112 DIPTERA. 
16. Masicera flavescens, sp. n., ?. 
Yellowish-cinereous ; frontal band, four lines on the thorax, narrow hind borders to the abdominal segments, 
antenne, and legs black ; palpi yellow. 
Length 5°5 millim. . 
Front a little broader than the eyes, not narrowed behind; frontal band narrower than the yellowish lateral 
portions, not reaching the vertex; frontal bristles descending on each side in a single row beyond the 
second antennal joint; face slightly retracted, with white reflections ; vibrissa accompanied by some 
other bristles. Antenne distinctly shorter than the face; second joint bristly; third joint three times 
as long as the second; arista thickened to the proximal half, the thickened part with some pubescence 
(which, however, is only visible under a strong lens). Proboscis black; palpi yellow, cylindrical. 
Thoracic dorsum and scutellum yellowish-cinereous ; four black lines are conspicuous before the trans- 
verse suture, but obliterated behind it; pleure grey, with the grooves black. Abdomen ovate; first 
segment black; the following segments yellowish-cinereous, with blackish reflections and narrow black 
hind borders; macrochete on the hind margins of the second and third segments and several on the anal 
segment ; ventral surface black, with whitish reflections. Hind tibia outwardly with bristles of unequal 
length. Tegule whitish. Wings grey ; small cross-vein on the middle of the discal cell ; curvation of 
the fourth vein with a somewhat rounded angle; apical cross-vein nearly straight ; posterior cross-vein 
slightly curved. 
Hab. Mexico, Cuernavaca (H. H. Smith). 
A single female specimen. 
17. Masicera bilineata, sp. n., 2. 
Whitish-grey ; frontal band, antennz, two lines on the thorax, broad hind borders to the abdominal segments, 
and legs black; palpi pale rufous. 
Length 6°5 millim. 
Head with silvery-white reflections ; frontal band nearly as broad as the whitish lateral portions; frontal 
bristles descending to the number of three beneath the root of the antenne ; face a little retracted, but 
not prominent at the oral margin. Antenne nearly as long as the face; third joint four times as long as 
the second; arista thickened to its proximal third. Thoracic dorsum with black stripes, the two median 
stripes linear and more conspicuous than the others; base of the scutellum black. Abdomen subconical, 
shining black; the front borders of the second and following segments with white reflections; first 
segment shorter than the second; macrochete strong but not numerous, on the second and third 
segments only at the hind margins. Legs with scattered bristles. Tegule white. Wings greyish; small 
cross-vein perpendicular, a little before the middle of the discal cell; curvation of the fourth vein with 
a blunt angle; apical and posterior cross-veins nearly straight, the latter midway, or nearly so, between 
the-small cross-vein and the curvation of the fourth vein. 
Hab. Mexico, Temax in North Yucatan (Gaumer). 
A single female specimen. 
18. Masicera curta, sp.n., ¢ 2. 
Cinereous ; frontal band, four stripes on the thorax, three stripes on the abdomen, antenne, and legs black ; 
palpi rufous, | | 
Length 7 millim. 
Of a short form. Head yellowish-white; front of the male narrowed behind, nearly as broad as the eyes, in 
the female a little broader; frontal band narrower than the yellowish-white lateral portions; frontal 
bristles in the male numerous and descending on each side in a double row, or somewhat irregularly, 
beneath the root of the antenne-—in the female they are more robust and fewer in number; cheeks 
broad ; vibrissee accompanied by several other bristles. Antenne distinctly shorter than the face; second 
joint bristly and with white reflections; third joint three times as long as the second; arista a little 
