TIPULIDAE. 1 1 



0. S., Idioptera Macq., Lasiomastix 0. S., Dactylolabis 0. S., 

 Prionolabis 0. S. ; as Limnobina may also be mentioned the fossil 

 genera which have been found in Prussian amber : Trichoneura, 

 Calobamon, IIaploneura, Critoneura, Tanymera, Tanysphyra, 

 Styringomyia, Ataracta, and Allarithmia. As genera of 

 doubtful location we may add the genus Polymera Wied., and the 

 anomalous genera Dixa Meig. and Chionea Dalm. 



"We know as genera of Tipulina occurring in N. A. the follow- 

 ing : Tipula, Pachyrhina, Ctenophora, Ptilogyna, Ptychop- 

 tera, Protoplasa, Hesperinus, Bittacomorpha, and RlIAMPHI- 

 pia. About the genera and species of Limnobina indigenous in 

 N. A., Baron Osten Sacken, in the Proceedings of the Academy 

 of Natural Sciences of Philadelphia, 1859, has published a detailed 

 and valuable paper, which enters into a more complete and tho- 

 rough exposition of the system of this section than is possible for 

 me to give here. I must, therefore, refer to this paper. The 

 species enumerated in it, most of which are new, belong to the 

 following genera: Limnobia, Rhipidia, Geranomyia, Dicrano- 

 myia, Antocha, Elephantomyia, Limnobiorhynchus, Dicranoptycha, 

 Teucholabis, Erioptera, Symplecta, Cryptolabis, Gonomyia, Gno- 

 phomyia, Cladura, Trichocera, Anisomera, Arrhenica, Eriocera, 

 Dicranota, Via, Amalopis, Pedicia, Limnophila, Epiphragma, 

 Dicranophragma, Idioptera, Lasiomastix, Dactylolabis, and Prio- 

 nolabis ; also Dixa and Cliionea are recorded as N. A. genera. 



Note. — The special attention which I have, for several years, paid to 

 the family of Tipulidce may serve as an excuse for my expressing here 

 my views on its distribution. Although these views are founded merely 

 on the study of the species of this continent, the new character which I 

 introduce for the definition of the two principal sub-families may also 

 prove useful for the classification of the Tipididcc of other countries. 



I divide the American species of Tipulidce, at present known, into three 

 sub-families, as follows : — 



I. The auxiliary vein ends in the first longitudinal vein; besides the hu- 



meral cross vein, there is no other cross vein between the auxiliary 

 vein and the first longitudinal vein or the costa ; last joint of palpi 

 very long, filiform, generally longer than tbe three preceding taken 

 together. Tipulina. 



II. The auxiliary vein ends in the costa ; there is a cross vein between it 



and the second longitudinal vein, generally more or less approxi- 

 mated to the tip of the first longitudinal vein, sometimes more 



