64 THE CANADIAN ENTOMOLOGIST 
Male. — Length 11-11.2 mm.; wing 11.5 mm. 
Region of the ninth tergite large, the caudal margin with the 
lateral angles produced caudad into prominent, blunt lobes that 
are blackened and furnished with small tubercles, the caudal 
margin truncated; between the lateral lobes two parallel, usually 
longer and slightly pointed lobes that are directed slightly ventrad, 
one situated on either side of the median line; outer pleural ap- 
pendage very small, inconspicuous, elongate-cylindrical, yellowish; 
inner pleural appendage elongate, narrow; margins of the ninth 
sternite not widely separated beneath, carinated with a narrow, 
V-shaped caudal notch; at the point of the notch a pair of small, 
elongate, fleshy lobes. 
Habitat. — Eastern United States. 
Holotype — cT, Mount Vernon, Virginia; Apr. 16, 1916, (W. 
L. McAtee). 
Paratopotypes. — 2 cTs. 
Types in the collection of the U. S. Biological Survey. 
\n T. dejecta Walker, the caudal margin of the ninth tergite 
bears a broad median lobe that has its posterior portion produced 
into two flattened, divergent horns; outer pleural appendage 
prominent, elongate, curved; inner pleural appendage short and 
broad, the ninth sternite with a broad V-shaped notch. 
Tipula helderbergensis, sp. n. 
Hebes group; related to latipennis Loew.; general colour very 
dark; antennal flagellum uniformly brown; male hypopygium with 
the eighth sternite with a dense fringe of long, golden hairs. 
Male. — Length 12-13 mm.; wing 13.8-14 mm. 
Female. — Length 14.5 mm.; wing 14.4 mm. 
Antennae elongated, the flagellar segments dark brown 
throughout. Vertex behind dark gray with a diffuse, blackish 
median stripe. 
Prsescutum light gray with three darker gray stripes, the 
lateral stripes margined inwardly and anteriorly with darker; 
median stripe broadest, margined laterally with darker, the an- 
terior portion likewise darker, somewhat blackish; scutum grayish, 
more brown medially, each lobe with two dark confluent blotches; 
scutellum brownish yellow, a little darker medially; postnotum 
