74 DIPTERA. 
black; middle tibize with some long bristles; hind tibiw outwardly fringed with bristles; foot-claws and 
pulvilli elongate, the pulvilli yellowish. Tegule yellowish-white. Wings greyish-hyaline; small cross- 
vein oblique, on the middle of the discal cell; apical cross-vein slightly concave near its base; posterior 
cross-vein curved. 
Hab. Mexico, Venta de Zopilote 2800 feet, and Dos Arroyos 1000 feet, in Guerrero 
(H. H. Smith). 
Four male specimens. 
26. Exorista flavicans, sp. n., s. 
Head and abdomen ochraceous; thorax cinereous; four thoracic stripes, antenne, and legs black ; palpi 
rufous ; abdomen with brown reflections, and without discal macrochete. 
Length 7 millim. 
Front, cheeks, and posterior orbits of the eyes ochraceous; face in the middle yellowish-white ; occiput grey ; 
front broader than the eyes; frontal band black, narrower than the lateral portions; frontal bristles 
descending beneath the second antennal joint ; faceslightly inclined ; bristles above the vibriss# mounting 
up nearly half the face; pilosity of the eyes yellowish ; beard white. Antenne as long as the face ; 
basal joints short, the second with two short bristles; third joint stout, six times as long as the second ; 
arista thickened in its proximal half. Proboscis black; palpi dark rufous. Thorax and scutellum 
yellowish-cinereous ; thoracic dorsum with four black stripes; scutellum with black reflections. Abdomen 
broadly ovate, with brown reflecting spots, a black hind margin to the second segment, and a black 
dorsal stripe ; macrochete rather long, on the hind margins of the second and following segments. 
Middle tibiz with some long bristles; hind tibiz outwardly with a row of bristles, two of which (one 
below the middle, the other before the tip) are longer than the others; foot-claws and pulvilli elongate, 
the pulvilli yellowish. Tegule whitish. Wings greyish-hyaline ; small cross-vein on the middle of the 
discal cell ; apical cross-vein nearly straight ; posterior cross-vein slightly curved. 
Hab. Mexico, Orizaba (fF. D. G. & H. H. Smith). 
A single male specimen. 
27. Exorista griseomicans, sp. n., ¢ 2. 
Greyish ; scutellum and abdomen of the male more or less testaceous; face with silvery reflections ; frontal 
band, four thoracic stripes, hind margins of the abdominal segments, antenna, and legs black; palpi 
rufous; no discal macrochete. 
Length 10°5 millim. 
Of a light grey coloration. Front of the male narrowed behind, of the female as broad as the lateral portions ; 
frontal bristles on both sides in a single row, some of them descending beneath the root of the antenne ; 
vibriss surmounted by some shorter bristles; beard white; pilosity of the eyes short. Antenne nearly 
reaching the oral margin ; second joint bristly ; third joint four or five times as long as the second ; arista 
thickened for less than its proximal half. Proboscis black, sometimes with yellowish terminal lips ; palpi 
pale rufous. Thoracic dorsum with four broad black stripes, which are more or less united two and two 
behind the transverse suture ; scutellum usually testaceous. Abdomen ovate ; the first segment, the poste- 
rior margin of the second and third segments, and the anus black ; the remainder of the surface with dark 
brown, in the male somewhat testaceous, reflections ; on the hind margins of the first and second segments 
are two dorsal macrochete and a single one on each side; on the hind margin of the third segment a row 
of about seven macrochete, and there are also several round the anus. Legs with scattered bristles; hind 
tibia outwardly with short bristles, between which, helow the middle, is a longer bristle; foot-claws 
and pulvilli elongate in the male, the pulvilli yellowish. Tegule greyish-white. Wings greyish ; small 
eross-vein before the middle of the discal cell; fourth vein with a rectangular curvation ; apical crosgs- 
vein slightly concave; posterior cross-vein a little curved. 
