678 Transactions. 
found to be identical, whereas that of N. fulva differed in pi of the prothorax 
being placed far caudad of the tau group, and rho in the abdominal ség- 
ments taking up a position behind and below epsilon, behind and level 
with the top of the spiracle. In all species beta is absent in the abdominal 
segments, and an extra minute seta appears above epsilon in the meta- 
orax. In searching for good specific characteristics the chaetotaxy 
of the tenth abdominal segment was found to offer a slight clue (see 
figs. 11-15), but the most marked specific characteristics were found in the 
clothing of the larval skin; these are shown and described in Plate 67. 
The presence of a minute sensory organ or puncture on the prothoracic 
shield (marked x in figs. 2 and 3) was found in all specimens. 
Camera-lucida sketches of the head-pieces were made, and appear in 
gs. 4-8; size and shape appear to be the best specific characteristics ; 
all in common have front narrowed caudad, lobes of epicranium extend- 
ing caudad to a considerable distance behind meeting-point of front and 
vertical triangle, and the single ocellus on either side. 
| The Cocoon. 
25mm. by 15mm. A small ovoid structure of fine white silk. 
Unlike the silk of the four species already dealt with, it does not change 
to brown on exposure to moisture. Cocoon constructed outside mine 
amidst foliage of food-plant, either in crevices in bark, in angles of branches, 
or between two leaves. Closely woven and surrounded by a fair amount 
of loose flossy silk, by which it is attached to its support. At anterior 
end is a prepared transverse slit, which is' kept closed by the loose silk. 
Construction occupies about three days. | 
The Pupa. (Fig. 23.) 
Female. Ventral aspect: Body roughly oval in outline, flattened dorso- 
