124 DIPTERA. 
15. Prospherysa serotina, sp. n., ¢. 
Greyish ; frontal band, hind borders of the abdominal segments, antenme, and legs black ; frontal band nearly 
as broad as the lateral portions; palpi rufous. 
Length nearly 6 miliim. 
Closely allied to P. minuta, but somewhat larger in size. The frontal band is broader; the facial bristles are 
less numerous, short, and weak, mounting to half the face; the palpi are pale rufous; the small cross- 
vein is placed scarcely before the middle of the discal cell, and the apical cross-vein is straight. 
Hab. Mexico, near the city (H. H. Smith). 
A single female specimen. 
16. Prospherysa parvipalpis, sp.n.,3 9. (Phospherysa parvipalpis, Tab. III. 
figg. 15, head in profile; 15 a, wing.) 
Cinereous; head whitish; antennee (at least their basal joints), frontal band, and palpi rufous; thorax with 
four black stripes; first abdominal segment, hind borders of the following segments, and legs black ; 
apical and posterior cross-veins very oblique. 
Length 5-7 millim.. 
Front a little narrowed behind, in the female broader than the eyes; frontal band as broad as the lateral 
portions, truncated on the vertex; frontal bristles descending on each side in @ curved row to a little 
beneath the second antennal joint ; the bristles on the vertex robust. Face perpendicular; facial bristles 
mounting to where the frontal bristles finish; beard white. Antenne a little shorter than the face ; 
second joint bristly ; third joint linear, four times as long asthe second, infuscated towards the tip, some- 
times wholly blackish; arista thickened in its proximal half. Palpi very small, filiform. Thoracic dorsum 
with four black stripes, these heing partly visible even behind the transverse suture; scutellum blackish 
on the basal half. Abdomen conical; first segment black, shorter than the following segments; second 
segment with a black hind border, this border in the middle being extended into a pair of black quadrate 
dorsal spots; on the third segment the hind border has a similar coloration, which, however, is broader 
and excised in the middle; on neither of these segments are discal macrochete present; ants shining 
black ; ventral surface densely clothed: with black pile, especially towards the anus. Legs with scattered 
bristles ; foot-claws and pulvilli somewhat elongate. Tegule whitish. Wings hyaline; apical cell ending 
at some distance from the wing’s tip; fourth vein at its curvation with a longitudinal fold, which resembles 
a prolongation of the vein; small cross-vein beyond the middle of the discal cell ; apical and posterior 
cross-veins very oblique, the latter in or before the middle between the small cross-vein and the curvation 
of the fourth vein. 
Hab. Mexico, Northern Sonora (Morrison), Presidio (Forrer), Tepetlapa 3000 feet, 
and Omilteme 8000 feet, both in Guerrero (H. H. Smith). 
A female and three male specimens. 
17. Prospherysa balteata, sp. n., 2. 
Cinereous ; head whitish; frontal band, four thoracic stripes, hind borders of the abdominal segments, antenna, 
and legs black. 
Length 5:5-6°5. millim. 
Closely allied to the preceding species, but differing in the black colour of the antenne and frontal band. The 
palpi are more developed, pale rufous, cylindrical. The stripes on the thorax are more distinct. The 
venation of the wings agrees with that of P. parvipalpis, except that the small cross-vein rests on the 
middle of the discal cell, and the posterior cross-vein is beyond the middle between the 
small cross-vein 
and.the curvation. of the fourth vein.. 
