216 MR. A. MURRAY ON A NEW SPECIES [June 24, 
chus. It will be seen that the arrangement in C. frontatus is much 
nearer that in C. vulgaris than that in C. leptorhynchus, which is upon 
a totally different plan, the middle space in it being free from scuta, 
soft, and smooth, with transverse wrinkles or lines, while in the other 
two the space is covered with scuta, those in the middle being trans- 
verse. The commencement of these transverse scuta between the 
eyes is also different. 
The scuta on the nape of the neck are differently proportioned and 
placed in all three; and here the arrangement in C. frontatus bears 
most affinity to that of C. leptorhynchus, instead of to that of C. 
vulgaris. Fig. 10 shows this arrangement in C. frontatus ; fig. 11, 
Fig. 10. 
in C. vulgaris; and fig. 12, in C. leptorhynchus. In C. frontatus 
and C. leptorhynchus the four large scuta are of a subquadrate form ; 
in C. vulgaris they are irregularly subhexagonal. In the latter, not 
only these but also the scuta generally are flat, with a longitudinal 
