58 DIPTERA. 
11. Mystacella subcyanea, sp. n., 2 
Black ; head yellow ; thorax greyish, with four black stripes; abdomen bluish, with white reflecting spots ; 
palpi rafous ; apical cross-vein arcuated. 
Length 7 millim. 
Head pale ochraceous ; front slightly prominent, on the vertex nearly as broad as the eyes; frontal band black ; 
frontal bristles distinctly descending beneath the end of the second antennal joint; eyes densely clothed 
with yellowish pile; beard white. Antenne black, shorter than the face; third joint three times as long 
as the second, slightly rufous at the base; arista thickened on the proximal half. Proboscis brown; 
palpi rufous. Thorax and scutellum black, with some grey tomentum ; thoracic dorsum with four distinct 
broad black stripes. Abdomen ovate, bluish-black, the second and third segments with whitish reflecting 
spots and narrow white front borders; besides the marginal macrocheté on the second and third, there 
are two discal ones on the third segment and several on the anal segment. Legs black; middle tibie 
outwardly with some long bristles; hind tibise: outwardly with several longer and shorter bristles. 
Tegule yellowish-grey. Wings greyish-hyaline; small cross-vein on the middle of the discal cell; 
curvation of the fourth vein with an acute angle; apical cross-vein very concave and arcuated over its 
whole length; posterior cross-vein slightly curved. 
Hab. Mexico, Sierra de las Aguas Escondidas, Guerrero, 7000 feet (H. H. Smith). 
A single female specimen. 
12. Mystacella setulosa, sp. n., 9. 
Black ; head and the thorax anteriorly greyish, the latter with black stripes; abdomen with whitish reflections ; 
palpi yellowish-red ; posterior tibiz dark rufous; small cross-vein before the middle of the discal cell. 
Length 6°5 millin. 
Allied to the preceding species, but differing in the following respects :—The head is not yellow, but greyish ; 
the grey tomentum of the thorax is confined to the anterior portion; the black stripes on the thoracic 
dorsum are narrower and less distinct; the abdomen has a bronze instead of a bluish tint ; discal macro- 
cheetee are also on the second segment; the middle and hind tibie are dark rufous; the wings are 
brownish at the base and on the costa; the small cross-vein is somewhat infuscated and distinctly before 
the middle of the discal cell; the apical cross-vein is concave only at the base, and for the rest straight ; 
the bristles of the head, body, and legs are comparatively longer. 
Hab. Muxico, Omilteme in Guerrero 8000 feet (H. H. Smith). 
A single female specimen. 
MEIGENTA. 
Meigenia, Robineau-Desvoidy, Essai sur les Myodaires, p. 198 (1880). 
Spilosia, Rondani, Dipterol. Ital. Prodr. iii. p. 111 (1859). 
This genus agrees with Mystacella and Brachycoma in having the vibrisse inserted 
at some distance above the oral margin. It differs from both by the curvation of the 
fourth vein forming a blunt angle, and by the straight (not concave) apical cross-vein ; 
from Mystacella it may be distinguished, moreover, by the more elongate abdomen, 
this latter being not broadly ovate, but conical. The eyes are pilose, though less 
conspicuously so than in Mystacella; in Brachycoma (some of the species of which 
have also a conical abdomen), on the contrary, the eyes are absolutely bare. 
I must refer three species from Central America to the genus Meigenia. 
