DIPTERA. 453 
“margin before the scutellum; the pleuree have whitish reflections. Abdomen cylindrical, rufous, with a 
yellowish front-border to the segments; the last two segments are blackish-brown and the preceding ones 
show traces of brown dorsal spots; on the hind margin of each segment, except the first, are two dorsal 
macrochetw. Legs black; the coxee with white reflections ; the base of the femora is rufous, this colour 
on the hind pair extending over the proximal half; foot-claws and pulvilli elongate. Tegule yellowish ; 
halteres rufous. The blackish coloration of the wings is faded towards the hind-border; small cross-vein 
under the end of the first vein and beyond the middle of the discal cell; apical cell shortly petiolated ; 
posterior cross-vein slightly curved, a little beyond the middle between the small cross-vein and the 
curvature of the fourth vein. 
Hab. Mexico !, Atoyac in Vera Cruz (H. H. Smith), Orizaba (coll. Bellard?). 
A single male from each locality. 
2. Xanthomelana rubicunda. 
Xanthomelana rubicunda, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 188°. 
Thorax black, with yellow and whitish markings; head white; abdomen and legs rufous; antenne, frontal 
band, and scutellum black; wings blackish, darker at the base and along the costa. 
Length 4°5 millim. 
Front narrower than the diameter of the eyes; frontal band velvety-black, the sides yellow; face and cheeks 
white. Antenne black; third joint double as long as the second; arista a little thickened on its proximal 
half, not visibly jointed. Thorax black, a humeral spot and two points on the anterior margin pale 
yellow; hind margin, metanotum, and pleure with whitish reflections; scutellum velvety-black. 
Abdomen cylindrical, rufous; the last two segments, except the front margin, shining dark brown; two 
dorsal macrochetz on the hind margin of each segment. Coxe and femora rufous, the anterior coxe 
with white reflections; tibie brown, the hind pair with some scattered bristles on their onter edge ; 
tarsi black ; foot-claws and pulvilli short. Tegule and halteres yellowish. Small cross-vein under the 
end of the first vein and beyond the middle of the discal cell; posterior cross-vein straight, in the middle 
between the small cross-vein and the curvature of the fourth vein. 
Hab. Mexico 1, Teapa in Tabasco (H. H. Smith). 
A single specimen. On account of its narrow front and the shape of the anal 
segment, I take it to be a male. 
3. Xanthomelana dorsalis. 
Xanthomelana dorsalis, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 188°. 
Thorax black, with yellow markings; abdomen yellow, with a black dorsal band; legs black, the coxa, and 
base of the femora yellow ; anterior half of the wings black. 
Length 7 millim. 
Front as broad as the eyes, velvety-black, narrowly bordered with yellow at the sides; face and cheeks pale 
yellow ; occiput grey. Antenne black; third joint nearly twice as long as the second. Proboscis black ; 
palpi pale rufous. Thorax black; the shoulders, the pleure, and a narrow margin before the scutellum 
yellow ; sometimes the black colour before the transverse suture is formed by four broad stripes ; 
scutellum black. Abdomen cylindrical, yellow, with a black band, which is sometimes interrupted at 
the sutures of the segments, and then forms a row of dorsal spots ; on the last segments the black colour 
is usually more extended, especially in the female; fifth segment in the male slightly prolonged 
inferiorly into a small nipple; male-genitalia but little developed ; some short macrochetze at the hind 
margin of the segments. Legs black ; coxe and base of the femora yellowish-rufous, the coxe on the 
front side with white reflections; middle and hind tibice with some rather long bristles ; foot-claws and 
pulvilli elongate in the male, the pulvilli yellowish. Tegule yellow. Wings grey, the base and costa 
BIOL. CENTR.-AMER., Dipt., Vol. IT., May 1903. 3 9 
