BUTTERFLIES. 293 



when full grown is over 2 inches long and olive green 

 in colour, with flecks of darker green and white and 

 a patch of white on the head. It has a retractile 

 magenta-coloured forked tentacle near the head and, 

 when extended, this emits a curious odour suggestive 

 of decayed citrus fruit. The larvge are often para- 

 sitised. 



The pupa is erect and girdled; it is pale green, 

 fawn, or brown. If obtained up to late summer the 

 adult emerges, but if later than March it usually 

 remains as a pupa all winter and as late as Novem- 

 ber. 



A smaller type and resembling the former is an- 

 other orchard swallowtail, Papilio anactus or *' dingy 

 swallowtail." The fore wings are of a smoky brown 

 colour, with patches of white : it has the same num- 

 ber of red lunules on the wings as those of 

 aegeus. The larva is a bronze green in colour, 

 flecked with pale blue and yellow. Food plant: 

 citrus trees, chiefly lemon. We obtained several 

 pupae. The pupation of these larvae, which in 

 summer takes about an hour, may take two or 

 three days in the winter. So slow was it that 

 we thought some of our larvae were dead. After 

 the end of the body was secured by the patch 

 of threads and the girdle formed, the caterpillar 

 hung in this way for two days, when the larval skin 

 burst and was pushed off. We made observations 

 on about a dozen in all; two made no girdles, but 

 just hung downwards, suspended by the tail. 



^*The blue fanny'' {Papilio sarpedon) is a very 

 pretty black butterfly with the central portion of 

 wings a bright turquoise blue. 



