150 C. H, TYLER TOWNSEND. 



2. — Wing of % with a moderately large opaque knob in middle.. .o Uloiiiyia. 

 Wing without such knob, normal in both sexes o Pericoina. 



Family TIPULID.^. 



1.— Wings wholly wanting: species .spider-like in appearance (subfani. Eriop- 



terima pt.) Cliioiiea. 



Wings always present, rarely stunted and rudimentary in 9 '~- 



•2. — Seven longitudinal veins present 5. 



Only six longitudinal veins (subfam. Ptychoi)teriiia) 3. 



3. — Subcostal cross-vein absent, first submarginal cell much longerthan second. .4. 

 Subcostal cross-vein present, second submarginal cell much longer than first ; 



six posterior cells Itlioplasta. 



4. — Three posterior cells; autennte 20-jointed, tibial spurs weak. 



Bittacoiiiorplia. 

 Four posterior cells; antennse 16 jointed, tibial spurs strong. 



Ptychoptera. 



.5. — Last joint of palpi shorter, or not much longer than the two preceding joints 



together;"- auxiliary vein usually ending in costa and connected with 



first vein by a cross-veint (sec. Tipulidse hrevipalpi} 16. 



Last joint of palpi very long, whip-like: auxiliary vein ending in first vein, 

 and not connected by any cross-vein with either first vein or costa, ex- 

 cept by humeral cross-vein with latter (sec. Tipulidfe longipalpi) 6. 



6. — Legs extremely long and slender, especially the tarsi ; anterior branch of 



second vein absent, obsolete or perpendicular (subfam. Dolichopezina)..?. 



Legs not uncommonly slender; anterior branch of second vein present and 



oblique 10. 



7. — Antenna; 13-jointed: anterior branch of second vein wholly absent; % 



forceps complex Dolicliopeza. 



Antennse 8- to 11-jointed ; % forceps simple 8. 



8. — Fifth posterior cell not in contact with discal cell ; wings hyaline. 



]VIegistocera. 



Fifth po.sterior cell in contact with discal cell ; wings not hyaline 9. 



9. — :Head on a neck-like prolongation of thorax; seventh vein short, running 



into anal angle Brachypreiiina. 



Head not on such prolongation: seventh vein terminating in margin some 



distance from anal angle Tatiypremna. 



10. — Antennae, of % pectinate (subfam. Ctenophorina) 11. 



Antennae not pectinate (subfam. Tipulina «.,s<;-.) 12. 



11. — Antennae of % short pectinate on inside, outside and below ; 9 with a very 



long sword-like ovipositor Xipliura. 



Antennae of % pectinate on inside and outside, but not below; 9 with a 

 moderately long, but never sword-like, ovipositor.. Ctenophora. 



* In Pedicia the last joint of palpi is nearly one and a half times as long as 

 the three preceding joints together; but the auxiliary vein ends in the costa, 

 and is connected with the first vein by a cross-vein. 



t In Antocha the auxiliary vein ends in the fii-st vein, but the palpi are not 

 whip-like. 



