[Berliner Entomolog. Zeitschrift Bd. XXXI. 1887. Heft II.] 163 
Studies on Tipulidae. 
Part. I. Review of the published genera of the 
Tipulidae brevipalpi, 
by 
©. R. Osten Sacken. 
Preface. 
In publishing this second instalment of my „Studies etc.“, I re- 
peat what I said in the preface to the first: that unable to fulfil 
my original plan of bringing out a Genera of the Tipulidae 
I publish the material I had collected for its execution. As the 
classification of the Tipulidae brevipalpi and the description of 
all their genera known at that time has been given in considerable 
detail in the fourth volume of the Monographs of North- American 
Diptera, the present paper is merely intended as a Supplement to it, 
bringing the subject up to date; hence the constant references to 
that volumet). Like the first part of these Studies, the present one 
is, in a great measure, composed from notes, taken by me in different 
colleetions. This mode of composition, besides being very laborious, 
involves considerable risks of error and confusion. If, instead of 
my notes, I had the specimens themselves before me, I might perhaps 
have obtained more satisfactory results and avoided some blunders 
(like that about Ctedonia). As it is, what I can offer, is often an 
exposition of my doubts and hesitations, much more than of positive 
results. But even in this shape I hope that my work will spare 
some amount of labor to those who will come after me. 
To these successors I am free to give a piece of advice, as the 
result of more than 30 years experience with Tipulidae, and this is, 
not to introduce new genera prematurely: Large accessions of new 
forms, or of variations of already well-know forms must be expected 
from as yet unexplored, principally tropical regions; but these acces- 
1) The fourth volume of the „Monographs‘‘ besides being often 
advertised iu the Catalogues of booksellers, may be found in most of 
the larger publie libraries under the heading of: ‚‚Smithsonian Mis- 
cellaneous Collections, Vol. VIII“. I insist upon this detail, because 
the Monographs have often been missed in libraries for not being ca- 
talogued as a separate work. 
XXXI Heft I. 11 
