158 C. R. Osten Sacken: 



The male alone is known o{ Bihioc., Agathon, lAp. hiloh., Lip. 

 yosem.^ Hainm.^ Faltost. ^ Hapal. 



The feniale alone is known of Snotvia and Blepli. ancüla. 

 Behaviour. 



Lipon, ein. cf has been seen execnting aerial dances (Macq. 

 Ann, etc. 1844; his Bleph.limhip. cf)\ I iowwA Lip.yosem. o.ngixgoÄ 

 in the same manner; Hapal. was observed disporting theniselves 

 above water. Bleph. cap. I caught with the catcher in the grass, in 

 both sexes. — Other data are wanting. Schiner (Fauna, IT, p. Go7, 

 footnote) relates an Observation of Mik that Blepli. nses to hang on 

 leaves, by holding on with their long legs. 



III. The subdiYision of the Liponeuridae in groups. 



As I Said above, for several years past, I have had but little 

 opportunity for continuing my studies on liiponeuridae in nature, 

 or even in collections. I am therefore compelled, with regard to 

 the natural grouping of the known genera, merely to repeat what I 

 Said about them in 1878 (p. 412). 



At that time I recognized three groups in the family, two prin- 

 cipal ones, distinguished by the presence or absence of the incomplete 

 vein on the posterior margin of the wings, and an abnormal one, 

 containing the Single genus Hapalotlirix. 



The tirst group contains at present two subgroups, each repre- 

 sented by two closely related genera: Bibiocephala and Agathon\ 

 Blepharocera and Liponeura. I noticed in 1878 that the genera 

 of this group seem to prevail in the temperate zones of the continents, 

 and even to reach the cold zone. Bleph. capitata, described by 

 Walker as Asyndulum teniiipes{\) was found at S. Martin's Falls. 

 Albany river, Hudson's Bay. The latitude of this locality is 52", 

 about the same as Berlin, a latitude which, in the Western hemi- 

 sphere, almost corresponds to an arctic fauna. The yearly isotherm 

 of S. Martin's Falls passes considerably north of the North Cape; its 

 isotherm for Juli passes through the North of Scotland (compare 

 Dr. Hann's Atlas der Meteorologie, 1887, in the new edition of 

 Berghaus's Physic. Atlas). Bibiocephala and Agathon were found 

 in the temperate zone (Rocky Mts. and Nevada), but at rather high 

 altitudes. 



The second group contains now live genera: Apistomyia, Hatn- 

 matorrhina, Paltostoma, Snowia and Curupira. They occur in 

 the tropical zone, and in the warmer regions of the temperate zone. 



