Rachisoura Theobald, 1910

ADULTS ‒ Unornamented mosquitoes; vertex of head entirely or largely with dark decumbent scales, ocular scales white or whitish, 3‒6 ocular setae on either side; clypeus sometimes with scales; maxillary palpus of females 0.17‒0.30  length of proboscis, maxillary palpus of males 0.2‒1.0 length of proboscis; scutum with mainly narrow scales; acrostichal and dorsocentral setae absent; prescutellar setae reduced or absent; mesopostnotum with cluster of few minute setae (always?); postpronotal setae reduced or absent; scales of thoracic pleura white or whitish; subspiracular scales present; wing scales all broad (Filipes Group) or broad only toward apex of wing (Vanleeuweni Group); all femora with anterior surface usually entirely dark-scaled, tibiae and tarsi dark-scaled; hindungues always paired; pale scaling of abdominal terga white or whitish. FEMALE GENITALIA – Insula with 10‒35 setae in longitudinal band on either side of midline; 3 spermathecal capsules. MALE GENITALIA – Large, not retracted (fully exposed); ninth tergal lobes with slender or flattened setae; lateral plate of aedeagus with sternal lobe. LARVAE – Maxilla with short apical tooth and large articulated maxillary claw (adaptation for grasping; homologous with maxillary brush); hypostomal suture incomplete, not reaching posterior tentorial pit; seta 15-C inserted approximately midway between collar and anterior margin of labiogula; seta 6-M single, long, slender; seta 7-T strongly developed, long, multi-branched; seta 8-M,T very small, multi-branched; seta 14-I‒VI minute or absent; siphon without lateral seta. PUPAE – Seta 1-CT normally long, single, sometimes double; seta 1-I strongly developed; punctures, when present, only on terga III and IV; seta 9-VII,VIII usually well developed; paddle usually with more or less conspicuous spicules at apex. See genus Tripteroides.