126 DIPTERA. 
yellowish-rufous, the first and second segments each with a blackish or dark cinereous dorsal spot, the 
third segment with a broad cinereous hind border, and the anal segment entirely cinereous—( 9 ) elliptical, 
the second and third segments cinereous, with narrow rufous front borders; first segment with two lateral 
macrocheete, one on each side; second segment with four macrochete, two dorsal and two lateral; third 
and fourth segments each also with four macrochete. Legs, including the coxe, rufous, and with some 
scattered bristles; hind femora infuscated towards the tip; tarsi black. Tegule yellowish-white. Wings 
greyish-hyaline ; small cross-vein before the middle of the discal cell; curvation of the fourth vein rounded ; 
apical cell ending in the wing’s tip, very narrowly opened or nearly closed ; posterior cross-vein subperpen- — 
dicular, in the middle between the small cross-vein and the curvation of the fourth vein. In the female 
specimens a small costal spine is present. 
Hab. Mexico, Orizaba (F. D. G. & H. H. Smith), Xucumanatlan 7000 feet and 
Omilteme 8000 feet in Guerrero, Cuernavaca, Mexico city (H. H. Smith). 
Several specimens of both sexes. 
2. Siphona diluta, sp.n.,¢ ¢. 
Thorax cinereous, anteriorly with blackish stripes; abdomen rufous, with cinereous or blackish markings; 
frontal band and antenne (except sometimes the basal joints) black; legs rufous, partly infuscated ; 
wings brownish. 
Length 3—4 millim. 
Front cinereous, broader than the eyes; frontal bristles inserted on black warts; face and occiput grey or 
whitish; no bristles above the vibrisse. Antenne black, the basal joints rufous in the female; third 
joint rather broad, three (9) or four (g) times as long as the second; arista thickened to near the tip, 
the penultimate joint shorter than the terminal one. Proboscis blackish ; palpi rufous, sometimes black 
at the tip in the male. Thorax and scutellum cinereous; thoracic dorsum anteriorly clearer and with 
four dark lines. Abdomen—( ¢ ) elliptical, yellowish-rufous, the first and second segments with a blackish 
~ dorsal stripe, which is laterally extended on the hind margin of the second segment, the third and anal 
segments blackish, with yellow front borders—( @ ) ovate, dark cinereous, with yellowish front borders to 
the segments; macrochete as in the preceding species, but absent on the first segment. Legs, including 
the coxe, rufous, with several weak bristles; all the femora infuscated towards the tip; hind tibie 
brownish at the base and near the tip; tarsi black. Tegule yellowish. Wings dilute brown; small 
cross-vein on the middle of the discal cell; curvation of the fourth vein rounded; apical cell very 
narrowly opened at the wing’s tip; posterior cross-vein perpendicular, in the middle between the small 
Pa . 
\ 
cross-vein and the curvation of the fourth vein ; no costal spine. [Vemaanener § 4 pe 
\ 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith). 
Four male and five female specimens. 
8. Siphona 2 
This species, represented by one example of each sex, has (like the preceding two) the general facies of the 
European Siphone ; but seems to differ from them in the shorter proboscis (perhaps a part of it is broken 
off), The antenne are wholly rufous; the third joint is rather broad; the arista jointed, but not nicked. 
The thorax is cinereous, without stripes. The second and following abdominal segments have white front 
borders, which are especially distinct in the female, as in that sex these segments are for the rest black. 
Length 2°5 millim. 
Hab. Mexico, Amula in Guerrero 6000 feet, Teapa in Tabasco (H. H. Smith). 
A female specimen from the former, a male from the latter locality. 
