470 PROCEEDINGS OF THE ACADEMY OF [Sept., 



Wings pale gray, the costal cell only a little more yellowish in color; 

 a pale vitreous mark before the stigma, most distinct in the base of 

 cell 1st Ri, reappearing at the base of cell 1st M^; a white vitreous 

 blotch beyond the stigma occupying the outer end of cell 2nd Ri 

 and the base of R^; stigma prominent, full, oval, dark brown; veins 

 bro^vTi. Venation (see Plate XVI, fig. 2): Rs rather short, arcuated; 

 cell 1st M-2 elongate, narrow; a few hairs in the outer cells of the 

 wing, in cells 1st Ri, Ri, Rs, Rb, Mi and M2. 



Abdominal tergites light yellow, segment two with a broad cross- 

 band at about midlength; segments two to eight with a broad apical 

 cross-band, giving the abdomen a banded tigrine appearance; on 

 the shortened apical segments the banding occupies almost the 

 entire sclerite; sternites one to four pale yellow, five to eight dark 

 brown. Hypopygium with the eighth tergite large, the caudal 

 margin almost straight. Ninth tergite (see Plate XIX, fig. 44) 

 large, the caudal margin with a deep U-shaped notch, the margin 

 provided with rather numerous hairs. Ninth pleurite extensive 

 but incomplete, the pleural suture short, curved dorsad at its tip; 

 pleural appendages (see Plate XX, fig. 61) two, an outer fleshy lobe, 

 moderately long, provided with numerous hairs; inner lobe more 

 complex, consisting of a flattened blade directed dorsad, at the 

 base on the outer edge with a sharp chitinized tooth. Ninth sternite 

 (see Plate XVII, fig. 24) rather restricted, along the ventral median 

 line profoundly incised. Eighth sternite extensive, the caudal 

 margin with a deep and broad U-shaped notch. 



Habitat. — Northeastern North America. 



Holotype, cf. Station Isle, Go-Home Bay, Muskoka District, 

 Ontario, Canada, August 16, 1912 (Clemens). 



Allotype, 9 , Northeast Harbor, Hancock Co., Me., August 29, 

 1908 (Minot). 



Paratypes, No. 1, cT, with the allotype; No. 2, 9, North Mt., 

 Luzerne Co., Pa., August 28, 1897 (Johnson); No. 3, d', Ridgewood, 

 Bergen Co., N. J., July 14, 1911 (Leonard); No. 4, 3 d^, 2 9 near 

 Plummer's Island, Fairfax Co., Virginia, July 28, 1912 (Knab); No. 

 9, Plummer's Island, Maryland, August 4, 1907 (McAfee). 



The type is in the collection of the University of Toronto; the 

 allotype in the collection of the Boston Society of Natural History; 

 paratypes 1, 3, 7 and 8 in the collection of the author; paratype 2 in 

 the collection of Mr. Johnson; Nos. 4-6, in the United States Na- 

 tional Museum; No. 9 in the collection of the Biological Survey. 



The specific name of this interesting fly is that of the great Indian 



