222 DIPTERA. 
cell; curvature of the fourth vein angular, in some specimens with a small appendage ; apical cross-vein 
concave ; posterior cross-vein slightly curved. 
Hab. Mexico, Amula 6000 feet, Omilteme 8000 feet, and Sierra de las Aguas Escon- 
didas 9500 feet, all in Guerrero (H. H. Smith). 
Several specimens of both sexes. 
BATHYDEXIA, gen. nov.* 
Front narrowed behind in the male, broad in the female; face perpendicular, scarcely carinated in the middle ; 
oral margin slightly prominent; frontal band with several longitudinal grooves; cheeks bare, moderately 
broad, their lower portion no more than half the longitudinal diameter of the eyes; vibrissal swellings 
nearly parallel ; vibrissee inserted just at the oral margin; eyes bare. Antenne inserted on or below a 
line drawn through the centre of the eyes; third joint elongate, at least three times as long as the second, 
which is very bristly ; arista plumose. Proboscis as long as, or a little longer than, the head ; palpi 
cylindrical. Abdomen broadly ovate, more or less densely beset with macrochete. Legs long and 
slender ; foot-claws and pulvilli elongate in the male. Apical cell opened at some distance before the 
wing's tip; curvature of the fourth vein angular and with a short appendage. 
This genus is nearly allied to Hystrichodexia, but differs from it by the vibrisse 
inserted at the oral margin, the longer antenne, the more angular and shortly appendi- 
culated curvature of the fourth vein, and the less developed facial carina. 
1. Bathydexia appendiculata. 
Phorostoma appendiculata, Bigot, Ann. Soc. Ent. Fr. 1888, p. 269. no. 82 (?). 
Black ; thoracic dorsum somewhat greyish, with indistinct black stripes ; antenne black or brown, the third 
joint three or four times as long as the second. 
Length 15 millim. 
Head whitish-grey ; front of the male narrowed behind, that of the female broader than the eyes; frontal 
band blackish, in the female broader than the lateral portions. Antenne shorter than the face; third 
joint narrow, three or four times as long as the second ; arista brownish-rufous, thickened at the base, 
densely plumose. Proboscis brown, a little longer than the head, with well-developed terminal lips ; 
palpi dark rufous, scarcely thicker towards the tip. Thorax black; thoracic dorsum with some grey 
tomentum and obsolete black stripes; scutellum piceous. Abdomen broadly ovate, convex, piceous, in 
the male densely beset with strong, nearly spinose, macrochete, in the female with long marginal macro- 
cheete. Legs black ; tibia with scattered bristles; foot-claws and pulvilli elongate in the male, the claws 
black, the pulvilli yellowish. Tegule dark brown. Wings brownish; small cross-vein on the middle of 
the discal cell ; apical cross-vein concave ; posterior cross-vein slightly curved. 
Hab. Muxico, Oaxaca (coll. Bigot); Guaremaua, San Gerénimo (Champion). 
Two male specimens from Guatemala; a female from Mexico in the collection of 
‘M. Bigot. The identification of the latter is founded on the examination of atypical 
example, which is by no means a Phorostoma, the hind tibiz not being ciliated. 
* Badds (broad), Dewia. 
