167 
ing table, where they are given first in numbers and next in per- 
centages. Osten Sacken’s Catalogue of the Diptera of North America 
(1878) is taken for the living American forms, excluding the species 
found only south of the United States; Schiner’s /auna Austriaca 
(1864) supplies the basis for the European forms, including the 
species merely enumerated as well as those described by him, and 
thus including all Europe ; while the results of the present memoir, 
subsequently detailed, have been taken for the remaining columns. 
Comparative View of Recent and Tertiary Tipulide. 
IN NUMBERS. 
(Figures represent number IN PERCENTAGES. 
of species.) 
> Bae al wo. ° 
& 4 ea] a || & % em] w 
a</i¢/S8/88||8 </8 </86/8 5 
eee es GelEelEE|SeligzlEnlee| ez 
m B Fa gimme gy % A Ba i | 
Panstinbini,.Ws ile scesescee.| 39) 13°) 19°)" 186) 23°38)" 28) 4135 
Rhamphidini..... Pe ocaweceeel pte 4 (eS 6 7, 12) 12) 2 
DIDIER ae ANC 7 |p 13 Sie nig Se eo ee 
AANODHUIDT 2.5 sic «ca vietvien ¢ 9 o5 6 42) 4 | 21 SA 925) 2s 3 23 
Amisomerini. . 35.2.0 edone 8) oO 3 5 ° 4 3 
PAIL (HRN oo oct aisyois'a/aim's's'a'e\e es I5| 0 4 22 9 2 6 2 
SEVMBATOLOMIBIG, © ccie'e «ces ces «+ 4| 6 oO il 2} 18 oO 3 
Ptychopterini...... brates Been OG) yk 6 Bo. VOhy a WE ee 
99| 101; 98] 100 
SUBFAMILIES. 
Limnobing.........cseseesee) 167/ 35 | 67 | 249|| 62} 59) 68) 67 
DPMS Veena ede <<a 104| 24 | 3% | 122// 38) 41) 32/ 33 
sRotalseey cece SERS PRO RSENS 271| 59 | 98 | 371|| Too] 100; 100} 100 
This table, and especially the side representing the percentages, 
shows some remarkable features. The relative proportion of the 
two subfamilies is shown to be somewhat different on the two con- 
tinents, whether past or present time is considered, but it presents 
striking similarities when on either continent the tertiary and 
present times are compared, there being in Europe scarcely the 
slightest variation. 
But when the several elements of the Limnobinz are separately 
considered, a somewhat different state of things appears. Here, in 
