1913] The North American Species of Tipula. 465 



24. Wings marked with pale and fuscous spots, or the latter only 25* 



Wings marked with pale spots only 65 



25. A spot at base of basal cells 26 



Without such a spot 34 



26. Thoracic vittae margined with fuscous 27 



Thoracic vittas not margined 33 



27. Joints of flagellum bicolorous; abdomen of female very much elongated. 



Abdomen with lateral stripes; hypopygium small, ninth tergite short, 

 rather broadly emarginate, ninth sternite more narrowly emarginate. 



Length 15^ mm - ( cf ) . 19-20 mm. (9) langiventris Loew 



Joints of flagellum unicolorous 28 



28. Color cinereous 29 



Color brown 32 



29. Entire wing with dark fuscous and white spots 30 



Not so marked 31 



30. Fourth posterior cell almost entirely white; ovipositor serrulate ben- 



neath; abdominal stripes indistinct. Length 23-24 mm tesselata Loew 



First and fourth posterior cells white at base only. Abdomen with 

 fuscous dorsal vitta and lateral lines; hypopygium small; ninth tergite 

 small. Length 17 mm septentrionalis Loew 



31. Basal joints of antennae yellowish-brown; abdomen yellowish with three 



brown stripes; wing veins, except in basal portion margined with 



fuscous. Length 30 mm. ( 9 ) leucophcea Doane 



Basal joints of antennas grayish-fuscous; abdomen yellowish fuscous, 

 stripes indistinct; hypopygium rather large, ninth tergite rather 

 broadly emarginate posteriorly, the emargination with a small exci- 

 sion in the centre; ninth sternite with large V-shaped incision. Length 

 15-17 mm truncorum Meigen 



32. Thoracic vittae very wide; pleura with indistinct, brown spots. Pleural 



suture of hypopygium present, though indistinct. Posterior margin 

 of ninth tergite yellowish, with two black, triangular, downward pro- 

 jecting processes on its under surface; posterior margin of ninth ster- 

 nite with deep, rectangular incision. Whitish spots in all the cells. 



Length 20-33 mm pacifica Doane 



Mesonotum with six brown stripes; pleura gray with an oblique, brown 



stripe. Hypopygium without pleural suture or pleural plates; ninth 



sternite deeply and broadly emarginate. Length 20mm. (cf)..-. 



subcinerea Doane 



33. Larger. Length over 20mm, testaceous retorta V. d. Wulp 



Smaller, not exceeding 16 mm. Grayish black; posterior margins of ab- 

 dominal segments yellowish. Hypopygium large, blackish, append- 

 ages yellowish. Wings grayish-fuscous, base of first and fourth pos- 

 terior cells, whitish. Length 11 mm. (cf ) ternaria Loew 



34. Thoracic vittae margined 35 



Thoracic vittae not margined 52 



35. Joints of flagellum unicolorous 36 



Joints of flagellum bicolorous 47 



36. A fuscous spot at end of longitudinal veins |37 



Wings not so marked 39 



37. Larger, length 16 mm. and over 38 



Smaller, length 10 mm.' (cf). Brown ; ninth tergite with a broad crescent 



shaped emargination. Ninth sternite with a very deep V-shaped inci- 

 sion. Neither pleural suture or pleural plates present. Basal half 

 of fifth vein broadly bordered with fuscous anteriorly. Length 10 

 mm. (cf ) .' simplex {Doane 



*olympia, see under 93. unicincta, see under 138. Simulata pratorum, see 

 Appendix. 



tpubera Loew., see 57; rupicola, see 50, and abluta, see 58, belong here. 



{The female has rudimentary wings and should have been placed under 165 — 

 species with rudimentary wings in the female — . 



