NO. 2344. SVPERFAMILY TIPULOIDEA— ALEXANDER AND McATEE. 425 



8. Cross vein r removed from the tip of Ri, so tliat the distance beyond it is 



from one to one and one-half times the length of r; tuberculate pits 



present 9. 



Cross vein r at the tip of Ri ; tuberculate pits lacking 18. 



9. Cell first Mz very much elongated, the inner end lying far inside the level 



of the cord L. areolata (p. 426). 



Cell first Mn not greatly elongated, the inner end at the level of the cord__10. 



10. R2*s longer than cell R2 alone; cross vein r on R^^s L. ultima (p. 428). 



R2*s not longer than R2 alone; cross vein r on R2 11. 



11. Cell Ml very short, not longer than the basal deflection of Cth 



L. brevifurca (p. 426). 

 Cell Ml long, more than half again as long as the basal deflection of Cui — 12. 



12. Head narrow, prolonged behind ; cells Ri and fl^rst M2 longer than cell Rs, so 



that the cord is not in a straight line ; radial and medial veins long, slen- 

 der, arcuated; second anal vein incurved at the tip (luteipennis 



group) 13. 



Head broad, not narrowed behind ; cells Rs, R^, and first M-, with their 

 inner ends about on a level ; radial and medial veins stout and straight ; 

 second anal vein not incurved at the tip (tcnuipes group) 16. 



13. Wings with small dots on the cross veins and at the forks 



Body shiny reddish yellow; front yellowish red L. reconditu (p. 427). 



Wings clear, unspotted 14. 



14. Thorax clear blue-gray L. inornata (p. 427). 



Thorax brownish without gray 15. 



15. Pleura of thorax grajrish, unmarked; size small. (Regional) 



L. contempta Osten Sacken. 

 Pleura of thorax dull yellowish with a conspicuous dark-brown stripe ex- 

 tending from the cervical sclerites to the postnotum ; size larger 



L. nigripleura (p. 427). 



16. Wings narrow, grayish ; stigma distinct, hairy ; antennae of the male 



elognated L. tenuipes (p. 428). 



Wings broader, more yellowish brown; stigma indistinct; antennae short 

 in both sexes 17. 



17. Body opaque; front gray. (Regional) L. imhecilla Osten Sacken. 



Body shiny reddish yellow; front yellowish red L. recondita (p. 427). 



18. Very large species; wings about 20 mm. long L. alleni (p. 426). 



Smaller species; wings under 15 mm 19. 



19. Ri+s very long, nearly twice the length of R2 alone: cross vein r on 



R2*3 L. ultima (p. 428). 



R 2\ shorter, not longer than R 2 alone ; cross vein in r on i? 2 20. 



20. Basal deflection of Cui at the inner end of cell first M2; wings spotted with 



brown L. niontana (p. 427). 



Basal deflection of Cu 1 near the middle of cell first M 2 21. 



21. Wings spotted with brown or distinctly seamed along the cross veins and 



deflections of veins 22. 



Wings clear or with only the stigmal spot ; Rs and R 2+3 strongly arcuated ; 

 cell fi,i'st M2 broad L. toxoneura (p. 428). 



22. Wings heavily irrorate with brown over the entire surface — 



L. irrorata (p. 427). 

 Wings not as above 23. 



23. Rs short, arcuated to almost square at its origin; r at about midlength of 



vein R2 which is oblique; outer end of cell Ri very broad, due to the 

 oblique course of vein R 2 ; body yellow or reddish, the tips of the wings 

 darkened L. adusta (p. 426). 



