ILYMENOPTERA. — TENTHREDINIDA 97 
changing in appearance after the last moulting. The larve of the 
different genera vary in the number of the legs. Those which have 
been observed with sufficient accuracy may be thus arranged. 
Larve with the extremity of the body not armed with a spine : — 
A. Larve with 22 legs (6 pectoral, 14 abdominal, and 2 caudal). 
a. Feeding upon the leaves of plants. 
Solitary, resting in a spiral manner, ejecting a fluid from the pores of the 
body ; forming a cocoon. ( Cimbex, Trichiosoma, Clavellaria.) 
Solitary or social, not ejecting a fluid from the sides of the body ; forming, 
or not forming, a cocoon. ( Tenthredo, Athalia, and certain Allanti, and 
Dolerus. ) 
b. Feeding upon the leaflets of the pine, social, not ejecting a fluid from the 
sides of the body ; quiescent, attached by the legs to the edges of the leaf- 
lets; forming a cocoon. (Lophyrus.) 
B. Larve with 20 legs (6 pectoral, 12 abdominal, and 2 caudal). 
a. Feeding upon the leaves of plants; resting at the edges, or upon the surface 
of leaves. (Hylotoma atrata, &e., Cladius, Pristiphora, Nematus, Cresus, 
and certain Yenthredines {likewise Zareaz and Abia, according to St. Far- 
geau ]. ) 
b. Feeding upon the leaflets of the pine, social ; resting at the edge of the leaf- 
let; forming a simple cocoon. (Nematus abietinus and Leachii.) 
e. Living in the galls of plants. (Nematus intercus, &c. ) 
€. Larve with 18 legs (6 pectoral, 10 abdominal, and 2 caudal). Hylotoma enodis. 
D. Larve with only 6 pectoral legs. (Lyda [and Xiphydria, according to Dahlbom, 
but see infra] Cephus. ) 
This table is abstracted (with additions), from Dahlbom’s Synopsis 
Larvarum Scandinavicarum eruciformium ex ordine Hymenopterum, 
contained in the work above noticed; in which Dr. Dahibom has given 
careful descriptions of 63 species of larvee belonging to this family. 
Dr. Hartig has also entered into considerable details relative to the 
transformations of the different genera, in his Die Blattwespen, Sc., 
a work which, for minute and careful investigation into the structure 
and habits of these species, in all their states, may be considered as 
one of the most excellent entomological works hitherto published. 
Geedart, Réaumur, and De Geer, published figures of many species 
in their different states, but those of the two former authors are often 
too rude to be determined. (See also Bergman, in the Stockholm 
Transactions for 1763, and in those of the Acad. of Upsal for 1767 ; 
likewise Disderi, in Transactions Turin Acad. vol. ii., on the larvee of 
this family.) 
The larvee of the larger species (Cimbex, &c.) have twenty-two 
feet, the body being covered with minute granular setigerous tubercles, 
like those of some of the Smerinthi, and, when alarmed, they dis- 
VOL. Il. H 
