BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
EXPLANATION 
OF THE PLATES. 
All the drawings were made, free-hand, from paraffin sections 6.6 4 thick. Un- 
less otherwise stated, the specimens were stained upon the slide for about twenty 
minutes in Kleinenberg’s alcoholic hematoxylin, and mounted in xylol balsam. 
a 
re . frm. 
elm. 
cta. 
cta.’ 
cta.” 
cla. al. 
Sbr. Wdrm. 
WVdrm. 
lewey. 
lew cy.” 
ABBREVIATIONS. 
anterior. 
formative 
scales. 
chitinous pillars found in 
scales. 
outer chitinous cuticula of 
the /arva. 
outer chitinous 
of the pupa. 
inner cuticula membrane 
of pupa. 
wing membrane. 
hy podermal fibres of pupal 
wings. 
hypodermis. 
leucocytes. 
vacuolated leucocytes as 
found in the very young 
pupe. 
cells of the 
cuticula 
lewey.”” 
mbr. ba. 
mbr. m. 
mbr. pr. 
ni. 
p- 
pre. 
Sq. 
tb. 
ie 
elongated spindle-shaped 
leucocytes. 
basement membrane of the 
larval hypodermis. 
middle membrane of the 
larval wings. 
Grundmembran of Sem- 
per. 
nuclei of the stellate cells 
that secrete the Grund- 
membran. 
posterior. 
processes of young hypo- 
dermis cells. 
scale. 
tubes produced from the 
newly formed Grund- 
membran. 
trachea. 
