Handbook of Medical Entomology

by William A. Riley; O. A. Johannsen

f. The fourth and fifth segments of the fore tarsi black; antennæ black ([fig. 164]). G. palpalis R. D.

ff. Otherwise marked. G. bocagei, tachinoides, pallicera.

ee. First three segments of the hind tarsi are yellow, the fourth and fifth segments are black.

f. Fourth and fifth segments of the first and second pair of tarsi are black.

g. The yellow bands of the abdominal segments occupy a third of the segment ([fig. 165]). G. morsitans Westw.

gg. The yellow band on each segment of the abdomen occupies a sixth of the segment. G. longipalpis Wied.

ff. Tarsi of the first and second pairs of legs wholly yellow. G. pallidipes Austen

cc. Rays of the arista not plumose; only one or two sternopleurals; base of the media not strongly bowed down; apical cell opens at or very near the apex of the wing.

d. Vein R₄₊₅ without setæ at the base; palpi about as long as the proboscis.

e. Arista pectinate (i. e. rays on one side only), the rays often undulate; two yellow sternopleurals often difficult to detect; vein M₁₊₂ only slightly bent, the apical cell hence wide open. The horn fly, H. irritans (= Lyperosia serrata) and related species. Widely distributed (figs. [167], [168]). Hæmatobia R. D. not B. B.