178 ©. R. Osten Sacken: 
Hardly any Limnobiae are found in collections, besides those 
from Europe and North-America. L. infiwa Walk. from New-Guinea 
reproduces the european type. The South-American species Limno- 
bia diva Schiner and a mexican species in the Berlin Museum have 
a supernumerary crossvein in the submarginal cell. 
Mr. Beling (Verh. Z. B. Ges. 1873, p. 590—591 and 1878, p. 
53—56) has described the early stages of five european species. 
Limnomyza Rond. Was proposed for the group of species in 
which the marginal crossvein is at some distance from the tip of the 
first vein (like L. tripunctata.) 
Trochobola. 
OÖ. Sacken, Monogr. etc. IV, p. 97; 1868. 
Discobola (preoccupied) O. Sacken, Proc. Ent. Soc. Phil. 1865, 
p. 226. 
Professor Mik has discovered both T. annulata and caesarea 
O0. S. in Upper Austria and has confirmed the specific rights of the 
latter species. In an article entitled: Ueb. die Artrechte von 7. cae- 
sarea (Verh. Z. B. Ges. 1878, p. 617—626, Tab. 10, f. 7—12) he 
gave an exhaustive survey of the literature of Trochobola, with figu- 
res of the wings and of the male forceps of the two species. Later, 
he described the pupa of 7. caesarea (Wien. Ent. Z. 1884). This 
species has also been found near Moscow (Fedchenko, List of Dipt. 
of the environs of Moscow, 1868, p. 44). The North-American 7. 
argus is very like the european species. 
Trochobola also occurs in $. E. Australia and especially in 
New-Zealand. I know now at last three easily distinguishable species 
from these regions. 
Dapanoptera. 
OÖ. Sacken manuscript name, apud 
Westwood, Trans. Ent. Soc. London 1881, p. 365, Tab. 17, f. 2. 
A true Limnobia, in the sense of my Monograph, (Monogr. N. 
Am. Dipt. Vol. IV, p. 84) with 14-jointed antennae, a male forceps 
with a distinet style (adminiculum) on the underside, dentate claws, 
the auxiliary vein ending about the middle of the distance between 
the origin of the praefurca and the end of the first vein. The pe- 
culiar, although only secondary character, upon which this genus is 
established, is found in the wings, which being deeply colored, have 
a conspicuous hyaline spot at the end of the first longitudinal vein; 
upon reaching this spot, the first vein becomes abruptly evanescent; 
both of its ends (that is, the crossvein, running towards the costa, 
