MICROPEZA.—CALOBATA. 367 
Head brownish-rufous; front narrow, anteriorly with two black spots, which on the outside have a silvery- 
white reflection ; face and cheeks yellow, laterally silvery-white ; occiput moderately projecting, greyish, 
on each side of the ocellar tubercle a white spot; postvertical bristles arising from black points. Antenne 
rufous ; third joint rounded; arista pale. Thorax cinereous; on the dorsal surface are three brown lines 
close to each other and not reaching the anterior border; on each side of them several other lines and 
spots, forming a regular brown pattern; pleure grey, with numerous brown dots; scutellum brown, its 
hind border and the metanotum grey. Abdomen of the male variable in colour: sometimes testaceous 
or rufous, with yellow hind margins to the segments, or nearly black with whitish margins; the anal 
segment and a projection under the penultimate segment pale rufous. Abdomen of the female black, 
with white hind-borders to the segments; ovipositor rufo-testaceous, its apical joint shining black. 
Legs yellowish-rufous ; two rings on the apical half of the femora, the tips of the tibie, and the tarsi, 
black. Halteres brown. Wings hyaline ; first posterior cell closed and more or less petiolated at the 
tip of the wing; the fifth vein often less conspicuous beyond the posterior cross-vein. 
Hab. Mexico, Northern Sonora (Morrison), San Blas in Jalisco, Atoyac in Vera 
Cruz (Schumann), San Lorenzo, Cordova (M. Trujillo), Medellin in Vera Cruz and 
Dos Arroyos in Guerrero (ZH. H. Sinith). 
Several specimens of both sexes. 
| CALOBATA. 
Calobata, Meigen, Illig. Magaz. i1. p. 276 (1803). 
This genus includes numerous exotic species, chiefly American, very interesting on 
account of their form and coloration, and the markings of their wings. Several 
dipterologists have attempted to divide Calobata into smaller genera, but most of these 
subdivisions are not sufficiently well characterized. I prefer, therefore, to adopt here 
the genus in its widest sense, excluding only the genus Cardzacephala, Macq., the 
separation of which seems to be fully justified. 
The Mexican collections before me contain representatives of sixteen species of 
Calobata. 
1. Terminal section of the fourth vein (from the posterior cross-vein to 
the tip of the wing) more than twice as long as the distance 
between the end of the second and that of the third vem . . . 2. 
Terminal section of the fourth vein as long as the distance between 
the end of the second and that of the third vein, or a little longer, 
but never double its length. . . . . . . . 5. 
2. Auxiliary and first veins close together over their whole length and 
ending in the costa before the small cross-vein: rufous species . rubella, v.d. Wulp. 
Auxiliary and first veins widely separated at their points of issue in 
the costa, the first vein reaching to beyond the small cross-vein : 
black species, mostly with uniform blackish wings . . . . . 3. 
3. Legs, including the tarsi, black . . . . - . +. + . + « erythrocephala, Fabr. 
Legs black, with some of the tarsi white . . . 2. 4 
4, Basal joint of the fore and hind tarsi white; wings blackish . . .  diversa, Schin. 
Basal joint of the fore tarsi only white ; wings with brown cross- 
bands . 2 ew we ee ee we ee ee manifesta, v. d. Walp. 
