DIPTERA. 235 
Rutpipia, Meig. 
The only Tipulariz of this subdivision in which the antennz of 
the males are pectinated(1). 
EriorTerA, Meig. 
_ Several nervures in the wings, as in those of the preceding Tipu- 
lz, but covered with hairs(2). 
Lastoprera, Meig. 
Where the wings are also hairy, but present only two ner- 
vures(3). 
Limnosia, Meig. 
Where the wings are glabrous and the antenne simple in both 
sexes(4).. 
The Potymera of M. Wiedemann—Dipt. Exot., p. 40—appear to 
be distinguished from the Limnobiz by their antennze which con- 
sist of twenty-eight joints, instead of from fifteen to seventeen. 
In the other subgenera, the antennz are terminated by several 
joints evidently.more slender and almost cylindrical. 
Tricnocera, Meig. 
The first joints of the antennz almost bordering on an oval, the 
following ones more slender, long and pubescent. 
The Zipule @hiver of De Geer, which resembles a Culex, be- 
longs to this subgenus(5). 
(1) Idem. 
(2) Idem. 
(3) Idem. 
(4) Idem; but after removing the Pediciz. 
(5) See Meig., Ibid. 
