( xix ) 



changes to a pure white pupa, the dorsal hump disappears, 

 and in its place a large fleshy process is evolved at each side, 

 terminated with a brush of strong spines. A similar but 

 much smaller pair appears on the 1st, 2nd, 3rd and 4th seg- 

 ments, each process diverging outwards, the brushes of stiff 

 hairs giving a firm hold, and in this trussed position the pupa 

 rests safe from contact with the sand. 



" In less than a week the limbs become suffused with a 

 delicate tint of gi-een, which increases in intensity until the 

 legs are distinctly visible under the pellicle. The mandibles 

 as well as the eyes are brown. At the end of four weeks 

 the pupa becomes restive. At last it turns over, frees itself 

 of the membrane enveloping its whole body, and there appears 

 a very delicate-looking Tiger Beetle, but so weak that it can- 

 not bear its own weight. In a day or two it attains its full 

 colour and character. 



" After this it quietly rests in a semi-toi^pid condition until 

 the following April, when it sets out for the small shaft left 

 by the larva as a final instruction. This it proceeds to enlai'ge 

 by biting the sand, which it removes grain by grain until its 

 labour is ended, and it reaches the surface." 



A discussion followed as to how far the abundance of food 

 in the larval state affects the development of insects, in which 

 the President, Mr. W. E. Sharp, and other Fellows took 

 part. Mr. Enock said that where the food supply happened to 

 be insuflficient, neuropterous nymphs would continue two years 

 in that stage, and j\Ir. C. O. Waterhouse mentioned a case 

 reported to him of the larva; of Vanessa urticx which, having 

 exhausted their summer pabulum, retired to hibernate until 

 the following year. Mr. A. J. Chittt said he had observed 

 that some coleopterous larviB under similar circumstances would 

 consume flies ; while Mr. H. St. Donisthorpe mentioned that 

 he had bred successfully a species of the same order on paper. 



