170 THE COCKROACH. 



I. HABITS. 



Watch the living animal in a glass vessel, noting especially 

 the positions of its legs and head ; also the mode of using the 

 long antenna?,, and the maxillary and labial palps. 



Watch the respiratory movements of the abdomen. Feed 

 with sopped bread, and watch the lateral movement of the 

 jaws. 



II. EXTERNAL CHARACTERS. 



Kill the animal by pouring two or three drops of chloro- 

 form upon it. 



A. The Body. 



The body is divided into head, thorax, and abdomen, each 

 of which is composed of several segments. A small neck 

 connects the head with the thorax. 



1. The head is broad from side to side, and short from 

 before backwards, and is produced downwards into 

 a broad process bearing the jaws. Owing to its 

 shortness and vertical elongation, it has a deceptive 

 appearance of being bent downwards and back- 

 wards beneath the thorax. 



a. The epicranium covers the dorsal and posterior 



surfaces of the head. It is divided into right 

 and left halves by a median suture which divides 

 in front into two, running obliquely outwards to 

 the fenestra (p. 171). 



b. The clypeus is a broad plate covering the front of 



the head, below the epicranium. 



c. The labrum is a smaller plate hinged to the lower 



edge of the clypeus, and forming the anterior or 

 1 upper ' Up. 



d. The gense, or ' cheeks,' are a pair of vertical 



plates covering the sides of the head, behind 

 and below the eyes. 



