MASICERA. 113 
thickened on the proximal half. Thorax grey, with four distinct black stripes, which are prolonged 
behind the transverse suture, the outer stripes extending to the hind margin ; scutellum cinereous, with 
blackish reflections. Abdomen short-ovate ; first segment black ; second and third segments cinereous, 
with a black dorsal stripe and two oblong black reflecting spots; anal segment cinereous, at the sides 
faintly yellowish, without black markings, in the male densely beset with black pile and bristles; macro- 
cheetse only on the hind margins of the second and third segments. Tibia of the front and hind legs 
with a row of short bristles ; middle tibie with some longer bristles. Tegule whitish. Wings greyish- 
hyaline ; small cross-vein distinctly before the middle of the discal cell ; apical and posterior cross-veins 
oblique and nearly straight. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
A male and a female specimen. 
19. Masicera dejecta, sp. n., °. 
Cinereous ; head yellowish ; frontal band, four thoracic stripes, reflections on the abdomen, antenna, and legs 
black; palpi rufous; hind tibie with a row of bristles; apical cross-vein straight. 
Length 6°5 millim. 
Allied to the following species, M. sordida and M. calcarata, but differing from them in the apical cross-vein 
being straight, not concave. Head pale ochraceous; the front not narrowed behind, nearly as broad as 
the eyes; the frontal band as broad as the pale ochraceous lateral portions ; above the vibrissee is a row of 
shorter bristles, reaching to nearly half the face. Antenne shorter than the face, their third joint four 
times as long as the second; the arista thickened in its proximal third. Proboscis black. Thorax and 
scutellum yellowish-cinereous; thoracic dorsum with four black stripes of nearly equal breadth, these 
being prolonged behind the transverse suture. Abdomen elongate-oval, truncate at the anus ; first segment 
black ; the following segments cinereous, with black hind borders, blackish reflecting spots, and a black 
dorsal stripe, and with macrochete on the hind margins. Front tibie with short bristles; middle 
tibie with some long bristles ; hind tibiee outwardly with a row of short bristles and a longer one below 
the middle. Tegule whitish. Wings nearly hyaline; small cross-vein before the middle of the discal cell ; 
apical cross-vein oblique and straight (the curvation of the fourth vein forming a blunt angle); posterior 
cross-vein slightly curved. 
Hab. Mexico, Amula in Guerrero 6000 feet (7. H. Smith). 
A single female specimen. 
20. Masicera sordida, sp. n., 2. 
Cinereous; head silvery-white ; frontal band, four thoracic stripes, hind borders of the abdominal segments, 
antenne, and legs black; palpi and terminal lips of the proboscis rufous; hind tibie with a row of 
bristles. 
Length 7-8 millim. 
Face perpendicular; front not narrowed behind, nearly as broad as the eyes; frontal band a little narrower 
than the silvery-white lateral portions ; frontal bristles descending on each side to the number of three 
beneath the root of the antennz ; cheeks narrow ; vibrissee surmounted by some shorter bristles. Antenne 
a little shorter than the face; second joint bristly; third joint four times as long as the second; arista 
thickened in its proximal half. Thorax cinereous, with four black stripes (the intermediate stripes 
linear, the outer ones broader)—two and two united behind the suture, but not reaching the posterior 
margin ; scutellum cinereous, with a black reflecting spot on the disc. Abdomen ovate, truncated at the 
tip ; first segment black ; the following segments cinereous, with blackish reflections and shining black 
hind borders, and sometimes with a black dorsal stripe; macrochete only on the hind margins of the 
segments. The middle tibie have some long bristles, the fore and hind tibie a row of short bristles 
on their outer edge. Tegule white. Wings with a brownish-grey tint; small cross-vein distinctly 
before the middle of the discal cell; apical and posterior cross-veins slightly curved. 
BIOL. CENTR.-AMER., Dipt., Vol. I1., May 1890. qg 
