454 SUPPLEMENT. 
black, the black colour reaching the fourth vein and becoming more dilute in the apical cell; small eross- 
vein beyond the middle of the discal cell; petiole of the apical cell rather long; posterior cross-vein 
convex, in the middle between the small cross-vein and the curvature of the fourth vein. 
Hab. Mexico1, Rio Papagaio, Xucumanatlan, and Omilteme in Guerrero (H. H. 
Smith), Atoyac in Vera Cruz (Schumann). 
Several specimens of both sexes. The females previously referred by me! to 
X. gracilenta really belong here. 
4, Xanthomelana trigonalis. 
Xanthomelana trigonalis, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 188°. 
Yellow; frontal band, three stripes on the thorax, trigonal dorsal spots on the abdomen, antenne, and legs 
black ; wings blackish along the costa. 
Length 7:5 millim. 
Head white; front as broad as the eyes; frontal band broad, black; antenne black, the third joint nearly 
twice as long as the second ; proboscis black; palpi pale rufous. Thoracic dorsum pale yellow, with three 
broad black stripes, which are slightly interrupted at the transverse suture; pleure grey, with blackish 
reflections; scutellum black. Abdomen yellow, the base and the trigonal dorsal spots black, these spots 
being extended laterally to the narrow hind margins of the segments; macrochete short. Legs black, 
the coxe grey on the front side; tibize with some bristles ; foot-claws and pulvilli elongate, the pulvilli 
greyish. Tegule whitish. Wings grey, blackish along the costa; apical cell pointed and very shortly 
petiolated; small cross-vein beyond the middle of the discal cell; apical cross-vein slightly concave ;. 
posterior cross-vein somewhat curved. 
Hab. Mexico1, Xucumanatlan in Guerrero 7000 feet (H. H. Smith). 
A single male specimen. 
5. Xanthomelana gracilenta. (Tab. XIII. fige. 14, ¢; 14a, wing.) 
Aanthomelana gracilenta, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 189 (¢ nec ?)'. 
Thorax black, with yellow or whitish markings; head yellow or white; frontal band, antenne, and legs black ; 
abdomen yellow, with a dorsal band and the last segment black ; tegule and halteres pale yellow ; costal 
half of the wings blackish. 
Length 4°5 millim. 
Front a little narrower than the diameter of the eyes; frontal band velvety-black ; sides of the front, face, and 
cheeks bright yellow ; occiput greyish. Antenne black; third joint oval, one and a half times as long 
as the second; arista a little thickened at the base, tapering towards the end; palpi rufous. Thorax 
black, before the transverse suture with a bright yellow tomentum, which is interrupted by four broad 
black stripes; behind the suture the yellow tomentum extends along the sides and borders the posterior 
margin of the thorax, surrounding thus a large black dorsal spot; on the pleure are some irregular grey 
spots and an oblique band of the same colour. Abdomen cylindrical; the yellow parts somewhat trans- 
parent ; the first segment black on the dorsal side, the second and third with a broad dorsal band, which 
is sometimes interrupted at the incisures, the last segment black; in the female the black colour is 
extended in such a- manner that there is only on each side a large yellow spot; on the hind margins of 
the segments are two dorsal and some lateral macrochete. The hind tibie have some bristles on their 
outer edge; foot-claws and pulvilli elongate, the pulvilli fuseous. The blackish coloration on the costal 
portion of the wings is not sharply limited, and the rest of the surface is grey; the venation is nearly 
the same as that of X. articulata. 
Hab. Mexico!, Rincon in Guerrero (1. H. Smith). 
