ON THF SCALF INSECT OF MULP.F.RRV TRFFS. TI5 



The extended rostral setae are comparatively long, measuring 

 0,47 mm. in length, and are yellow in color. The body is covered 

 with sparse fine hairs, and its form as well as the antenna;, 

 legs, the two processes and bristles on the last segment, is similar 

 to those of the previous stage, the only difference being the in- 

 creased size. The chief characteristic in this stage is the 

 presence of two small openings (secretory pores) dorsally on the 

 space between the two simple eyes (Fig. 13. PI. II.). These 

 openings lie at the end of a short chitinous tube embedded with- 

 in the body, and from each of the openings, is spun out a sticky 

 continuous silky thread which covers loosely the hinder portion 

 of the larval body. When the threads are thus spun out, they 

 dry up by exposure to the air, and the mucous envelope (?) of the 

 threads is peeled off in a form of small hemispherical pieces, 

 which present the appearance of white dust on the posterior 

 portion of the larvae (Fig. 15, 15, a. PI. II.). On either side 

 of the mouth region, that is, at the base of the secretory pores, 

 there may be seen through the skin a concentrically coiled 

 thread, which seems to be of the same nature as silky thread 

 spun out of the secretory pores. 



The spiracles (Fig. 14. sp. PI. II.) are simple and small open- 

 ings. One pair of them opens ventrally on the first and third 

 segments of the body. In this stage, it seems there is still no 

 distinction between male and female larvae. 



Some days after the larvae have attached themselves to the 

 bark, they moult again and change to either male or female pupa-. 

 At the time of moulting, the skin of the larvae splits up lengthwise 

 on the ventral side, and there comes out a pupa, which remains 

 still for some time beneath the moulted skin, while later the body 

 of the pupa protrudes posteriorly from the moulted skin. 



The male pupa is oval, somewhat depressed, sac-like in 

 form, measuring 0,5 mm. and 0,3 mm. in length and breadth, 

 and has a light greenish yellow color (Fig. 16, 16, a. PI. II.). 

 It has no limbs or even the rudiments of wings; but the pos- 

 terior portion of the body is marked with some transverse lines 

 showing a number of segments. The three regions of the body 

 are not distinct. The two pairs of dark reddish brown ru- 

 dimentary eyes lie near the front edge of the body, and still 

 anteriorly on the ventral surface of the same, there is projected 



