128 ON THE CATERPILLARS 



serve at once to distinguish these Emciform Tenthredinideous 

 larvae, from the larvae of Lepidopterous insects. 



The Emciform larvae of the The true caterpillars have — 

 saw-flies have — 



Two distinct ocelli ; one at Twelve ocelli ; six arranged 



each side of the head ; in a semicircle on each 



prolegs simple ; some- side of the head ; prolegs 



times as many as 8 pairs furnished with a circle 



(never, when the prolegs of minute hooks ; never 



are present at all, with with more than 5 pairs, 

 less than 6 pairs). 



II. I now proceed to give a more detailed account of a few 

 of the species of these larvae, which, from the similarity of 

 their habits to those of different species of Lepidojrtera, 

 may be supposed to possess a greater degree of interest than 

 the rest. 



One of the larger species of this family, Trichiosoma 

 lucorum, is by no means rare, and is more especially worthy 

 of notice from the fact, that its cocoon is often mistaken for 

 that of an eggar moth, being hard, brown, oval and fixed to 

 the twigs of whitethorn hedges ; so that, during the winter, 

 when the leaves are fallen from the trees, it is very con- 

 spicuous. 



This and the larvae of the other large species, constituting 

 the sub-family Cimbicides, have six jointed and 16 (8 pairs 

 of) fleshy prolegs, fourteen being ventral and two anal ; 

 they feed upon the leaves of plants, they are solitary in 

 their habits, rolling themselves up into a spiral flattenend 

 coil when at rest, and emitting a viscid, scentless fluid, 

 when alarmed, from the numerous lateral pores on the sides 

 of the body. The larvae of the Trichiosoma lucorum may 

 be met with on the whitethorn, at the end of June and in 



