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—d", Mount Vernon, Virginia; Apr. 16, 1916, (W. 

 L. McAtee). 



Paratopotypes. — 2 cfs. 



Types in the collection of the U. S. Biological Survey. 



In 7". 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 



