I 



the Life History of Agriades thersites. 303 



domcn and the wing colours being evident. The incisions 

 behind abdominal segments 2, 3, 4, 5, 6, and 7 were ex- 

 tended, the last not quite so evidently as the others. This 

 extension is no doubt achieved by inflation of some internal 

 spaces with air. The pupa was stimulated by placing it 

 in the sun and at 12.10 the mesothorax slit down the back 

 and some blue hairs, apparently quite dry, appeared. 

 These showed some jerky movements as if the insect were 

 trying to flutter its wings, but no sign of peristaltic move- 

 ment was observed, the hairs of the abdomen maintaining 

 their positions within the pupa case quiescent and un- 

 changed. At 12.14 the prothorax was obviously slit, and 

 the line of hairs was rather wider, occasional fluttering 

 movements continued, and at 12.15 the head was free, the 

 dorsal slit not widening as in the emergence previously 

 observed, and the head freeing itself before the thorax had 

 made any very obvious advance, and whilst the terminal 

 segments had in no degree left the hinder segments of the 

 pupa. At 12.15 the legs were free and the insect had 

 quite left the pupa case at 12.17. Up till the freeing of 

 the legs, which then assisted the emergence, the process 

 seemed to be entirely by expansion of the bulk of the 

 insect and not as a result of segmental or peristaltic 

 movements ; more air being secreted inwardly, or that 

 already there expanding under increased temperature. 

 At 12.27 the wings were fully expanded. Some small 

 drops of turbid, but not thick fluid were expelled shortly 

 after emergence and again after the wings were expanded, 

 but there was no deposit in the pupa case, nor in any 

 other pupa examined. 



A (J emerged on March 3rd that varies by having the 

 spots beneath very weak, of the first discal row of hind- 

 wing, the 2nd is a mere dot, and the 4th and 5th (in white 

 dash) and the 7th and 8th are absent. (Fl. LI, fig. 1.) 



I had given up the pupa of this specimen as ill or dead 

 some days previously. Several days before, when the 

 wings were in the ivory stage, one wing-base, about a 

 fourth of the wing, became nearly black, when one would 

 have expected both wings to become so all over in ordinary 

 course, and things remained so for at least two days, and 

 the blackness was attributed to one of the fatal disorders 

 with such change of colour beginning at one place, to 

 which larvae and pupae of Lycaenids are liable ; then quite 

 the wing-base on the other side became black, and next 



