150 DIPTERA, 
thickened in its proximal third. Proboscis black; palpi dark rufous. Thorax and scutellum cinereous ; 
thoracic dorsum with an ochraceous tint and four nearly linear black stripes, the outer of which are inter- 
rupted at the transverse suture. Abdomen conical; first segment black; second and third segments 
black, with cinereous front borders, which are more or less interrupted in the middle, that of the second 
segment being enlarged laterally; anal segment cinereous, with a black tip; all the segments with 
marginal macrochete, those of the third segment longer; the anal segment with many macrochate and 
black hairs. Legs less slender than in most of the preceding species; posterior tibie with some long 
bristles ; foot-claws and pulvilli elongate, the pulvilli blackish. Tegule whitish. The brownish tint on 
the costa of the wings is most conspicuous between the end of the first and second veins and on the small 
cross-vein ; this cross-vein is on the middle of the discal cell; the curvature of the fourth vein forms a 
blunt angle; apical cross-vein curved near its end; posterior cross-vein distinctly sinuous. 
Hab. Mexico, Amula in Guerrero 6000 feet (H. H. Smith). 
A single male example. 
A female specimen, from Omilteme 8000 feet, Guerrero (H. H. Smith), is perhaps 
the other sex of it. The latter, in addition to the usual sexual differences (a broader 
front, a more ovate abdomen, and short foot-claws and pulvilli), has black palpi, 
narrower grey front borders to the abdominal segments, and a less conspicuous brownish 
tint on the wings, this tint, moreover, not being extended over the small cross-vein, 
DEGEERIA. 
Degeeria, Meigen, System. Beschr. europ. zweifl. Ins. vii. p. 249. no. 37 (1838). 
In this genus—characterized by elongate antenne, bare eyes, bristles on the facial 
ridges, and the apical cell ending in or nearly in the wing’s tip—the following Central- 
American species must be included. Like the European representatives, they are all 
of small size, the largest of them being only about 5 millim. in length. 
1. Insertion of the posterior cross-vein in the fourth vein 
nearer to the curvature of this vein than to the small 
cross-veln . . . . 2... ., oe 2. 2 
Insertion of the posterior cross-vein in the fourth vein 
in the middle or before the middle between the small 
cross-vein and the curvature of the fourth vein . . 5. 
2. Wings blackish on the costa. . . . - . nigrocostalis, v. d. Wulp. 
Wings hyaline (sometimes infuscated at the base) . . 38. 
8. Posterior cross-vein sinuous . . . . . . . . . mitidiuscula, vy. d. Wulp. 
Posterior cross-vein straight . . 2. 2. 6 ee ew ew ds 
4, Base of the wings infuscated . . . . . . . . . basalis, v. d. Wulp. 
Base of the wings not infuscated . . . . . . . hyalinipennis, v. d. Wulp. 
5. Second and third abdominal segments with only mar- 
ginal macrochete . . . oe ew ee es 6, 
Second and third abdominal segments with discal and 
marginal macrochete . . . ° -.. 8& 
6. Frontal band as broad as the lateral portions - + . nigricans, v. d. Wulp. 
Frontal band narrower than the lateral portions . . 7. 
