HYMENOPTERA. — UROCERIDE. 121 
character of the Tenthredinide). On the other hand, each of the 
four basal tarsal joints is furnished beneath with ¢éwo smail pulvilli; in 
which respect they differ from all the other allied genera; although 
Latreille and Klug are silent as to the pulvilli, and Hartig states, 
“ patellen fehlen” (p. 369.), which is the character of Urocerus. The 
structure of the ovipositor (terebra) is also precisely similar to that of 
Urocerus, and is correctly represented by Hartig * (pl. 8. figs. 13, 14, 
15.). The females deposit their eggs in standing trees, in which 
occupation I detected a specimen of X. Camelus in the Jardin des 
Plantes. 
In 1827, A. Cooper, Esq., R.A., communicated to me the larva and 
pupa of X. Dromedarius, which he had discovered in willow trees. I 
have represented the larva at fig. 72. 7.: it greatly resembles that of 
Urocerus; having six minute exarticulate thoracic legs, and a horny 
point at the tail. For various further details and figures of this insect 
I must refer to a separate memoir prepared at the period above men- 
tioned, and noticed in the Zool. Journ., No. 10. (1827), but not yet 
published. 
The genus Oryssus Latr. ( fig.73. 1. Oryssus coronatus ¢ ) is also 
Fig. 73. 

exceedingly interesting in respect to its anomalous structure. The 
jaws are robust, like those of Urocerus; the maxillae and labium 
nearly similar to those of Xiphydria, the labium ( fg. 73. 3.) being 
entire, but with two slight lateral impressions ; the maxillary palpi are 
long and 5-jointed (fig. 73. 2.) ; the antenne are simple, and com- 
. 
* Klug and Latreille are silent as to the composition of this organ, but St. Far- 
geau incorrectly states under Xiphydria, “ oviductorii fabrica eadem ac in Tenthre- 
dinetis, usus idem.” — (Monogr. Tenthr. p. 2.) 
