264 



MR. B. F. CUMMINGS ON 



each segment. On each pleurite are two hairs ; those on seg- 

 ments 7 and 8 are very long. On the terminal segment, which 

 is without pleurites or spiracles, there is on each side a single 

 elongate bristle. 



Text-figure 12. 



Polyplax o.vyrrhynchns. Larva, Stage III. X 7i'o. 



The pleurites are small quadrilateral plates, attached along 

 their anterior margin to the lower margin of the spiracle. 



