THE CANADIAN ENTOMOLOGIST 65 



brownish, the anterior half most intense. Pleura silvery white, 

 the mesosternum and mesopleura brownish. Halteres dark brown, 

 the knobs and extreme bases of the stems pale. Legs with the 

 ccxse yellow, the posterior coxae dusted with white pollen; femora 

 dull yellow, the tips dark brown; tibiae and tarsi yellowish brown. 

 Wings with the usual hehes pattern but this very heavy. 



Abdomen brownish yellow, the tergites broadly margined with 

 paler, and submargincd with a narrow brown line, palest on the 

 basal segments, on the fourth and succeeding tergites darker and 

 sutTusing the dorsum of the segments; on the five basal tergites 

 with a dark brown, dorso-median line that is interrupted only by 

 the pale, caudal margins of the segments; sternites brownish yellow, 

 margined caudally with silvery, the eighth sternite dark brown, 

 the lateral lobes margined inwardly with a dense brush of long, 

 golden hairs. Male hypopygium with the eighth sternite with 

 the caudal margin deeply incised, tripartite, the lobes fringed as 

 described above. Blade-like process not of the elongate, spiral, 

 horn-like structure of latipennis but flattened, the acute tips 

 curved strongly downwards, the ventral carina obliquely and 

 parallelly grooved or fluted; lower process longer, straight and 

 more pointed, the expanded basal inner portion evenly rounded, 

 suffused with brown, not rectangular or toothed, (as in latipennis) 

 upper process a prominent flatted lobe, rounded apically, the whole 

 lobe intenseh' chitinized, black, not at all hatchet-shaped as in 

 latipennis. In T. hebes the lower process is very massive and 

 with the basal inner portion produced proximad as an acute, 

 chitinized spine; the blade-like processes very narrow toward the 

 tip which is feebly expanded into a spatula; the upper process 

 bifurcate, with two chitinized arms, the outer more pointed, the 

 inner flattened and with the apex rounded. 



Habitat. — Northeastern United States. 



Holotype. — 'd^, Indian Ladder, Helderberg Mts.. Albany Co., 

 N.Y., July 3, 19ia, (Alexander). 



Allotopotype. — 9 . 



Paratopotype. — cf ; paratype. — cf. Wells, Hamilton Co., N.Y., 

 July 31, 1914, (Young); in the N. Y. State Museum. 

 Type in the collection of the author. 



