Subgenus Bironella Theobald, 1905

The following combinations of characters distinguish species of subgenus Bironella from those of subgenera Brugella and Neobironella. ADULTS – Vertex with pale scales and setae, some scales forked apically; occiput with dense dark erect forked scales; interocular space with long pale scales and setae; antenna strongly verticillate in males, weakly verticillate in females, flagellar whorls attached near base of flagellomeres; maxillary palpus nearly as long as proboscis in males, 0.50–0.75 length of proboscis in females, with dense dark brown scales; anterior promontory with patch of pale piliform scales; upper proepisternum setose; cell R2 of wing short, 0.20–0.25 length of vein R2+3; radio-medial crossvein distal to origin of vein M3+4; hindfemur pale-scaled on ventral and most of posterior surfaces to near apex, hindtibia pale on anterior surface from basal 0.10–0.50. MALE GENITALIA – Gonocoxite without scales, basotergal area with well-developed projection; aedeagus long, slender, rod-like, leaflets at apex; claspette absent. LARVAE – Seta 2-C long, single; seta 3-C as long or nearly as long as seta 2-C, single to 5-branched; setae 5–7-C multi-branched, 0.67–0.75 length of head capsule. PUPAE – Trumpet notched at apical margin; seta 13-CT absent, alveoli present; seta 9-II–VII short, stub-like; paddle with fringe of spicules on outer and inner margins. See genus Bironella.