76 



THE COCKROACH 



but the 8th and 9th terga are reduced to narrow bands of 

 chitin, overlapped and concealed by the posterior margin of 

 the 7th tergum as in the female. The 10th tergum is a flat 

 rounded plate, projecting beyond the posterior margin of the 



Fig. 24. — The Cockroach (Periplaneta americana). Male ( x IJ). 



body, with a notch in its posterior margin. Under it lie the 

 podical plates and the anus as in the female. 



The anal cerci, occurring in both sexes, are a pair of spindle- 

 shaped, many-jointed appendages projecting beneath the 

 edge of the 10th tergum. The anal styles, occurring in the 

 male only, are attached to the sternum of the 9tli segment. 

 (See Fig. 27, A.) 



(ii) A ventral view showing the position of the head with its appendages, 

 and also the attachments of the legs as described above, the anal cerci 

 (and styles in the male) and the opening of the anus. 



Notice the stigmata or respiratory openings (twenty pairs) on the sides 

 of the body, between the thoracic segments and on the first eight abdominal 

 segments (between the tergum and sternum, and at the front end of each 

 segment). 



