covered with white scales; supraalar area dark-scaled; acrostichal setae absent; dorsocentral setae present; midlobe of scutellum with broad scales; mesokatepisternum with large patch of broad white scales extending from upper area to lower posterior area; lower mesepimeral seta absent; fore- and midungues equal in females and unequal in males, each with one tooth, hindungues equal in both sexes. FEMALE GENITALIA – Tergum VIII and sternum VIII with numerous broad scales; insula tongue-like with 1 or 2 distal tuberculi; upper vaginal sclerite large; cercus short with few scales on dorsal surface; 3 spermathecal capsules. MALE GENITALIA – Tergum IX lobes broad, with several setae; gonocoxite short, with apical and basal lobes on dorsomesal margin; gonostylus split near mid-length into 2 narrow arms, lateral arm with minute apical setae, mesal arm with stout gonostylar claw at apex; claspette comprised of basal setose plaque; aedeagus comprised of 2 lateral sclerites bearing numerous elongate teeth; cercal setae absent. LARVAE – Seta 4-C short, branched, inserted mesal and slightly posterior to seta 6-C; seta 5-C long, branched, inserted posterolateral to seta 4-C and posteromesal to setae 6,7-C; seta 6-C very long, normally single, inserted lateral to setae 4,5-C and slightly posteromesal to seta 7-C; seta 13-C branched; antenna with few spicules; setae 2,4-A long; setae 1,3-P branched, shorter than seta 2-P; seta 4-M, 6-T and 13-T branched, 13-T long; seta 6-II shorter than seta 6-III; seta 1-VII single, long; setae 2,4-VIII branched; comb with 20–32 scales in patch; seta 1-S multi-branched, inserted distal to pecten; pecten comprised of numerous long slender evenly spaced spines; saddle incomplete; ventral brush (seta 4-X) with several long multi-branched cratal setae and 2 or 3 short precratal setae; grid with well-developed transverse bars; setae 2,3-X single (2-X occasionally double). PUPAE – Setae 3-CT, 3-I–III, 6-II and 5-IV–VI single and very long, seta 3-CT noticeably longer than seta 1-CT; seta 3-I noticeably longer than seta 6-I, seta 3-II,III noticeably longer than following tergum; seta 6-II shorter than seta 3-II; seta 5-IV–VI longer than following 2 terga; paddle ovoid, margin without hair-like spicules; seta 1-Pa single (rarely split apically), very long, about length of paddle. See Aedes.
The cladistic analysis of extensive morphological data by Reinert et al. (2009) placed Tewarius in a clade with six other Old World subgenera of Aedes: Polyleptiomyia + (Bifidistylus + (Albuginosus + (Tewarius + (Christophersiomyia + (Huaedes + Leptosomatomyia))))). In the phylogeny of Wilkerson et al. (2015), Tewarius fell within a three-way polytomy that included Christophersiomyia and a clade comprised of (genus Armigeres + (subgenus Alanstonea + genus Eretmapodites)) + (subgenus Huaedes + subgenus Leptosomatomyia).
Tewarius are forest species. Immature stages have been found in tree holes, bamboo stumps, cut bamboo and once in a broken bottle in jungle. Nothing is known about the bionomics of the adults.
Species of subgenus Tewarius are not of medical and economic importance to humans.
Oriental Region. Three species are known from India (Ae. agastyai, Ae. nummatus, Ae. reubenae) and one from Thailand (Ae. pseudonummatus).
Agastyai Group (see).
Nummatus Group (see).