322 INSECTA. 
Liunosia, Meigq., 
Where the wings are glabrous, and the antennz simple in both 
Sexes *. 
The Potymera of M. Wiedemann—Dipt. Exot., p. 40—appear to 
be distinguished from the Limnobiz by their antennee, which con- 
sist of twenty-eight joints, instead of from fifteen to seventeen. 
In the other subgenera, the antenne are terminated by several 
joints, evidently more slender, and almost cylindrical. 
Tricnocera, Meigq. 
The first joints of the antenne almost bordering on an oval, the 
following ones more slender, long, and pubescent. 
The Tipule d’hiver of De Geer, which resembles a Calex, 
belongs to this subgenus f. 
Macropeza, Mevq. 
The Macropezee are distinguished by the extraordinary length of 
their posterior legs. Their antennz, to a little more than half their 
length, are densely pilose {. 
Dixa, Meigq. 
The Dix are apparently closely allied to the Trichocerz, but the 
first joint of their antennz is very short, the second is almost glo- 
bular, and the following enes are proportionally more slender. The 
last joint of the palpi is also more elongated than in Trichocera §. 
There the antenne have but ten or six joints. 
Those, in which they consist of ten, form the genus 
Mexistocera, Wied., 
Where the wings are distant ||. 
Those in w hich they are composed of six form the 
Hexatoma, Lat., 
Which will comprise the Anisomere and Nematocere of Meigen, 
which only differ from the Hexatome by the third joint of the an- 
tenne being there longer than the second : in this respect it differs 
but slightly from the others § |. 
Other Tipularie, analogous to the preceding ones in the absence 
of ocelli, and the rounded figure of their eyes, exhibit a rare anomaly 
in this order of Insects: they are destitute of wings, and hence the 
origin of the term Aptera, w hich we apply to this subdivision. The 
antenne are filiform, but somewhat more slender towards the extre- 
mity, and but slightly pilose. The legs are long, and the tibiz 
unarmed. ‘The abdomen of the females terminates ina point formed 
by a bivalve ovipositor. 
This subdivision comprises the Benue 
* See Meig., Dipt. I, 155.; Lat., Gen. Crust. et Insect., IV, 254; but after 
removing the Pedicie.. 
+ See Meig., Ibid. 
+ Idem. 
§ Meig., Ibid., and Macq., Bape. du nord dela France. 
\| Dipt. Exot., p. 41. 
J Lat., Gen. Crust. et Insect., IV, 260; Meig., Ibid. 
