on varius Species of Hymenopterous Insects. 133 
to the family Uroceride ; and if we recollect that Latreille admits 
into the family, without any expression of doubt, the genus Orys- 
sus, which certainly differs from Urocerus in a much greater degree 
than Xiphydria, (although between the males of the latter genus 
and of Oryssus there is a very considerable resemblance, ) I think 
there will remain little in favour of Xiphydria being placed at a 
distance from Urocerus, and as constituting a part of the family of 
the saw-flies, or as forming of itself the type of a separate family. 
DESCRIPTION OF THE FIGURES. 
Note.—The figures are more or less magnified, except where stated to the contrary. 
Plate X. fig. 1. The larva making its way through the branch of willow, of the 
natural size. 
2. The larva in the position in which it is generally at rest, and 
laying upon its side. 
3. The larva stretched out, seen as when in motion. 
4. The underside of the anterior segments of the larva, showing 
the position of the six feet. 
5. One of the fleshy feet magnified. 
6. The last segment of the body of the larva, upper side. 
7. Do. under side. 
8. Do. seen laterally ; aa, the coronet of minute spines ; bbb, the 
parts of which the apical spine is composed ; ccc, portion 
of the segment. 
9. The head of the larva seen from the front; aa, the rudiments 
of the antennae; b, the upper lip; cc, the upper jaws; dd, 
the lower jaws ; e, the lower lip. 
10. The rudimental antenna, much magnified. 
11. The upper jaw, do. 
12. The lower jaws and lower lip of the larva; aa, the outer jointed 
part ; 6b, the ciliated interior part; e, the lip. 
13. The lower jaw, more highly magnified. 
14. A female pupa nearly ready to assume the perfect state. 
15. A male pupa withered shortly after assuming that state. 
P.S.—The parasitism of the genus Urocerus (Sirex), as suggested 
by the Baron de Geer, alluded to above,* has received another 
supposed confirmation in a memoir recently published by the 
Marquis Spinola, entitled ‘“‘ Considerazioni sopra i costumi degl’ 
Imenotteri del G. Strex, Fab. e sopra il miglior posto dei Sire- 
citi nel metodo rationale ;” + in which, after noticing the various 
* The Count St. Fargeau (Encyc. Méth, t. x. p. 770, and Hist. Nat. Ins. Hym. 
t. 1. p. 5, note 3,) has reaffirmed the parasitism of Urocerus, 
+ Genova, 1843. 8vo. 
