356 DIPTERA. 
bristles. Abdomen obscure cinereous ; hind borders of the segments whitish. Front legs black, with 
the knees rufous; middle and hind legs rufous, with the tips of the femora and tibie, and the terminal 
joints of the tarsi, black (in the male specimen the middle and hind legs are brownish). Halteres yellow. 
Wings slightly greyish ; the costal border, from the tip of the first to the end of the second vein, brownish, 
but not so dark as in S. nana; the cross-veins are clouded with blackish, and there are blackish spots, 
mostly in the shape of transverse stripes, between the veins—five or six in the submarginal cell, three in 
the first posterior cell, and three in the discal cell; a small stump of a vein, likewise clouded, on the 
terminal section of the fourth vein ; small cross-vein under the end of the first vein and on the middle of 
the discal cell ; posterior cross-vein slightly convex. 
Hab. Mexico, Vera Cruz and Mexico city (H. H. Smith). 
One male and two female specimens. This species is closely allied to S. nana, 
but distinguished from it by the different markings of the wings. 
4, Sciomyza squalens, sp.n., ¢ 2. (Tab. IX. fig. 10, head in profile.) 
Cinereous; front borders of the abdominal segments blackish; front, antenne, and legs rufous; cross-veins 
infuscated ; arista nearly bare. 
Length 4-5-5 millim. 
Front rufous; a brown spot between the antenne and the orbits; face and cheeks white or yellowish. 
Antenne brownish-rufous ; arista black, with very minute hairs. Proboscis and palpi rufous. Thorax, 
scutellum, and abdomen cinereous; thoracic dorsum with more or less distinct. brown lines; pleure 
clearer, sometimes with a slight rufous tinge ; no dark stripe between the shoulders and the base of the 
wings; fore coxe yellowish, middle and hind coxe grey; scutellum with four bristles. Front borders of 
the abdominal segments blackish or with three blackish spots; anal segment and genitalia of the male 
brownish-rufous. Legs rufous; the first pair usually with the femora (except the base and tip) and the 
tibia obscure; hind femora with a black spot before the tip; tips of the middle and hind tibie, and the 
terminal joints of the tarsi, blackish ; basal joint of the front tarsi whitish. Halteres pale yellow. Wings 
greyish-hyaline ; small cross-vein under the end of the first vein and on the middle or a little beyond 
the middle of the discal cell; posterior cross-vein straight, somewhat perpendicular; both cross-veins 
infuscated. 
Hab. Mexico, Mexico city (H. H. Smith). 
Seven males and three females. 
5. Sciomyza serena, sp.n., ¢ 2. 
Cinereous ; front rufous, with three polished stripes; antennz and legs brownish ; cross-veins not infuscated ; 
arista bare. — 
Length 4—4°5 millim. 
Front rufous, with three polished stripes, the intermediate one brown; face and cheeks whitish. The two basal 
joints of the antenne and the base of the third joint also rufous, the greater part of the latter blackish- 
brown ; arista black, bare. Proboscis rufous; palpi yellow. Thorax, scutellum, and abdomen cinereous ; 
thoracic dorsum with indistinct brown lines, the pleure clearer; front coxe yellowish-rufous; scutellum 
with four bristles; front borders of the abdominal segments somewhat obscure. Legs uniform brownish- 
rufous, the tibie and tarsi of the front pair sometimes black. Halteres yellowish. Wings greyish- 
hyaline, iridescent; the cross-veins neither thickened nor infuscated ; small cross-vein under the end of 
the first vein and on the middle of the discal cell; posterior cross-vein perpendicular and straight. 
ITab. Mexico, Vera Cruz and Mexico city (H. H. Smith). 
Two males and one female. 
