64 DIPTERA. 
4. Kxorista ceruleiventris, sp. n., °. 
Cinereous ; frontal band, antenne, a narrow hind border to the abdominal segments, and legs black ; abdomen 
with a bluish reflection, and with discal and marginal macrochete; palpi pale rufous. 
Length 8 millim. 
Front cinereous, broader than the diameter of the eyes; frontal band narrower than the lateral portions ; frontal 
bristles descending on both sides to the number of three beneath the root of the antenne ; face and 
cheeks whitish ; vibrissee surmounted by some shorter bristles. Eyes with a short greyish pile. Antenne 
a little shorter than the face ; third joint nearly four times as long as the second; arista thickened for not 
quite half its length. Thorax, scutellum, and abdomen with a yellowish-cinereous tomentum; thoracic 
dorsum with four dark lines, the outward lines disappearing behind the transverse suture. Abdomen 
broadly ovate, convex; the last two segments with a peculiar bluish reflection ; first segment and a narrow 
hind border to the following segments, black. Front tibise outwardly with a row of short bristles; middle 
tibi with some long bristles ; foot-claws and pulvilli short. Tegule greyish-yellow. Wings greyish, 
slightly infuscated on the costa and along some of the veins ; small cross-vein distinctly before the middle 
of the discal cell; apical cross-vein concave ; posterior cross-vein curved. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
A single female specimen. 
5. Exorista ordinaria, sp. n., ¢ ¢. 
Cinereous ; frontal band, antenne, four thoracic stripes, hind borders of the abdominal segments, and legs 
black; abdomen with discal and marginal macrochete ; palpi rufous. 
Length 5°5—7 millim. 
Front with a slight ochraceous tint, in the male narrower than the diameter of the eyes, in the female broader ; 
frontal bristles descending on both sides in a curved row, to the number of three or four, beneath the root 
of the antenne ; face and cheeks whitish ; vibrisse surmounted by some shorter bristles ; beard whitish ; 
eyes thinly pilose. Antenne black; second joint bristly ; third joint three or four times as long as the 
second ; arista thickened for nearly half its length. Proboscis black; palpi pale rufous. Thorax with a 
greyish-cinereous, on the shoulders somewhat ochraceous, tomentum, and with four black stripes, which 
are interrupted at the transverse suture; scutellum cinereous, blackish at the base. Abdomen conical, 
longer than the thorax ; first segment black, the others cinereous with black reflections, the black colour on 
these latter usually appearing as a broad hind border to the segments. Legs rather strong ; intermediate 
tibize with a long and stout bristle on the outer side below the middle and another still lower down on the 
inside; the outer edge of the hind tibie with shorter, partly with long bristles ; foot-claws and pulvilli 
elongate in the male, the pulvilli yellowish. Tegule whitish. Wings nearly hyaline; small cross-vein 
before the middle of the discal cell; apical cross-vein rather straight; posterior cross-vein slightly curved. 
Hab. Mexico, Venta de Zopilote in Guerrero 2800 feet, Medellin near Vera Cruz, 
Teapa in Tabasco (H. H. Smith). 
Three male and two female specimens. 
6. Exorista brevis, sp. n., 9. 
Ovate, blackish, partly with greyish tomentum; thoracic stripes obsolete; frontal band, palpi, and scutellum 
rufous ; abdomen not longer than the thorax, with discal and marginal macrochete. 
Length 6°5 millim. 
Front somewhat broader than the eyes, blackish, with white reflections; frontal band dark rufous; frontal 
bristles descending to beneath the end of the second antennal joint; face and cheeks white, the cheeks 
silvery. Antenne black; second joint rufous at the tip; third joint three times as long as the second ; 
arisia slightly thickened at the base. Proboscis black; palpi rufous. Thorax black, anteriorly and 
