HYMENOPTERA. — TENTHREDINIDA. 107 
burg, 1821.) But the most complete account of the genus has been 
published by Hartig, in his Die Blattwespen, in which 17 species are 
described, with all the details of their economy and transformations. 
(See also Loschge, in Der Naturforscher, st. 22.) Mr. Dale, under 
the date of August 16., states, “ Lophyrus rufus ? bred, they all 
pupised on June 2., and they continued to breed [emerge from the 
cocoon ?] till September 16. (Mag. Nat. Hist. No. 25.) 
The larvee of the genus Lyda (Pamphilius ZLatr.) differ from those 
of the remainder of the family in being destitute of abdominal prolegs 
the body being termininated by two short points, beneath which are 
two longer articulated appendages, resembling the thoracic legs, but 
stretched backwards ( fig. 71. 12. larva of L. hypothropica Hartiq). 
These larvee reside in society in webs, upon several kinds of fruit trees, 
and upon firs, the leaves of which serve them for food; each larva, 
moreover, spins for itself a separate case, and the whole society 
are covered by a roof of leaves fastened together with silk. The 
motions of these larvee are curious and quite unlike those of the other 
species which are furnished with abdominal prolegs, having more of 
a sliding motion, and employing its powers of spinning silk for assisting 
its progress. When they descend from a leaf they let themselves 
down by a silken thread, after the manner of caterpillars. 
One of the species of this genus lives on the pear, and emits a black 
fluid from the mouth when alarmed. The larva of Lyda pratensis has 
formed the subject of a memoir by Hapf and Schwaegrichen (emer- 
kung. tiber den Afterraupenfrass, Sc. Bamberg and Aschaffenberg, 
1829), and that of L. erythrocephala has been described by Treviranus 
(in Verhandlungen des Vereins zur Beforderung des Gartenbaues, vol. ii.). 
The larva of Lyda sylvatica resides upon pear trees in a web; it is of 
a yellow colour with a black head, and is represented in the Entomol. 
Mag., vol.i. pl. 1. f.4. Hartig (pl. 9. f. 1—9.) has represented the 
larva and imago of another species (L. hypothropica) which feeds upon 
the pear. 
Another species of Lyda lives upon the aspens, the larva being 
solitary, and inhabiting the interior ofa leaf, which it rolls up into a 
case fastened together with silk. It makes no use of its legs in 
walking, but merely glides along by the contraction and elongation of 
of the segments of its body. For several years past I have observed 
one of the species of this genus (L. inanita, fig. 71. 9.) frequenting the 
garden of my residence at Hammersmith, and regularly making its 
