126 Mr. J. O. Westwood’s Memoirs 
of lateral raised fleshy tubercles of the same length as the joint 
itself, which have somewhat the appearance of a row of white 
coral beads in miniature along each side of the body of the insect 
(see fig. 2 and 3). The last joint is larger than any of the eight 
preceding and is singularly formed, being flattened above with 
several impressed lines upon its surface and rounded underneath. 
It is also furnished at the apex with a short spine, composed of 
several pieces of various lengths soldered together (fig. 8 bbb) 
and arising from the centre of a coronet of very minute spines 
(fig. Saa). Of the duration of the insect in the larva state I 
can give no account. 
The economy therefore of this insect is not very dissimilar to 
that of Urocerus, the larvee of which resides in burrows in the 
solid wood of the fir; Mr. Marsham, in the tenth volume of the 
‘“‘ Linnean Transactions,” relating a lively anecdote of the alarm 
of a nurse and some children at the appearance of several speci- 
mens of Urocerus gigas, which came out of the deal floor of a 
newly boarded room. 
But it is not in economy alone that this similarity is perceivable, 
for if we examine the figure of the larva of Urocerus, given in 
the eighteenth plate of the “ Introduction to Entomology,” or its 
description as given by Klug in his admirable Monograph on 
the genus Urocerus, we shall not be able to find any material 
difference. He describes it as being ‘ Mollis, cylindrica; seg- 
mentis tredecim equalibus, ultimo excepto majori rotundato, 
pluries plicato spina parva terminali parva instructa; capite sub- 
globoso, parvo, mandibulis exigius armato; pedibus sex segmentis 
tribus prioribus infixis. Pupa folliculata, quiescens, imagini 
simillima alarum tantum rudimentis. Victus larve ex arborum 
ligno.”’* 
With regard to the larvee of other Hymenoptera the nearest 
approach to that of Xiphydria is made by the Tenthredinideous 
genus Lyda, the larva of which entirely loses the prolegs (although 
so peculiar a character of that family, but which nevertheless vary 
in number in the different genera). ‘There is also another character 
which the larva of the Uroceride possess in common with those of 
the Tenthredinide, namely, that of having the rudiments of all the 
parts of the mouth of a mandibulated insect perfectly distinct, a 
character which no other Hymenopterous larve possess in so great 
a state of development. Nevertheless, as I have above stated, in 
the motion of the larvae of Xiphydria, a considerable agreement is 
* Monogr, Siric. German, p. 25. 
