88 INSECTA. 
Sometimes the antenne have at least nine very distinct joints, and 
do not terminate suddenly in a club. 
In some, and the greater number, the antenne, always simple in 
both sexes, or at least in the females, have fourteen joints at most, 
and commonly but nine. ’ 
TrenTHREDO, Lat. Fab. 
Or Tenthredo proper, where the antennz consist of nine simple 
joints in both sexes. ; 
The larve have from eighteen to twenty-two feet. 
The number of dentations in the mandibles of the perfect Insect 
varies from two to four. The superior wings also differ in the num- 
ber of their radial and cubital cells. These characters have been 
used to establish several other subgenera, which we will unite with 
the present one. ‘They are composed of the Allantes, Doleres, Ne- 
metes, &c. of Jurine, and of the Pristophose, formed of the third 
family of the Pterones of that naturalist, with some others of Dr 
Leach. 
T. scrophulariz, L.; Panz., Faun. Insect., Germ., C, 10, the 
male. Five lines in length; black; antennz fulvous and some- 
what thickest at the extremity; annuli of the abdomen, the 
second and third excepted, margined posteriorly with yellow; 
tibiz and tarsi fulvous. It resembles a Wasp. ‘ 
The larva has twenty-two feet; white, with black head and 
points. It feeds on the leaves of the Scrophulariz. 
T. viridis, L.; Panz., Faun. Insect. Germ., LXIV, 2. The 
same length; antenne setaceous; body green; spots on the tho- 
rax and a band along the middle of the superior part of the ab- 
domen, black. On the Birch(1). 
De Geer has given us the description of a very singular spe- 
cies in its form of a larva, that which he calls Mouche-d-scie of 
the Jarve-limace, and to which he refers the Tenthredo cerasi, L. 
it is black, with blackish wings and brown feet. The larva is 
extremely common on the leaves of various fruit-trees in the 
gardens of France. On account of its form, Reaumur called it 
Fausse Chemille Tétard. It is entirely black, and covered with 
a glutinous humour, which has also caused it to be compared to 
a Snail. 
M. Peck, an American botanist, has also furnished us with 
(1) For the other species, see the authors just quoted. 
