942 Charles Paul Alexander 



others). Wing pattern characteristic, with whitish or hyaHne spots at the ends of the veins 

 at the wing margin; ninth tergite tending to be notched, and often rather massive. 

 T. abdominalis (Say) 



19. The dejecta group. — Ninth tergite with two lobes on the caudal margin, in T. iroquois 

 slender and lying parallel, in T. dejecta more divergent; ninth tergite strongly fused with 

 the sternite in T. dejecta, the condition found in the remaining groups to be considered. 



T. iroquois Alex. 

 T. dejecta Walk. 

 T. aprilina Alex. 



20. The tephrocephala group. — Sclerites of the ninth segment fused into a continuous ring; 

 ninth tergite with two slender parallel lobes on the caudal margin. 



T. tephrocephala Loew 

 T. caijuga Alex. 



21. The tricolor group. — Species with striate wings. This group is divisible into the 

 following two subgroups, which pass readily into each other: 



a. The tricolor subgroup. — Wings with a heavy striate pattern. 



T. saiji Alex. 



T. tricolor Fabr. • 



T. caloptera Loew 



T. bella Loew 



T. fraterna Loew 



T. strepens Loew 



T. eluta Loew 



T. conspicua Dietz 



T. ludoviciana Alex. 



T. sackeniana Alex. 



T. vicina Dietz 



b. The perlongipes subgroup. — Wings subhyaline. 



T. perlongipes Johns. 



T. sulphurea Doane 



T. kennicotti Alex. 

 The tricolor group has the sclerites of the ninth segment fused into a continuous ring; 

 the ninth tergite has a single broad, depressed, median lobe, which in some species is indis- 

 tinctly cut in two by a median split. 



22. The cunctans group. — Sclerites of the ninth segment fused into a continuous ring; 

 ninth tergite with a conspicuous median notch. 



T. cunctans Say 

 T. ultima Alex. 



The local species of the genus Tipula may be separated in accordance 

 with the following key: 



1. Wings with a distinct pubescence in the apical cells 2 



Wings without pubescence in the apical cells. (Subgenus Tipula Linn.) 5 



2. Pubescence of wings abundant, including all the apical cells from Ri to Mt ; coloration 



dull as in species of Oropeza; antennae black, the scape light yellow; thorax brownish 

 gray, the prescutum with three darker brownish gray stripes; basal deflection of 

 Cui and the m-cu cross- vein at or near the fork of M; male hypopygium with each 

 caudo-ventral angle of the ninth sternite prolonged caudad into a pale, slender, 

 finger-like lobe. [Proc. Boston Soc. Nat. Hist., vol. 34, no. 5, p. 131. 1909.] (Plate 

 XLIII, 195, wing; Plate XLIX, 258, ninth tergite; Plate LIII, 330, lateral aspect of 



male hypopygium.) (Subgenus Trichotipula Alex.) T. oropezoides Johns. 



Pubescence of wings less abundant, not extending beyond cells R3, Rb, Mi, and M; and 

 confined to the centers of the cells; coloration usually bright as in Nephrotoma, or 

 else the prescutum dark-colored with pale stripes 3 



