EXORISTA. 73 
24, Exorista glabricula, sp. n., ¢. 
Black ; head whitish; thorax greyish, with black stripes; scutellum and sides of the abdomen testaceous ; 
_ palpi rufous ; small cross-vein on the middle of the discal cell. 
Length 9-10°5 millim. 
Allied to the preceding species (E. maura), and perhaps the other sex of it, but differing in the scutellum being 
testaceous and in the small cross-vein being oblique and resting on the middle of the discal cell. Front 
much narrowed behind; frontal band black, elongate-trigonal, broader than the lateral portions, which are 
cinereous ; frontal bristles short, on both sides descending in a single row to the end of the second antennal 
joint; face and cheeks whitish; eyes densely clothed with yellowish pile ; beard white; pilosity of the 
occiput grey. Antenne black, shorter than the face ; second joint bristly ; third joint three times as long 
as the second; arista thickened to beyond the middle. Proboscis black, the terminal lips sometimes dark 
rufous ; palpi exserted, rufous. Thorax black, with some grey tomentum, which before the transverse 
suture is more conspicuous and interrupted by five black stripes of nearly equal breadth; scutellum piceous 
or testaceous. Abdomen broadly ovate, densely beset with short black hairs; first segment unicolorous 
black; second and third segments black, laterally testaceous, with grey reflections on the front 
borders ; anal segment black, with more or less greyish reflections; on the first two segments the macro- 
cheetee are absent ; on the hind margin of the third segment is a row of macrochete ; on the anal segment 
the hairs are longer and mixed with some macrochete. Legs black; middle tibie with some long bristles ; 
hind tibie outwardly fringed with bristles; foot-claws and pulvilli elongate and surrounded by black 
bristles; the pulvilli yellowish. Tegule yellowish-grey, with a pale yellow margin. Wings greyish- 
hyaline ; apical cross-vein concave at the base; posterior cross-vein slightly curved. 
Hab. Mexico, Amula 6000 feet, Sierra de las Aguas Escondidas 7000 feet, Omilteme 
8000 feet, all in Guerrero (H. H. Smith). 
Four male specimens. 
25. Exorista tenuipalpis, sp.n., ¢. 
Blackish ; head and thorax cinereous; the thorax with black stripes; scutellum and sides of the abdomen 
testaceous; abdomen with grey reflections; palpi rufous, filiform. 
Length 8 millim. 
Front narrowed behind; frontal band black, as broad as the lateral portions, its posterior end bifid; frontal 
bristles short and weak, on both sides descending in a single row to the end of the second antennal joint ; 
above the vibrissee a row of shorter bristles on the facial ridges, mounting to nearly half of the face ; eyes 
densely clothed with whitish pile; beard white. Antenne black, shorter than the face; third joint three or 
four times as long as the second ; arista slightly thickened in its proximal half. Proboscis black, the terminal 
lips with yellowish hairs; palpi filiform, rufous, infuscated at the base. Thorax black, with a cinereous 
tomentum, which is more conspicuous before the transverse suture, where it is interrupted by five black 
stripes (of these the median and the two lateral stripes are the broadest *); scutellum testaceous. Abdomen 
ovate, blackish, the first and second segments laterally testaceous, the second and following segments with 
grey reflecting spots; sometimes the intermediate segments have a black dorsal stripe and on either side 
of that stripe two large black spots on the hind margins ; on the hind margin of the third segment is a 
row of macrochete ; on the anal segment some shorter macrochete among the long black hairs. Legs 
* The disposition of these stripes resembles that of E. interstincta, E. trttata, and £. nigricauda, but the 
stripes are less distinct. It is possible that H. tenuipalpis is the other sex of E. interstincta; it agrees 
with that species in the testaceous colour of the scutellum. But the latter has, besides its smaller size, a 
quite different aspect owing to the more cinereous ground-colour of the thorax and abdomen, on which the 
stripes and spots appear more sharply limited, the palpi thicker, and the small cross-vein before the middle of 
the discal cell. 
BIOL. CENTR.-AMER., Dipt., Vol. II., February 1890. l 
