1913] The North American Species of Tipula. 481 



148. Antennte wholly fuscous; mesonotal vittae margined. Eighth tergite 



scarcely visible except at the sides; eight sternite entire, not emar- 

 ginate; ninth tergite with two short, blunt marginal teeth; ninth 

 sternite with deep V-shaped incision. Wings light fuscous. Length 



10-12 mm dejecta Fab 



fumosg. Doane syn 

 Antennae brown, basal joints yellowish; mesonotum with four brown 

 stripes, not margined. Abdomen brown, basal segments yellowish; 

 eight sternite very large, very slightly emarginate, lateral angles 

 with irregular shaped appendages; ninth tergite large, the lateral 

 angles produced into long, somewhat curved, hornlike processes, 

 which are concave within; posterior margin between these processes 

 with two acute, triangular teeth; ninth sternite divided by a deep, 

 broad membranous depression; pleural plates distinct. Wings hya- 

 line. Length 17 mm. (cf ) tergata Doane 



149. Head and thorax yellow. Joints of flagellum fuscous; mesonotal vittae 



very faint. Abdomen yellow at base brownish posteriorly; eighth ster- 

 nite produced; narrowed posteriorly, with shallow, broad emargina- 

 tion, lateral angles with a pair of conical processes, bearing a pair of 

 long, curved bristles; ninth tergite with deep median furrow, posterior 

 margin with a pair of short, broad, blunt teeth, ninth sternite with 

 deep, shield-shaped incision the sides of which bear a pair of rect- 

 angular plates. Wings hyaline, stigma indistinct, brown; ante-stig- 



mal spot faint. Length 18 mm. (cf ) bifalcata Doane 



Head and thorax not yellow 150 



150. Head and thorax shining black. Antennae wholly black; thorax mar- 



gined with yellow; abdomen shining, sides and posterior margins of 

 segments yellow, eighth sternite not emarginate, hypopygium small, 

 ninth tergite small, short and almost concealed by the reflected, 

 upper appendages; ninth sternite with suture-like incision, the pos- 

 terior margin emarginate. Wings pale brown, ante-stigmal spot 



small but distinct. Length 9-16 mm spernax O. S. 



Head and thorax not shining black 151 



151. Head subfuscous, thorax paler; antennae yellowish-brown, base of flagel- 



lar joints black. Lateral and posterior margin of abdominal seg- 

 ments paler; hypopygium small. Wings pale-brownish, stigma con- 



colorous, ante-stigmal spot not very distinct. Length 13 mm 



umbrosa Loew 

 Head and thorax ferruginous 152 



152. Southern species; legs very long, thorax trivittate; posterior margin of 



abdominal segments paler. Length 16 mm perlongipes Johnson 



filipes Walker syn 

 Northern species; legs not unusually long 153 



153. Posterior margin of abdominal segments paler; base of abdomen not 



paler, the latter with broad dorsal stripe. Length 24 mm. . . triplex Walker 

 Base of abdomen pale, posterior margin of segments not, or indistinctly 

 paler. Length 16-20 mm duplex Walker 



154. Joints of flagellum distinctly bicolorous; yellowish species 155 



Joints of flagellum unicolorous 156 



155. Large form; outer joints of flagellum fuscous; thorax with five stripes. 



Posterior margin of abdominal segments paler. Wings pale tawny, 

 irregularly colorless behind the costal border; veins dark. Length 



16 mm borealis Walker 



Very small; all the joints of the flagellum bicolorous. Mesonotal vittae 

 scarcely recognizable. Posterior margins of abdominal segments 

 slightly infuscate, hypopygium small; ninth tergite relatively large, 

 separated from the side pieces by a distinct suture, posterior margin 

 slightly emarginate; ninth sternite with Y-shaped incision; eighth 

 sternite rounded posteriorly, pleural suture present, straight. 

 Length 6 mm annulicornis Say 



