122 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XVI. 



needles of these trees, pupating some time in July. The larva? are bright- 

 green in colour and about an inch or a little over in length. When 

 feeding they take up a very characteristic position, which greatly aids in 



* d 



Fig, 40. — Dehra rose leaf Saw-fly, a, larva on a rose leaf; b, cccoon attached to 

 stem ; c, pupa ; d, imago ; e, leaf with empty cocoons from which 

 flies have issued. (Dehra Dun.) 

 their recognition, for they coil the lower end of the body round the leaf 

 upon which they are feeding. When full grown they change to pups 

 within small light-brown elliptical cocoons, the covering of which is 

 of parchment-like consistency, which they attach to a needle. In the 

 case of the silver fir saw-fly the larva pupates at the beginning of July, 

 the mature fly issuing about the middle of the month. These conif- 

 erous saw-flies require careful study, as it is probable that they will 

 play a not unimportant role in the forests as their management be- 

 comes more intense. 



Almost every year a plague of green saw-flies make their appearance 

 in the autumn on rose bushes in Dehra Dun gardens and entirely 

 strip many bushes of their leaves. This year (1904) it was possible 

 to obtain the flies in thousands from the innumerable larvse upon 

 the rose trees. The caterpillars spend about two weeks in this stage 

 and 4 — 6 days as pupse. The pupa is enclosed in a cocoon attached 

 to the leaf. The flies on issuing apparently pair and lay eggs almost 

 immediately. Fig. 40 shows the larva, cocoon, pupa and fly of 

 this pest. 



II.— Hymenoptera Petiolata. 



The hind body is connected with the thorax by means of a deep 

 constriction, so that there appears to bo a stalk between it and the 



