HYMENOPTERA. 213 
Prerycopuorus, A /ig., 
Where the antennz have but a single range of teeth, and simply 
longer or pectinated in the males, and short and serrated in the fe- 
males; here they are evidently enlarged at the extremity *. 
Lorxuyrus, Lat., 
Where the antennee, in the males, have a double range of elon- 
gated teeth forming a large triangular panache, and are serrated in 
the females, 
To this subgenus I refer the first family of the Pterones of M. Ju- 
rine, as well as the first division of the Hylotome of Fabricius. The 
larvee or pseudo-caterpillars live in society, more particularly on the 
Pines. They are very injurious to the young plants f. 
There, the labrum 1s concealed or but slightly salient. The inner 
side of the four posterior tibic, anterior to its extremity, presents two 
spines, and frequently even a third above the preceding pair. The 
antenne are always multiarticulated, the head is large, square, placed 
on a little neck, and has strongly crossed mandibles. ‘They appear 
in spring. 
The larve of the greater number are destitute of membranous 
feet, and inhabit silken nests of their own spinning, formed round the 
leaves of various trees. 
They constitute the genus Cephalcia of Jurine, which has been 
divided into two. 
Mecatopontss, Lat.—Tarpa, Fab., 
Where the the antenne are serrated or pectiniform f. 
Pampuiius, Lat.—Lypa, Fab., 
Where those organs are simple in both sexes. 
Their larvee are destitute of membranous feet, and the posterior 
extremity of their body is terminated by two horns. They feed on 
leaves, which they frequently double in order to remain concealed §. 
In the last of the Tenthredinete, the ovipositor is prolonged be- 
yond its groove and projects posteriorly. The inner extremity of the 
two anterior tibize presents distinctly but a single spine, curved and 
terminated by two teeth. The antennee are always composed of a 
great number of simple joints. 
Xyevsa, Dalm.—Pinicota, Breb.—Mastigocerrus, Klig. 
The Xyelze are very distinct by their geniculate antenne forming 
a sort of whip, that are abruptly attenuated near their extremity, and 
consist of eleven joints, the third of which is very long; as well as by 
* See Kliig, Leach, and Lepeletier, Ibid. 
t+ Lepelet., Ibid., and the Monog. of this subgenus, published by Kliig, in the 
Mem. Nat. Cur. of Berlin. 
} See the preceding works, and the Entom. Monog., Kliig, p. 183. 
§ Ibid. Encye. Méthod., article Pamphilie, and the Monograph of the genus 
Lyda of Kliig, in the Mem. Nat. Cur. of Berlin. See also the Monograph of M. 
Lepele tier. 
