May, 1916] Honiopterous Studies. Part II 313 



floor of the mouth into the thorax. Both pairs of ducts end 

 in glands, which are long structures, normally located in the 

 abdomen. Each gland is whitish, and rather narrow. The 

 salivary glands secrets the saliva which is carried forward into 

 the pump and thence into the sucking tube. 



THE THORAX. 



The structure of the thorax was not studied in any degree 

 of detail, and only reference to the more striking features will 

 here be made. As in a generalised insect the thorax is composed 

 of three segments, in order, the pro-, meso- and meta-thorax. 

 The prothorax has undergone considerable modification and 

 the traces of the sclerites seem to have been entirely lost. 

 The dorsum or tergum is the large piece on the dorsal surface; 

 it overlaps the mesonotum. Laterally the prothorax shows 

 little differentiation into episternum and epimeron. The 

 sternal region is reduced to a small piece, which bears the small 

 chitinous apophyses. At the sides the first pair of legs are 

 borne. The mesothorax is large and well developed, com- 

 prising a number of sclerites, which are separated with difficulty. 

 Laterally it bears the tegmina and beneath the second pair of 

 legs. The episternum and epimeron are easily recognised in 

 this segment. A noticeable feature of the mesothorax is the 

 great development of the musculature; the large wing muscles 

 are very prominent. The apophyses are strongly developed. 

 The metathorax is striking because of the great development 

 in size of the hind coxas ; the latter are supported by very strong 

 muscles. The sternal surface of the metathorax is almost 

 completely overshadowed by the large coxee. 



THE ABDOMEN. 



The Jassid abdomen is composed of at least eight segments, 

 of which the first seven bear spiracles. Each abdominal 

 segment is composed of a dorsal tergite and a ventral sternite, 

 the two being connected by pleural membranes. 



The modification of the posterior end of the abdomen for 

 reproductive purposes has brought about a reduction in the 

 number of apparent segments and many of these are recognised 

 with difficulty. In the female the last abdominal segment is 

 known as the pygofer (pyg.) ; through its dorsal region the anal 



