174 ©. R. Osten Sacken: 
the perfectly distinet venation render, in my opinion, the identifica- 
tion certain. There were two specimens, showing the same proboseis. 
Rhipidia. 
Meigen, Syst. Beschr. I, p. 153, Tab. 5, f. 9—11; 1818. 
O. Sacken, Monogr. ete. IV, p. 811); Tab. 3, f. 5 (forceps). 
Is probably cosmopolitan; species from Europe (4). North-Ame- 
rica (3), South-America (1) and Africa (1) are known. The early 
stages of two european species have been described by Mr. Beling 
(Verh. Z. B. G. 1873, p. 18 and 1878, p. 52). 
Peripheroptera. 
Peripheriptera Schiner, Verh. Zool. Bot. Ges. 1866, p. 933. 
Peripheroptera Schiner, Reise d. Novara, Dipt. p. 47, Tab. 2, 
f. 3; 1868, 
In introdueing this genus, Schiner did not grasp its peculiari- 
ties fully, because in the same volume of the Reise der Novara 
(p. 43) he describes a Rhamphidia aberrans 9, which is a Peri- 
pheroptera. 
Peripheroptera is a tropical form of Dieranomyia; it has all 
the essential characters of that genus; but they are very much dis- 
guised under the disproportionate development of certain parts, and 
principally of the venation. 
The distinctive character of the genus consists in the unusual 
development of the portion of the wing between the root and the 
proximal end of the basal cells. This interval, generally very short 
among Tipulidae as well as in other diptera, has not yet been used 
for purposes of classification, and its parts, for their smallness, have 
not been distinguished by particular names. In FPeripheroptera 
Schineri & however, that interval occupies one third, in P. incom- 
moda & nearly one half of the length of the wing, and contains 
several distinct cells, the principal of which, a triangular cell, is 
separated from the two basal cells by a stout crossvein. The con- 
sequence of this excessive elongation of the proximal portion of the 
wings, is a change in their general outline; their proximal; half is 
unusually narrow, the anal angle almost reduced to nothing and the 
interval between the seventh vein and the posterior margin (the 
spurious cell) narrow, linear. 
Another character, peculiar to Peripheroptera is the large 
size of the stigma of the male, which nearly fills out the whole space 
between the costa and the second longitudinal vein; in the female, 
1) On that page, line 16 from bottom read movable for immovable, 
