EXTERNAL CHARACTERS 153 



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 jaivs. 



II. EXTERNAL CHARACTERS. 



Kill the animal by pouring two or three drops of chloroform 

 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 con- 

 nects 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 backwards 

 beneath the thorax. 



a. The epicranium covers the dorsal and posterior sur- 



faces 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 

 fenestrae. 



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 ' upper ' lip. 



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



covering the sides of the head, behind and below 

 the eyes. 



e. The eyes are large black reniform elevations, one 



on each side of the head. They are compound, 

 each having very numerous hexagonal facets. 



f. The fenestrae are a pair of small white oval patche 



to the inner sides of the bases of the antennae. 



