FAMILY TIPULID.E — THE CRANE FLIES 37 



8. Antennal flag-ellum of male branched, of female branched or serrate; 



legs relatively short and stout. (Ctenophoraria) 9 



Antennal flagellum simple (serrate in Prionocera, readily told by lack 

 of antennal verticils); legs usually more slender. (Tipularia) 11 



9. Antenna of both sexes with two short branches at extreme base of 



flagellar segments two to seven inclusive; tropical. 



Ozodicera: Dihexaclonus Enderlein 

 Antennae of male with three or four branches on each of flagellar 

 segments two to nine, of female merely serrate; north temperate. . 10 



10. Antennas of male with three pectinations on flagellar segments two 



to nine, each segment with a single branch on apical half, in 

 addition to the usual basal pair; ovipositor greatly elongated, 



sabre-like Tanyptera Latreille 



Antennae of male with two pairs of pectinations on flagellar segments 

 two to nine, one pair being subbasal, the other subapical; ovipos- 

 itor short and of normal Tipuline structure Ctenophora Meigen 



11. Wings with vein R3 bent strongly caudad before end, thence angu- 



larly deflected cephalad, cell R3 thus being much constricted at 



near midlength; western and tropical Holorusia Loew 



Wings with vein R3 straight or only gently arcuated throughout its 

 length, not constricting the cell (20) 12 



12. Flagellar segments without verticils, the lower face of individual 



segments produced to give the organ a serrate appearance; terminal 

 flagellar segment abruptly more slender, north temperate to arctic. 



Prionocera Loew 

 Flagellar segments verticillate, simple or nearly so 13 



13. Abdomen in both sexes greatly elongated, somewhat resembling that 



of a dragon-fly; verticils of outer flagellar segments very long and 

 conspicuous; valves (cerci) of ovipositor with smooth margins; 



eastern. (Longurio) 14 



Abdomen not so elongated (except in female of Tipula longiventris 

 Lw., which has the cerci of ovipositor serrate on margins); anten- 

 nal verticils of moderate length only 15 



14. Wings with cell M, sessile Longurio: .^schnasoma Johnson 



Wings with cell M, petiolate Longurio: Longurio Loew 



15. Wings with Rs short and oblique in position, shorter than m-cu; cell 



M, sessile or very short-petiolate; vein Mi arising opposite or basad 

 of origin of M,+:.; body-coloration highly polished, often black and 



yellow Nephrotoma Meigen 



Wings with Rs elongate, exceeding m-cu; cell M, petiolate; vein 

 M, arising distad of origin of M,«; body-coloration usually opaque, 

 pruinose or pollinose (20). (Tipula) 16 



16. Wings with cell M, lacking; arctic Tipula: Nesotipula Alexander 



Wings with cell Mi present 17 



17. Size very small (wing not exceeding 9 mm.); vein Rn2 entirely 



atrophied; tropical Tipula: Microtipula Alexander 



Size larger (wing over 10 mm.; in species with R,.^ atrophied, wing 

 over 12 mm.) ; R,+:. usually preserved 18 



