225 
line and most probably belong to Dicranomyia (g. v.). Exclud- 
ing therefore these two, the species of Tipula found fossil in America 
may be separated by the following table : 
Table of the Species of Tipula. 
Al, .Preefurca relatively long, as long as, generally longer than, the breadth of the 
first and second basal cells together next its base; or, 
half as long as the intersected apical area of the wing 
beyond the basal cells. 
b!, Wings immaculate except at stigma. 
cl. Markings of the abdomen linear and light. 
ad Wings exceeding,/28 nim. inlength.:.....-.6.-.% magnifica. 
d?. Wings less than 26 mm. in length. 
els Wings 21 mm:jor moreim length. ....%.5.-0...-.- vIgens. 
e?, Wings between 16 and 21 mm. in length...../lortssanéa. 
e’, Wings less than 16 mm. in length. 
f!. Discal cell fully twice as long as broad....... clauda. 
f2, Discal cell less than twice as long as broad. sepulchri. 
c?, Markings of the abdomen oblique and heavy. 
d!. Larger species, the wing length exceeding 20 mm. revivificata. 
d?, Smaller species, the wing length less than 17 mm.. .evanitura, 
b?, Wings maculate or discolored along the veins. 
c!, Abdomen with transverse markings...............-06+- macluret, 
c?, Abdomen with longitudinal markings. 
d', Larger forms, the wings exceeding 19 mm. in length. 
el, Proefurca of ordinary length, not much exceeding the breadth 
of the first and second basal cells together, next its 
base; wings relatively slender, nearly or quite four 
timesias Lome, as) broadiytcat.r eid das = sek heilprint. 
e?, Prefurca exceptionally long, exceeding the breadth next its 
base of the combined first and second basal and anal 
cells ; wings relatively broad, not exceeding three and 
Aphalietinres thet Dread tl scprs se sve sree tartari, 
d?, Smaller forms, the wings not reaching a length of 19 mm. 
el, Wings not more than four times as long as broad. 
f1, Discal cell relatively short and broad, less than twice 
as long as broad ; petiole of second posterior cell rela- 
tively long, much more than half as long as the cell. 
caroline. 
f?, Discal cell relatively long and narrow, at least twice 
as long as broad; petiole of second posterior cell 
relatively short, not more, generally much less, than 
hal fias loneyasylhe discalicelllsy 1) s1)-1 9 oes /-t0 limi. 
e?, Wings more than four times as long as broad. zwdernecata. 
PROC. AMER. PHILOS. SOC. XxxiI. 148.2¢. PRINTED JAN. 13, 1894. 
