336 INSECTA, 
Two species, one of which—Cytherea fasciata, Fab.—is found 
in Italy and in ci-devant Provence, differ but little as to the re- 
ticulation of their wings from the Anthraces. They form the 
genus Fatuenia of MM. Meigen and Wiedemann. According 
to them, the proboscis is susceptible of being curved beneath 
and along the pectus *. 
The genus Cotax of Wiedemann—Anal. Entom., xvii, fig. 8—in 
general appearance, antenne and wings, appears to us to approxi- 
mate in the last mentioned Anthraces, but according to that gentle- 
man the oral cavity is closed as in (strus, and the ocelli are wanting. 
Our second general division of the Tanystoma is characterized by 
a membranous proboscis, usually with a short stem, projecting but 
slightly and terminated by two very distinct and raised or ascending 
lips. 
The form of the head in the larvee of the last Diptera of this divi- 
sion is variable. 
In some—Leptides—the wings are distinct, and exhibit several 
complete cells. The antennze are not terminated en palette. The 
palpi are filiform or conical. 
Sometimes these palpi are withdrawn into the oral cavity. The 
antenne have a fusiform termination or one resembling an elongated 
cone, with a little articulated stilet at the end +. 
Tuereva Lat., Meig.—Brisio, Fab., 
To which belongs the following species. 
T. plebeta ; Bibio plebeia, Fab. Black, with cinereous hairs ; 
abdominal annuli margined with white. On plants. 
The larva of a species of this genus—Nemotelus hirtus, De 
Geer—lives in the ground and resembles a little serpent. Its 
body is white and pointed at both ends. It changes the whole 
of its skin when about to become a pupa f. 
Sometimes the palpi are exterior. The last joint of the antenne is 
either almost globular or reniform, or nearly ovoid or conical and ter- 
minated by a long seta. 
The tarsi are furnished with three pellets. They form the genus 
LEPTis, 
Which is divided into several subgenera. 
Atuerix, Meig., Fab., 
Where the first joint of the antenne, larger than the second, is thick, 
* See the authors already quoted, and the Encyc. Méthod., article Némestrine. 
+ This subdivision corresponds to the family of the Yylotoma of MM. Meigen 
and Macquart. 
+ Lat.; Ibid., Fab., Meig..and Macquart. In the collection of Faujas, I saw a 
piece of schist that exhibited the impression of a species of this genus. 
