336 A. L. MELANDER. 



or in part black, that of abdomen dirty white. Apically the hind tibiae slightly 

 incrassate. Halteres whitish. Wings pale fuscous, stigma saturate fuscous. 

 2.2 mm. 



District of Columbia (Osten Sacken), Wisconsin (Wheeler). 



Cyrtonia longipes Loew (Fig. 71). 

 Cent, ii, 47. 



Wholly black, shining. Pile of the thorax and of the scutellum black. Pile 

 of abdomen above black, along sides and beneath pale ; abdomen of male above 

 opaque. Legs longer and more slender than usual, moderately pilose, hind tibiae 

 somewhat thickened apically. Halteres dark brown. Wings blackish. 2.6 mm. 



Massachusetts, New Hampshire, Wisconsin, Illinois, Wyoming, 

 New Mexico. 



Cyrtonia pilipes Loew. 

 Cent, ii, 48. 



Black, shining. The pile of the thorax and scutellum, and partly that of the 

 abdomen black. Legs rather strong and closely black -pilose, hind tibise a little 

 thickened, especially apically. Halteres black ; wings blackish. 3 mm. 



Illinois (Le Baron j, Alaska (Kincaid). 



MYTHICOMYIN^. 



HIL.AR01VI0RFHA Schiner. 



Although Hilaromorpha has been assigned to the Leptidse by 

 most writers, it is included in the present paper mainly because in 

 the tables of the only complete Manual of the North American 

 Diptera, that of Dr. Williston, specimens of the genus would run 

 to the Empididse, and not because it is any firm belief of the writer 

 that Hilardmorpha can be an Empid, and only an Empid. 



Small, bare species of blackish gray color. Antennae three- 

 jointed, the first two joints short, the third lengthened, broad, 

 toward the end suddenly narrowed, with a short two-jointed bristle. 

 Proboscis short, projecting slightly ; labellse broad ; palpi two- 

 jointed, strongly thickened at the end, lamellate, as long as the pro- 

 boscis. Eyes of the male contiguous on the front, of the female 

 separated by the front. Three ocelli. Thorax strongly arched ; 

 abdomen arched posteriorly, transversely wrinkled, in both sexes 

 pointed, in the males the projecting genitalia are attached to the 

 small end of the abdomen ; these consist of broad claw-like side 

 pieces, which are brought together to form a thick, globose body. 

 Legs slender, the hind ones somewhat lengthened. The third and 

 fourth veins of the wing forked ; discal cell wanting ; anal cell 

 broad up to the wing- margin, closed. Anal angle well-developed. 



