EXORISTA. 71 
reflections ; anal segment shining black, with the front margin laterally whitish ; macrocheete are on the 
hind margins of the segments; ventral face blackish. Middle tibiee with some long bristles; hind tibia 
outwardly with bristles of unequal length; foot-claws and pulvilli elongate, the pulvilli yellow. ‘Tegule 
whitish. Wings with a brownish-yellow tint; small cross-vein on the middle of the discal cell; apical 
and posterior cross-veins nearly straight. 
Hab. Mexico, Chilpancingo in Guerrero 4600 feet (H. H. Smith). 
A single male specimen. 
Three female examples from Amula, Guerrero, 6000 feet (H. H. Sinith), seem to 
belong to this species. They agree with the above description of the male, but have 
a less elongate form (their length is but 8 millim.); the coloration of the body is more 
cinereous; the front is more yellowish and as broad as the eyes; the antenne are 
broader, and their third joint not more than four times as long as the second ; the foot- 
claws and pulvilli short; and the wings more hyaline. 
20. Exorista exilis, sp. n., ¢ 
Shining black; head whitish; thorax with some whitish tomentum and obsolete stripes; abdomen conical, 
the second and third segments with whitish front borders. 
Length 6°5 millim. 
Elongate. Front scarcely narrowed behind, nearly as broad as the eyes; frontal band black; frontal bristles 
on both sides ina single row, descending to beneath the end of the second antennal joint; cheeks narrow ; 
beard white. Antenne black, nearly as long as the face; second joint short, bristly; third joint six 
times as long as the second; arista thickened in its basal third. Proboscis black ; palpi dark rufous. 
Thorax and seutellum shining black; thoracic dorsum anteriorly with a whitish tomentum, in which 
four black stripes sometimes appear; laterally a similar tomentum forms a whitish band between the 
shoulders and the root of the wings; the pleure show some whitish reflections. Abdomen conical, longer 
than the thorax, shining black; the second and third segments with whitish front borders, which are 
broadly interrupted in the middle ; anal segment very shining and without any white reflection; macro- 
chest are on the hind margins of the segments. Legs black; middle and hind tibis with some rather 
long bristles; foot-claws and pulvilli elongate. Tegule whitish. Wings greyish-hyaline; small cross- 
vein before the middle of, the discal cell; apical and posterior cross-veins very slightly curved, nearly 
straight, 
Hab. Mexico, Amula in Guerrero 6000 feet (H. H. Smith). 
Two male specimens. 
21. Exorista ignobilis, sp.n., 3. 
Blackish ; thoracic dorsum anteriorly greyish with obsolete stripes; abdomen ovate, with whitish reflecting 
spots, the second segment laterally testaceous. 
Length 7 millim. 
Head blackish ; front narrowed behind; frontal band black; frontal bristles short, descending in a double 
row, or somewhat irregularly, beneath the root of the antenne; cheeks narrow, with whitish reflections. 
Antenne black, shorter than the face; second joint short; third joint four times as long as the second ; 
arista thickened in its proximal half. Proboscis and palpi black, the palpi cylindrical, densely clothed 
with short hairs. Thorax and scutellum shining black ; thoracic dorsum anteriorly with grey tomentum 
and the commencement of four black stripes; on the pleuree a whitish band extending from the shoulders 
to the middle cox. Abdomen broadly ovate, blackish, with grey and whitish reflecting spots (sometimes 
with a black dorsal stripe and black hind borders to the segments), and densely beset with black hairs ; 
the second segment is laterally testaceous (on the ventral side this colour is also extended over the third 
