1913] The North American Species of Tipula. 473 



91. Abdomen with more, or less distinct fuscous stripes, lateral margins of 



segments broadly whitish. Joints of flagellum bicolored. Hypo- 

 pygium large, eighth sternite truncate, the posterior margin with a 

 median broad, rectangular process, lateral angles with a pair of long, 

 rather narrow, flattened appendages; ninth tergite prolonged into two 

 long, blunt processes; ninth sternite nearly concealed by the eight 

 sternite; pleural plates distinct, but pleural suture nearly obliterated 

 above. The white spot before the stigma extends to base of fourth 



posterior cell. Length 21 mm. (d 71 ) calva *Doane 



Abdomen not striped longitudinally, posterior margin of segments 

 yellow. Joints of flagellum approximately unicolorous, brown; poster- 

 ior border of eighth sternite emarginate with two bunches of reddish 

 yellow hair; ninth tergite produced and narrowed posteriorly, posterior 

 margin with crescent-shaped incision, with a median pair of short, 

 black triangular downward projecting teeth; ninth sternite divided 

 by a membranous area, posterior margin with two pairs of small 

 appendages. Wings hyaline, the white antestigmatic band reaches 

 almost to the posterior border. Length 11mm.. flavomarginata Doane 



92. Small cross vein margined with fuscous; flagellum dark brown; abdomen 



with two broad dark brown stripes, lateral and posterior margins 

 of segments grayish; the posterior lateral corners of the ninth tergite 

 drawn out into a short blunt process (9); Wings almost hyaline, 



hypopygium similar to that of albocaudata. Length 19 (9) 



cognata Doane 

 Small cross vein not margined with fuscous. . . 93 



93. A spot over the base of the second submarginal and first posterior cells 



and a spot over the origin of the praefurca brown. Flagellum brown; 

 mesonotum with four darker brown stripes, ninth tergite terminat- 

 ing into two short blunt processes. Wings with a brownish tinge. 



Length 15 mm. (cf ) olympia Doane syn. 



cancinna Doane 

 Without spots over base of second submarginal and first posterior cells 

 and over origin of prefurca. Joints of flagellum unicolorous; mesono- 

 tum with three brown stripes; posterior lateral angles of eight sternite 

 with large appendages; posterior margin of ninth tergite with rounded 

 incision, in the middle of which are two short, sharp points; ninth 

 sternite divided by a deep, broad, U-shaped incision, containing 

 a pair of pendulous appendages; pleural suture complete. Length 

 15mm. {&), 23mm (9) ungulata Doane 



94. Wings with dark costal stripe 95f 



Wings without such a stripe, though costal margin may be a trifle 



darker than the rest of the wing 99 



95. Joints of flagellum bicolorous; costal stripe margined posteriorly by a 



subhyaline stripe. Abdomen dark yellowish, segments with a short, 

 transverse fuscous line behind the anterior margin of segments 

 3-6 and a very small fuscous dot on the sides of all segments; hypopy- 

 gium small, ninth tergite rounded posteriorly, impressed before and 

 slightly notched in the middle of the posterior margin; ninth sternite 

 compressed in its basal half into a carina; pleural suture distinct. 



Length 13-16mm costalis JSay. 



Joints of flagellum not distinctly bicolorous, outer joints at least fuscous. 

 Abdomen with fuscous stripe 96 



96. Costal stripe interrupted before the stigma by an indistinct hyaline 



spot. Length 19mm ( 9 ) cunctans Say. 



Costal stripe not interrupted 97 



*See foot note on valida, under 70. 



fT. clara probably belongs here. See 103. 



% Because costalis being preoccupied in the genus macramaxtix, Mr. C. P. 

 Alexander has changed T. costalis to T. Sayi, a view which I cannot share, hence 

 shall here retain Say's name. 



