On the Diptera of the Amber-fauna. . 317 
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The comparison of the North American Diptera with the 
possible to me, on a very extended 
scale, through the study of the collections of Baron Osten 
ken; this comparison showed a surprisingly large number 
hese species, 
from 2 83h species, common to both continents, I ean ison Sear 2° co 
_, 2 personal investigation, the following: A les maculipennis , A 
Pleles quadrimaculates ‘Say =pictus LW), Anopheles nigripes Staeg., Tanypus 
choreus Meig., Ceratopogon lineatus Meig., Cecidomyia ~ serdar sad Say (=funesta 
Motch + = secalina Lw.), Seat trata Say (= recurva Lw i: : Linn., 
Aspistes borealis Lw., f Fear 9 fenestralis Scop., Rhyphus punctatus Meig. (= me 
J Say), Ce ia. ferruginea Fab. (= palli a Say), viridis Say 
Jrontalis Lw.), provided the specimen, communicated to me as. : 
a to the old world, Hristalis enens » (= xencerus wll 
ticata Fab. (= cimbiciformis Fall.), Syritta pipiens Linn, Xylota pigra Fab. (=ha- 
snide 6 
