Thorax in winged Insects. 179 
Fig. I. Sketch of a profile view of the Mesothorax and Metathorax of 
an Hymenopterous Insect. 
N.B. The line marked thus ~~~ denotes the division between 
the Mesothorax and Metathorax. 
Fig. II. Outline of the Tergum of an Hymenopterous Insect as seen 
externally and in a front view. 
Fig. Il]. Tergum of Prothorax in Polistes Billardieri, Fab. 
* Front view seen a little obliquely. 
+ Side view. 
Fig. IV. Tergum of Mesothorax in Polistes Billardiert, Fab. 
* Front view, which shews vestiges of the sutures which 
separate the Parapsides from the Scutum. 
+ Side view. 
Fig. V. Tergum of Metathorax in Polistes Billardieri, Fab. 
* Front view. 
+ Side view of the whole of the Metathorax. 
Fig. VI. Scutum of Metathorax in the same insect, 
Fig. VII. Termination of Metathorax to shew the four different apertures, 
viz. the Trochlea, the Articulation of the Abdomen, and the 
Sockets of the two posterior Legs. 
Fig. VIII. Pectus of the Prothorax in Polistes Billardieri, Fab. 
* Front view with parts separated. 
+ Side view with the parts separated. 
Fig. IX. Pectus of the Mesothorax in Polistes Billardiert, Fab. 
* Front view with the parts separated. 
+ Side view with the parts separated. 
Fig. X. Pectus of the Metathorax in the same insect, front view. 
Arr. XXVII. Additional Notice on the Genus Capromys of 
Desmarest. By W. S. MacLeay, Esq., M.A., F.L.S., 
&c. 
In my Paper on the genus Capromys of Desmarest, there are two 
typographical mistakes; the Spanish name for the troublesome Pulex 
M 2 
