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. I 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 tho.se 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 larvae oi Xenos and Sty lops : probably 

 I have overlooked them. Neither have I been able to satisfy myself that the 

 young Stylops possesses even the slightest rudiments of antennae. 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 The head also is partially withdrawn 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 larvae of the Lampy- 

 ridce, 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 larvae which penetrate into 

 other bodies, as Silpha, Dermestes, Lampyris, &c. amongst the Carnivora, and 

 Cerambyx and other Xylophaga. 



The second segment, the prothorax, is the largest of the whole body, and 

 much resembles the corresponding part in other larvae. The third and fourth, 

 the meso- and mefa-thoradc 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. In 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 



