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DIPTERA. 437 
Hab. Mexico1, Xucumanatlan and Omilteme in Guerrero (H. H. Smith), Mexico 
city (Schumann), N. Yucatan (Gaumer). 
Several specimens of both sexes. In the collection of Prof. Bellardi, in Turin, I 
have seen female specimens from Orizaba, Mexico, which are of a larger size (length 
$°9 millim.). 
8. Trichopoda pilipes. 
Thereva pilipes, Fabr. Syst. Antl. p. 220°. 
Trichopoda pilipes, Wiedem. Aussereur. zweifl. Ins. ii. p. 2727; Perty, Del. Anim. Art. Bras. p. 186, 
t. 87. fig. 5°. 
Length 6°5-10 millim. 
Front narrower than the eyes; frontal band velvety-black; face, cheeks, and lateral borders of the front 
silvery-white ; the frontal band emits on both sides a shining black stripe, which descends to beneath the 
vibrisse, the basal part of the stripe being broad and the rest linear. Antenne black; the basal joints 
short ; third joint in the male elliptical, three times as long as the second, in the female oval, twice as 
long as the second. Palpi rufous, infuscate towards the tip. Thorax deep black; thoracic dorsum before 
the transverse suture golden-yellow, with three black bands in the form of quadrangular spots; in some 
specimens the median band is divided into two portions, and in that case the bands appear as four black 
stripes; pleuree with white reflections; scutellum black. Abdomen rufous, the last two segments black; 
the black colour on the dorsal side extending up to the hind-border of the second segment. Legs black ° 
base of the femora rufous ; foot-claws yellow, with black tips; pulvilli whitish. Tegule yellow, whitish 
at the base. Wings black, with the hind-border and the tip greyish-hyaline ; the black colour ends at 
or a little before the apical and posterior cross-veins. 
Hab. Mexico, Acapulco, Rincon, Chilpancingo, Amula, and Xucumanatlan in 
Guerrero, Cuernavaca in Morelos, Atoyac in Vera Cruz (H. H. Smith), Santiago 
Ixcuintla in Jalisco (Schumann).—Sovutu America !-8, 
Several specimens of both sexes. I have no doubt that they belong to 7. pilipes 
(Fabr.), Wiedem., of which the descriptions are fully applicable; the South-American 
insect, however, is described by Wiedemann as having the apex of the scutellum 
ochraceous, whereas it is black in the Mexican specimens. 
[N.B.—Mr. Townsend [Ann. & Mag. Nat. Hist. (6) xix. p. 29, and xx. pp. 272-283 
(1897)]| has described several new species and varieties of this genus, as well as adding 
various known forms, from the Rio Nautla, Vera Cruz.—Eb. | 
HOMOGENIA * (to follow the genus Trichopoda, p. 3). 
Homogenia, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 184 (1892). 
In this genus I include all the species of Zrichopoda which have the apical cell of 
the wings open. In addition to this character, the black fringe on the outer side of the 
hind tibiz is shorter and less conspicuous, more in the form of a row of closely-placed 
* guoyerijs (relation). 
BIOL. CENTR.-AMER., Dipt., Vol. II., May 1903. 37 
