[Berliner Entomolog. Zeitschrift Bd. XXX. 1886. Heft II.] 153 



Studies on Tipulidae. 



Part. I. Review of the published genera of the 



Tipulidae longipalpi, 



C R. Osten Sachen. 



Introduction. 



For many years, in fact ever since the publication of the fourth 

 volume of the Monographs on N. Am. Diptera (1868), it has been 

 my intention to publish a Genera of the Tipulidae, consisting 

 of a revföed reprint of whatever refers to genera in the above-named 

 volume, with the addition of such new forms as I hoped to discover 

 in different public and private collections. My hopes however were 

 doomed to disappointment, as most of the european Museums which 

 I visited offered very little material. The Tipulidae unfortunately 

 still remain too much neglected by coUectors. Abandoning therefore 

 my original plan, I concluded to publish without further delay some 

 of the materials I had brought together towards its execution. In- 

 complete and disconnected as these materials are they will be of use 

 to those who, some time or other, will take up again the work of 

 the Classification of the Tipulidae. 



I begin with the Tipulidae longipalpi, which I have not 

 absolved in my monograph. 



The distinguishing characters between the Tipulidae longi- 

 palpi and brevipalpi have been explained at length in the above- 

 quoted volume of mine, p. 17 — 21. They consist for the longi- 

 palpi: 



1. In the course of the auxiliary vein, which ends in the first 

 longitudinal, being incurved towards it; beyond the humeral crossvein 

 there is no other crossvein connecting the auxiliary vein with the 

 Costa or.the first vein. 



2. In the structure of the cells round the stigma. The first 

 longitudinal vein is usually incurved towards the second and atte- 

 nuated in a peculiar manner before ending in it; an oblique cross- 



