DIPTERA. 315 
Tueruritis, Lat. Fab. Fall.— 7 rypeta, Meig.—Dacus, Fab. 
Where the abdomen is similarly terminated; but the head, seen 
from above, is rather transversal than longitudinal, and rounded. 
The species in which the palette is more elongated, form the genus 
Dacus of Fabricius. Of this number is the one that usually attacks 
the Olive, which he however places among his Oscini. It is red- 
dish, with the top of the thorax, some streaks on the back and scu- 
tellum excepted, blackish; the sides of the superior part of the 
abdomen are also spotted with blackish. The scutellum is salient. 
Coquebert has figured it in his Illust. Icon. des Insect. XXIV, 16. 
T. cardui; Musca cardui, L.; Réaum., Insect. III, xlv, 12— 
14, Blacks; head and legs fulvous-brown; a zigzag brown line 
on the wings. The female perforates the stem of the Carduus 
hemorrhoidalis, in order to deposit her eggs there, and a gall- 
like excrescence soon forms, which serves for food and shelter 
to the larve. 
The inhabitants of the Isle of France can scarcely obtain per- 
fectly sound and ripe lemons, on the account of the abundance 
of a dipterous Insect of the same genus, which deposits its eggs 
in them(1). 
Sometimes the head is most compressed transversely, so that its 
superior plane is more inclined than in the preceding species, and 
the antennz, when viewed in profile, appear to be inserted near the 
middle of the face. The proboscis is very thick and partly salient. 
The wings are separated horizontally, and the abdomen presents 
exteriorly but four segments. 
Pratystoma, Meig.—Dictya, Fab.(2) 
This last subgenus manifestly leads us to the Zimiz of Wiede- 
mann, closely approximated itself to our Mosilius and Lauxania, and 
to some other subgenera of M. Meigen. 
They will close our eighth division, that of the GymNnomyziDEs. 
These Muscides are small, witha short, thick, arcuated and almost 
glabrous body of a glossy-black colour. Their head is strongly 
compressed transversely, like that of the Platystomz, is of a uni- 
(1) See Meigen. 
(2) Idem. 
