DIPTERA. 337 
at least in one of the sexes, and the third is lenticular and trans- 
versal. 
The palpi project *. 
Leptis, Fab. Meig.—olim Ruaaio, Fab., 
Where the last joint of the antennz is almost globular or ovoid, 
always terminated in a point, and never transversal. 
In some, the antenne are shorter than the head, and their three 
joints are nearly of equal length, 
Here, the palpi project. 
Such are the Leptis, Macq,. where the third joint of the antenne 
is ovoid or pyriform. 
L. scolopacea; Musca scolopacea, L.; Némotéle becasse, De 
Geer, Insect., VI, ix, 6. Thorax black; abdomen fulvous, with 
a range of black spots on the back; legs yellow; wings macu- 
lated with brown. Very common in woods. 
There, the palpi are raised vertically, forming the Chrysophilus of 
that naturalist, and united to Atherix by Fabricius. 
In the others, the antenne are as long as the head, the first joint 
elongated and cylindrical, the second short, and the third conical; 
the palpi are turned up. The posterior thicker than in the preceding 
subgenera. The abdomen is linear. 
L. vermileo; Musca vermileo, L.; Némoteéle ver-lion, De Geer, 
Ibid., x. Resembling a Tipula; yellow; four black streaks on 
the thorax; the abdomen elongated, with five ranges of black 
spots; wings immaculate. 
The larva is almost cylindrical; its anterior portion is much 
the smallest, and there are four mandibles on the opposite extre- 
mity. It resembles a stick-like geometra (caterpillar), and is 
equally rigid when withdrawn from its domicil. It bends its 
body in every direction, advances and moves about in the sand. 
and excavates there an infundibuliform cavity, at the bottom of 
which it secretes itself either entirely or partially. Ifan Insect 
be precipitated into the trap it rises suddenly, clasps it with its 
body, pierces it with the stings or hooks of its head, and sucks it. 
It flings away the carcass as well as the sand, by bending its body, 
and then suddenly relaxing it, like a bow. 
The pupa is covered with a layer of sand. 
M. de Romand, paymaster-general at Tours, who makes a par- 
ticular study of the Insects in his vicinity, has again observed 
the metamorphoses of this Insect, and sent me several living 
larvee, some of which I preserved in that state for three years f. 
The Clinoceree—Crinocera—of Meigen, by their wings, seem to 
belong to the following division. 
The other Tanystoma of our second division have their wings in- 
cumbent on the body, and exhibit at most but two complete or closed 
cells. The antennze terminate in a palette, almost always accom- 
* See the works just quoted. 
+ For the other species, see Fabricius, Meigen, and Macquart. 
