ee. Arista also with rays below; vein M1+2 more strongly bent, the apical cell hence less widely open.
f. Palpi strongly spatulate at the tips, lower rays of the arista about six in number, B. sanguinolentus. South Asia. Bdellolarynx Austen
ff. Palpi feebly spatulate; apical cell of the wing narrowly open slightly before the tip; sternopleurals black, anterior bristle sometimes absent. H. atripalpis. Europe. Hæmatobosca Bezzi
dd. Vein R4+5 with setæ at the base.[L]
e. Veins R1 and R4+5 with setæ at the base; two equally prominent sternopleural macrochætæ; arista with rays both above and below; palpi as long as the proboscis; apical cell of the wing wide open. L. tibialis. (Hæmatobia B. B. not R. D.). Lyperosiops Town.
ee. Only vein R4+5 with basal setæ; anterior sternopleural macrochæta wanting; arista pectinate.
f. Palpi as long as the proboscis, the latter stout, with fleshy terminal labellæ; apical cell narrowly open; sternopleural macrochætæ black. S. maculosa from Africa and related species from Asia. Stygeromyia Austen
ff. Palpi much shorter than the proboscis, the latter pointed at the apex, without fleshy labellæ; apical cell of the wing wide open. S. calcitrans, the stable fly and related species. Widely distributed in both hemispheres ([fig. 110]). Stomoxys Geof.
aa. Proboscis neither slender nor elongate, the labellæ fleshy and not adapted for piercing.
b. Hypopleuræ without a vertical row of macrochætæ. Muscinæ