280 Bionomics of Weevils 



smaller bristles on each segment, one occurring on each side between 

 the dorsal and lateral bristles, another between the lateral bristles and 

 one beside the pleural bristle. The eighth segment bears only one 

 bristle-bearing pap on each side, the ninth terminates at each corner 

 in a large and prominent spinous process which is covered especially 

 posteriorly with numbers of minute pointed projections and bears on 

 either side a backwardly directed spine. The tenth segment is visible on 

 the ventral surface, between the spinous processes of the ninth segment. 

 It consists of two lobes, representing tergite or supra-anal lobe and 

 sternite or infra-anal lobe. The spiracles of the abdominal segments are 

 situated on the sides in the region of the pleural bristles. The femora 

 of the legs project prominently from the sides of the body, and each 

 one bears at its extremity a pair of conspicuous hooked and capitate 

 bristles. 



External Sexual Differences between the Male 

 and Female Pupae. 



The male and female pupae can be distinguished by examination of 

 the posterior abdominal segments. The tergites, pleurites and sternites 

 so clearly marked in the adult weevil can be traced in the pupae of both 

 sexes as areas separated by ridges or incised lines. The abdominal 

 tergites in the pupa comprise the region of the back occupied by the 

 dorsal and lateral spines; the epipleural region containing the spiracles 

 is indistinctly distinguished from the tergal region by an undulating 

 ridge more conspicuous on the posterior segments. It bears dorsally the. 

 pleural spines. The hypopleurites can be easily recognised as flat areas 

 on the sides below the epipleurites, and the ventral surface is occupied 

 by the sternites. The external sexual differences are to be found in the 

 shape of the seventh sternite and the eighth tergite. 



The Male. (Fig. 4, A and B.) 



The male pupa has the surface of the sternite of the seventh segment 

 flat or only very slightly rounded; its outline when viewed from the 

 side (Fig. 4, A) not projecting beyond the surface of the sternite of the 

 eighth segment. The posterior edge of the seventh sternite where it 

 meets the eighth sternite is almost quite straight and bluntly angulated 

 at the junction of the hypopleurite of each side (Fig. 4, B). The tergite 

 of the eighth segment is also longer and larger than in the female and 

 its surface is flatter. 



