124 DIPTERA OF NORTH AMERICA. [PART IV. 



of the subcostal cross-vein is also unusual. The incrassation of 

 the costa beyond the junction of the auxiliary vein is likewise 

 observable in Orimarga, Toxorrhina, and Antocha. There is 

 perhaps a certain relationship between Elliptera and Orimarga; 

 but the latter has distinct empodia, which the former, according 

 to all accounts, has not. On the other hand, the course of the 

 second vein, the shape of the wing, and the absence of empodia 

 somewhat remind us of Antocha. 



Elliptera (from ij&swtw, I omit, perhaps on account of this 

 genus having been overlooked so long) has been first introduced 

 by Dr. Schiner, in 1863 (Wiener Entomol. Monatschr. Yol. Til, 

 p. 222, and also Fauna Austr. Diptera, II, p. 559). 



Gen. XII. ANTOCHA. 



One submarginal cell ; four posterior cells ; a discal cell ; auxiliary vein 

 indistinct, being closely applied to the first longitudinal vein; the latter con- 

 vergent towards the costa and finally coalescent with it ; the second longi- 

 tudinal vein, at its origin, forms an acute angle with the first longitudinal; 

 anal angle almost square (Tab. I, fig. 11). Wings with a milky tinge. 

 Antennae 16-jointed, rather short. Tibiae without spurs at the tip. Em- 

 podia indistinct. Ungues with small teeth on the under side, at the basis. 

 Forceps of the male with comparatively small claw-shaped horny append- 

 ages (Tab. Ill, fig. 10, forceps oi A. saxicola, from above). 



Rostrum cylindrical, somewhat projecting; palpi slender, rather 

 prolonged, although shorter than the head ; first joint elongated, 

 second and third shorter ; last joint somewhat elongated. The 

 antennae, if bent backwards, would not reach the root of the 

 wings ; basal joint short ; joints of the flagellum subglobular, 

 last joint more elongated ; the flagellum is beset with short hairs 

 and, on the under side, with a delicate pubescence ; no distinct 

 verticils. Eyes glabrous, almost contiguous on the under side 

 of the head ; front narrow. Collare but moderately developed ; 

 thoracic suture deep. Knobs of the halteres rather large. Feet 

 comparatively short, moderately stout ; tibioe without spurs at the 

 tip; empodia indistinct ; the ungues have small teeth on the under 

 side, near the basis, like those of Dicranomyia ; the last tarsal 

 joint of the male is excised on the under side in the interval 

 between it and the preceding joint. The comparatively broad 

 wings are distinguished by the shape of their anal angle, which 

 is that of a rectangle with a rounded point; the course'of the 



