11 
Part VII] Beeson: Life History of Toon Borer. 
4. The Pupa. 
[Plate III, Figs. 1, 2, 3.] 
Technical Description. From numerous specimens collected in 
the Delira Dun district. The terminology of Mosher, 1916, “ A classi¬ 
fication of the lepidoptera based on the characters of the pupa ” has 
been followed throughout. 
Colour. The freshly formed pupa is light bluish-green in colour, 
the subsequent changes are passed in the following order :—Greenish- 
yellow, yellowish-brown, bright reddish-brown to dark chestnut brown ; 
the full coloration is acquired within 24 hours. 
Form. Elongate cylindrical, rounded at cephalic end, bluntly 
tapering at caudal end. 
Median head regions , i.e., vertex+front-}-clypeus, not separable, 
no epicranial suture ; fronto-clypeal suture extending mesad for a short 
distance, (less than the length of the base of the antenna). 
Antennae (a) long extending to level of anterior margin of 4th segment, 
distal ends separated by maxillae and 2nd and 3rd legs. 
Labrum (1) subcordate, acutely angulatein middle of anterior border. 
Pilifers (pf) prominent, rounded, approximate medianly. 
Labial palps (lp) concealed by maxillae except for a small cuneate 
piece just caudad of the pilifers. 
Eye pieces (ep) not easily separable from genae except in mature 
pupa ; glazed eyepiece lunate, sculptured eyepiece smaller, triangular. 
Maxillce (mx) broad at base but rapidly narrowing in basal fifth, 
extending to near middle of 4th abdominal segment but not reaching 
to caudal margin of wings. 
Maonllary palps (mxp) sub rectangular, extending as far as the 
proximo-lateral angle of the maxilla). 
Thorax. Pronotal area , (pt) transverse, anterior border concave, 
posterior border sinuate, median line carinate, lateral angles obtusely 
rounded. 
Mesonotum, (mst) more than twice as long as pronotum, posterior 
border deeply concave, median line carinate. 
Mesothoracic spiracle (msp)* situate at the caudo-lateral angle of 
the pronotum, margins elevate, caudal margin transverse. 
Legs. First pair (1 2 ) adjacent to the maxillae at the proximal end, 
thence diverging and exposing a narrow fusiform portion of the 3rd 
pair, later rejoining the maxillae at about \ the length of the latter. 
Second pair, (1 2 ) exposed for their whole length and extending to the 
caudal margin of the wings. Third pair, (l g ) concealed except for a 
portion of the femur and the terminus of the tarsus. 
* Mesothoracic according to Mosher, 1016 ; prothoracic according to previous authors. 
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