234 INSECTA. 
Tiruta, Lat. 
Where the antenne are short, setaceous, and simple, but where 
all the joints, the second one excepted, which is almost globular, 
are nearly cylindrical; the first is the largest, the third elongated. 
T. oleracea, L.; De Geer, Insect., VI, xvi, 12, 13.. Antenne 
simple; body greyish-brown and immaculate; wings light-brown, 
darker on the external margin. Very common in meadows on 
the grass. The larva feeds on the roots of decomposed 
plants(1). ; 
Nepuroroma, Meig. 
Where the antennz are still simple and almost setaceous, with 
the first and third joints elongated and cylindrical, and the follow- 
ing ones arcuated; those of the males consist of eighteen, the fe- 
males have but fifteen. This number is never exceeded in the pre- 
ceding subgenera, even in the males(2). 
Prycuorrera, Meig. 
Where those organs are always simple and nearly setaceous, con- 
sisting of sixteen joints, the third of which is much longer than the 
others, and the following ones oblong. The lips of the proboscis 
are inclined and very long(3). 
In all the following subgenera the last joint of the palpi is hardly 
longer than the others, and presents no appearance of annular divi- 
sions. ‘The wings are frequently incumbent, one on the other. 
Here the antennz have more than ten joints. 
Those, in which they are mostly granose, of equal thickness, or 
hardly smaller at the extremity, and frequently furnished with 
whorls of hairs, according to Meigen, form various genera. 
(1) Lat., Ibid.; Meig., Ibid. 
(2) Meig., Ibid. 
(3) See Meig., Ibid.; Lat., Gen. Crust. et Insect., IV, 254. 
