122 DIPTERA. 
penultimate joint scarcely recognizable (apparently somewhat elongate). Proboscis black ; palpi pale 
rufous, infuscated at the tip. Thorax and scutellum cinereous, the thorax anteriorly white ; thoracic dorsum 
with four distinct stripes. Abdomen elongate-oval, cinereous, without any yellowish tint, with blackish 
reflections; some macrochete on the hind margins of the segments; ventral surface blackish-grey. 
Front tibize with short bristles; middle tibia with some long bristles; hind tibie outwardly with bristles 
of unequal length. Tegulea white. Wings greyish, near the base with a brownish-yellow tint; small 
cross-vein a little before the middle of the discal cell; apical cross-vein concave; posterior cross-vein 
very slightly curved. 
Hab. Mexico, Santiago Iscuintla in Jalisco (Schumann). 
A single female specimen. 
11. Prospherysa macilenta, sp. nc. 
Body slender ; shining black; head, the thorax anteriorly and laterally, and the front borders of the second 
and third abdominal segments whitish; palpi rufous. 
Length 6-5 millim, 
Front as broad as the eyes, black, with whitish reflections; frontal band as broad as the lateral portions ; 
frontal bristles not descending beneath the root of the antenne ; face and cheeks white; facial ridges with 
rather weak bristles, which mount up half the face. Antenne black, shorter than the face; basal joints 
short ; third joint slender, five times as long as the second; arista thickened in its proximal half; the - 
extreme base of the third antennal joint and the thickened portion of the arista somewhat rufous. 
Proboscis black ; palpi dark rufous. Thorax with a whitish tomentum, which is most conspicuous before 
the transverse suture (where it is interrupted by four black stripes) and on the pleurw; scutellum black, 
with whitish reflections. Abdomen distinctly longer than the thorax, convex, rather narrow, shining 
black ; first segment as long as the second; front borders of the second and third segments with a white 
reflection; macrochete long, on the hind margins of all the segments. Legs black (the intermediate pair 
are broken off); front femora outwardly with a whitish tomentum ; tibie with several lorg bristles ; foot- 
claws and pulvilli somewhat elongate. Tegule bone-white. Wings greyish-hyaline; small cross-vein 
on the middle of the discal cell; third vein slightly undulate; apical cross-vein oblique and straight ; 
posterior cross-vein distinctly curved, inserted nearly in the middle between the small cross-vein and the 
curvation of the fourth vein. . 
Hab. Mexico, Orizaba (F. D. G. & H. H. Smith). 
A single male specimen. 
12. Prospherysa apicalis, sp. n.,¢ 2. 
Blackish ; head ochraceous; thorax greyish, with four black stripes; abdomen with grey and white reflections, 
the anal segment yellowish-rufous; palpi rufous. 
Length 8-9 millim. 
Front a little narrowed behind (¢), broader than the eyes (2); frontal band black; frontal bristles on each 
side in a single row, and descending as far as the end of the second antennal joint ; the female with some 
lateral bristles ; cheeks without bristles or hairs. Antenne black, reaching to near the vibrisse; second 
joint with some bristles; third joint five or six times as long as the second; arista indistinctly jointed, 
thickened to beyond the middle. Proboscis black; palpi dark rufous. Thorax with grey, anteriorly 
with white tomentum; thoracic dorsum with four equal black stripes, which posteriorly become less 
conspicuous in the more general black coloration behind the transverse suture; scutellum blackish. 
Abdomen ovate, blackish, with some grey and white reflections, which usually appear as a narrow white 
front border to the second and third segments, and laterally are more extended ; sometimes a black dorsal and 
two black lateral spots become conspicuous on these segments; anal segment ochraceous, with a reddish 
tint ; macrochete are on the hind margins of the first three segments, and more irregularly, though 
shorter, on the anal segment; ventral surface densely clothed with black hairs. Legs black; front tibia 
