342 Mr. Newport on the Natural History 
eight bright points, which have the appearance of ocelli. These are arranged 
transversely on the front of the head, so that when the larva depresses this 
part, which it usually does towards the ventral surface, these bright points 
are directed forwards. 1 have been unable to determine whether these are, 
like the ocular tubercles of the Arachnida, real ocelli, or whether they are 
merely dermal tubercles, analogous to those which are developed into spines 
on the thoracic and abdominal segments; or whether, as there seems reason 
to suspect, the ocular and dermal tubercles are not identical in their mode of 
origin from distinct cells in the tegument, which differ only relatively, in the 
extent to which the development of the primary constituents of their nuclei 
and nucleoli are carried. I have not been able to detect the existence of the 
ocelli pointed out by Dr. Siebold in the larvee of Xenos and Stylops : probably 
I have overlooked them. Neither have I been able to satisfy myself that the 
young Stylops possesses even the slightest rudiments of antennze. The parts of 
the mouth I have seen exactly as described by Siebold ; but they are usually 
retracted and difficult to observe. The head also is partially withdrawn 
beneath the prothorax, somewhat as in the carnivorous larvæ of the Lampy- 
ride, and perhaps, as in them, the head and mandibles are extruded only at 
the moment of ‘attack on the prey. This retraction of the head and mouth 
beneath a shield-like. prothorax is common to larvee which penetrate into 
other bodies, as Silpha, Dermestes, Lampyris, &c. amongst the Carnivora, and 
Cerambyx and other Xylophaga. 
The second segment, the prothoraa, is the largest of the whole body, and 
much resembles the corresponding part in other larva. The third and fourth, 
the meso- and meta-thoracic segments, are shorter than the second, but are 
broader than the following abdominal ones. These three segments give 
attachment to the legs. The remaining ten segments constitute the abdo- 
minal region. Inm the living insect they are each longer than the meso- and 
meta-thoracic segments, excepting only the anal or terminal one. Each seg- 
ment is armed on its posterior margin with a row of spines. These are short 
on the thoracic segments, each alternate one being only half the length of the 
adjoining. On the abdominal segments their length is gradually increased, 
until those on the posterior measure one-third or nearly one-half of that of 
the segment. Instead of each alternate spine only being elongated, nearly 
