ON THE EMERGENCE OF LISTRODROMUS QUINQUEGUTTATUS, GRAV. 187 
of a somewhat more sordid colour than are the head, wings, and 
abdomen. ‘There is no trace of lateral abdominal spiracles, and those 
of the butterfly’s pupa, in which the parasite’s ecdysis takes place, are, 
like the whole interior of the chrysalis, thickly covered with a silky 
coating, which would indicate a somewhat incomplete respiratory 
system. Its length is 7mm. Shortly before emergence the imago can 
easily be traced, since most of the markings, and especially the flavous 
outer-orbital, are plainly visible. The pale marking on the three 
basal segments is, however, not represented. The tumidulous post- 
petiole is, nevertheless, very distinct, though the antenne, palpi, face, 
and wings are still enveloped in their white covering ; the first of these 
are flavous throughout at this stage, excepting the scape, which is 
piceous. The abdomen has now undergone considerable modifications, 
and its contour is quite changed. Nearly all the imaginal colouring is 
present, excepting those points already noticed. 
As far as [am at present aware, Listrodromus quinqueguttatus con-. 
fines its parasitism to Cyaniris argiolus, since it has been thence bred 
by Marshall in August, from larve on Syringa in July (ef. Hut. Mo. 
May., xxxiil., 285), by Bignell, and, quite recently, by Mrs. Redmayne 
(anted, p. 164), and Mr. Prideaux. 
Pura oF ListRopRoMUS QUINQUEGUTTATUS, GRav., ae 
Fig. 1 represents the pupa, and Fig. 2 the abdomen, shortly 
before emergence. 
There was no trace outwardly of any emergence at 12. noon—at 2.0 
p-m. however, I heard a gnawing noise which could be distinguished at 
the other end of the room; it was similar, though scarcely as loud, as that 
produced by Trichiosoma when emerging.—This continued intermittently 
till 4.0 p.m., when I found an irregular, jagged hole had been effected 
through the C. aryiolus pupa, at about the apical third, through which 
the flavous orbits of the parasite were plainly visible.—At 4.80 p.m., 
the hole was much enlarged, and both antenne protruded.—At5.15 p.m., 
the two front legs and the head were through it, and the insect was 
furiously struggling to lever up the cap, which had been (apparently) 
insufficiently cut round, with its prothorax, and biting the shell about 
its mouth, with occasional rests of a few seconds’ duration.—At 5.30 p.m. 
this was continued, and several attempts were made to bring the man- 
dibles on to the cap, but, these proving futile, the shell upon the breast 
continued to be demolished.—At 5.40 p.m., I raised the operculum, 
fearing the struggle for freedom might be lasting too long for the 
