82 DIPTERA. 
discal cell; curvation of the fourth vein with an acute angle, and a fold on the wing’s surface, simulating 
a continuation of the vein; apical cross-vein slightly concave at the base; posterior cross-vein curved 
inwards. 
Hab. Muxico, Rincon in Guerrero 2800 feet (H. H. Smith). 
A single female specimen. 
11. Phorocera cylindrata, sp. n.,¢. 
Shining black; head white; thorax partly whitish, with obsolete black stripes; abdomen cylindrical, the 
second and third segments with whitish front borders. 
Length 5:5 millim. 
Head white, somewhat silvery, the cheeks with a rufous reflection; front scarcely narrowed behind, nearly as 
broad as the eyes; frontal band black; frontal bristles on both sides in a single row, and not descending 
beneath the root of the antenne; pilosity of the eyes and beard whitish. Antenne black, shorter than 
the face; second joint bristly; third joint four times as long as the second ; arista thickened at the base. 
Proboscis and palpi (so far as they are visible in the unique specimen) rufous. Thorax, scutellum, and 
abdomen shining black; thorax laterally and anteriorly with whitish tomentum ; four black stripes appear, 
in certain lights, before the transverse suture. Abdomen nearly cylindrical; second and third segments 
with a whitish tomentum, which is most distinct on the front borders; on the anal segment is a similar 
tomentum, but only at the sides; discal and marginal macrochaxte are present. Legs black ; middle tibiz 
with some long bristles; hind tibie outwardly with bristles of unequal length; foot-claws and pulvilli 
elongate, the pulvilli yellowish. Tegule whitish. Wings greyish ; small cross-vein under the end of the 
first vein and on the middle of the discal cell; curvation of the fourth vein with a blunt angle; apical 
and posterior cross-veins oblique, the apical straight, the posterior slightly curved. 
Hab. Mexico, Chilpancingo in Guerrero 4600 feet (7. H. Smith). 
A single male specimen. . 
This species is easily recognizable from others of the genus by its small size and 
cylindrical form. 
12. Phorocera immaculata, sp.n.,¢ 2. 
Thorax cinereous, with four stripes; head whitish; abdomen, antenne, and legs black ; palpi rufous; no discal 
macrocheetee on the abdominal segments. 
Length 9-12°5 millim. 
Front slightly prominent, yellowish-cinereous, in the male as broad as, in the female a little broader than, the 
eyes ; frontal band blackish, narrower than the lateral portions ; frontal bristles robust, on both sides in 
a curved row, distinctly descending beneath the second antennal joint, the lowest bristle close to the eyes ; 
face and cheeks white, in the male somewhat silvery; eyes not quite reaching the vibrissw, densely 
clothed with yellowish pile; pilosity of the occiput greyish; on the vertex are some long black bristly 
hairs. Antenne a little shorter than the face; second joint bristly; third joint four or five times as 
long as the second; arista thickened in its proximal half. Proboscis black or dark brown; palpi rufous, 
blackish at the base. Thorax and scutellum cinereous; thoracic dorsum with four black stripes, which, 
behind the transverse suture, become diffuse and disappear in a more general blackish coloration. 
Abdomen elongate-oval, black, somewhat shining; the second and third segments have an almost 
inconspicuous, narrow, whitish front border; macrochete are on the hind margins of these segments, 
and in greater number on the anal segment. Legs rather slender; middle tibie with several long 
bristles ; hind tibiae with shorter and longer bristles; foot-claws and pulvilli elongate in the male, the 
pulvilli yellowish. Tegule whitish. Wings greyish-hyaline; small cross-vein under the middle of the 
mediastinal cell and before the middle of the discal cell; apical cross-vein concave at the base ; posterior 
cross-vein distinctly curved. 
