684 



MK. B. F. CUMMINGS ON LICE 



complex in structure, consisting of an oval end-sac — the true 

 vesicula seminalis — which leads by a narrow neck into a second 

 well-defined portion, for convenience of description called the 

 middle-sac. Farther, elongate reservoirs, elegantly flask-shaped, 



Text-figure 28. 



Lipeurus forficulatus. Male reproductive system and copulatory apparatus. 



X 105. 

 a. seen from above; h. seen from the side. Testes 7iot shown. 



BF. basal plate. P. fused parameres. D. ductus. Fl. strip of narrow chitin 

 along ventral sui-face. 8. extrusible sac. B,. reservoir. JE. end-sac of vesicula 

 seminalis. M. middle-sac. AGr. accessory gland. Fa. cone-shaped papilla. 

 V. vas deferens. 



When in situ the vesicula and associated parts lie much further forward in the 

 body-cavity in front of the basal plate, and the sac when extended in copulation 

 curls over the back of the abdomen. 



