250 DIPTERA. 
LEPTODA. 
Leptoda, Van der Wulp, Tijdschr. voor Ent. xxviii. p. 196 (1885). 
Body elongate. Front narrowed behind, especially in the male; frontal bristles weak ; face perpendicular, 
not earinated; eyes bare; cheeks broad, their lower portion equalling at least half the longitudinal 
diameter of the eyes; vibrissal swellings parallel ; vibrisse inserted nearly at the oral margin. Antenne 
elongate, inserted beneath a line drawn through the middle of the eyes; third joint three times as long as 
the second ; arista densely plumose. Proboscis short, with well-developed terminal lips ; palpi cylindrical. 
Abdomen conical ; macrochwte only at the hind margins of the segments, sometimes absent on the first 
segments. Legs slender; middle femora longer than the others; foot-claws and pulvilli (at least in 
L. gracilis) elongate in the male. Tegule large. Wings a little longer than the abdomen; apical cell 
opened nearly at the wing’s tip; posterior cross-vein beyond the middle between the small cross-vein 
and the curvature of the fourth vein; this curvature angular, sometimes with a short appendage. 
The type of this genus is Dexia gracilis, Wiedem. It is possible that Deaugia 
angusta, Perty (Del. Anim. Art. Bras. p. 187, t. 37. fig. 9), from Brazil, is a closely 
allied species with partly infuscated wings. The description, both of the genus and 
species, agrees in most respects; but in the figure the apical cross-vein is represented 
as being very close to the hind margin of the wings, a character not present in Leptoda 
gracilis nor in L. semirufa. Moreover, Diaugia is said to be related to Sarcophaga, 
and on this account Macquart (Dipt. Exot. ii. 3, p. 93) includes it among the Sarcopha- 
gine, whilst Leptoda undoubtedly belongs to the Dexine. 
1. Leptoda gracilis. (Tab. VI. figg. 5; 5a, head.) 
Dexia gracilis, Wiedem. Aussereur. zweifl. Ins. 11. p. 373. no. 8. 
Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Sinith); Guaremata, San 
Gerénimo (Champion). 
Three male specimens. 
Wiedemann’s description agrees in all points, and, moreover, the identity is confirmed 
by Prof. Brauer, who has compared a Mexican specimen with the typical example in 
the Museum of Vienna. The third antennal joint is slender, pointed at the tip; the 
arista is black, thickened at the base ; the scutellum is reddish-grey ; the anus is rufous. 
The wings, which are described by Wiedemann as hyaline with brownish veins, are 
in the specimens before me greyish, with a dilute brownish shadow along the veins; 
the curvature of the fourth vein forms a rectangle without appendage ; the apical cross- 
vein is concave; the small cross-vein stands on the middle of the discal cell; the 
posterior cross-vein is distinctly curved. Length 13 millim. — 
Wiedemann was not aware of the habitat of his specimen. 
2. Leptoda semirufa, sp. n. ( 3%). 
Blackish ; antenne, palpi, and abdomen rufous, the latter with a black dorsal band, which is extended along 
the hind border of the third segment ; curvature of the fourth vein appendiculated. 
Length 9°5 millim. 
