956 Charles Paul Alexander 



T. conspicua Dietz. (Dietz, 1917: 119-150.) 



Tricolor group; close to T. eluta. Grayish white; anteiinal flagelhnn distinctly bicolorous; 

 thoracic stripes nuir^inod with brown, the median stripe divided by a dark line; hyaline 

 vitta of wings reacliing the outer margin; abdomen yellow, unstriped; ninth tergite with 

 lateral pencils of hairs. Wing of male, 17 mm. (North Carohna, September.) 



T. sackeniana Alex. (Alexander, 1918 a: 62-63.) 



Tricolor group; close to T. tricolor. Coloration reddish brown; antennae bicolorous; 

 male hypopygium without a pencil of hairs on either side of median lobe of tergite. Wing 

 of male, 15.5 mm. (New York, Maryland, Virginia, and Georgia, July and September.) 



T. vicina Dietz. (Dietz, 1917:148-149.) 



Tricolor group; close to T. eluta. Grayish brown; antenna! flagellum unicolorous 

 brown; mesonotal stripes margined with brown, the nedian stripe divided by a blackish 

 line; hyaline vitta of wings extending thru cells 1st M- and /?5 to margin; abdomen striped 

 laterally. Wing of male, 13 mm. (Isew York, May; ]\lichigan, July.) 



T. ento77}ophthorae Alex. (Alexander, 1918 c: 385-386.) 



Trivillata group; close to T. angidata. Mesonotal prcscutum gray with three brown 

 stripes; wings gray with a broad white cross band beyond the cord; vein ^2 persistent for its 

 entire length; male hypopygium with the ninth tergite deeply notched medially, the lateral 

 angles obhquely truncated. Wing of male, 15.8 mm. (North Carolina.) 



T. flainbasis Alex. (Alexander, 1918 c:411-412.) 



Valida group. A small, pale brownish species, easilj^ distinguished from all its relatives 

 by the bicolorous antennae, the basal enlargements of the segments being light yellow and 

 the re:/!ainder black. Antennae of male long and slender, if bent backward extending 

 to beyond base of abdomen. In coloration of antennae the species in the faunal limits of this 

 paper is approached only by T. tephrocephala, a very different fly. Wing of male, 12 mm. 

 (Kansas, Jiily.) 



T. huron Alex. (Alexander, 1918 a: 66-67.) 



Valida group; close to T. suhmaculata. Wings with a heavy brown pattern resembling 

 T. trivillata or T. angulata. Wing of male, 15.6 mm. (Wisconsin, June.) 



T. margarita Alex. (Alexander, 1918 b: 243-244.) 



General coloration of head and thora:<' li.^ht gray; antennae short, black, the three basal 

 segments orange-yellow; femora with a broad subterminal yellow ring, most distinct on the 

 fore legs; ivings with four brown crossbands; abdomen yellow, the tergites with a broad 

 dark brown median stripe and narrow sublateral stripes, the lateral margin of the tergites 

 broadly light gray; male hypopygium with the ninth tergite large, subquadrate, with a deep 

 median split, the ninth pleurite complete, the eighth sternite with a large tuft of yellow 

 hairs on either side of the median line. Wing of male, 14.4 nmi. (New York, June.) 



T. fidtonenn.<i Ahx. (Alexander, 1918 a: 67.) ,,,.,,. 



Arctica group- close to T. longiventris. Abdomen of female about one-half mch shorter 

 than in the female of longiventris (16 mm.). Wing of female, 18.5 mm. (New York, June.) 



T. hdderbergensis Alex. (Alexander, 1918 a: 64-65.) ,^ „ 



Hehes group- close to T. latipennis. General color very dark; antennal flagellum uni- 

 formly brown; male hypopygium with the eighth sternite densely frmged with long golden 

 hairs. Wing of male, 14 mm. (New York, July.) 



It will be noted that many names are not included in this key to the 

 genus Tipula, and this is because most of them are synonymous with 

 species that are mcluded. The principal synonymy is as follows: 



