30 INSECTS AFFECTING THE ORANGE. 



sight. These scales resembled in appearance the fruiting organs of cer - 

 tain minute fungi. They were white, circular, convex, with a slightly 

 depressed ring round the central portion (Fig. 5d) ; their texture was 

 quite dense, and they were not firmly attached to either the insects or 

 the leaf, a slight touch being sufficient to remove them without disturb- 

 ing the larvae. The larvae had not changed in appearance, and were 

 able to move their legs and antennae. 



" April 15, the lice had not changed perceptibly. The scales had be- 

 come higher and more rounded. 



" April 16, the lice had contracted considerably, 'being now nearly cir- 

 cular, at least as broad as long; in other respects there was no apparent 

 change. The scales were found to vary somewhat 5 those most advanced 

 having the central portion covered with a loose mass of curled white 

 threads. (Fig. 5e.) 



" April 17, there was apparent no further change in the larva ; but the 

 mass of threads covering the central part of the scale was found in some 

 specimens to have greatly increased in size, equaling in height three or 

 four times the width of the scale. This mass is cottony in appearance, 

 and in those specimens where it is largest is more or less in the form of 

 a plate twisted into a close spiral (Fig. 5/). 



" April 19, not much change was apparent in the larva, but the mass of 

 cottony excretion upon some of the scales had increased enormously ; so 

 that in some cases it extended in a curve from the scale to a point five 

 times the width of the scale above the leaf and down to the leaf. 



"April 20, no important change was observed either in the Iarva3 or 

 scales. 



" April 21, it was observed that the larvae had become more or less 

 transparent, and marked with large irregular yellow spots near the 

 lateral margin of the head and thorax, and with a transverse row of 

 similar spots across the base of the abdomen ; the tip of the abdomen 

 is very faintly yellow. 



"April 22, no important change was noted. 



"April 23, it was observed that the scales appeared faintly reddish in 

 color with the center white; the reddish color, however, was due in part 

 to the body of the larva, which is now orange-red, showing through the 

 scale. It should be noted that in only a part of the specimens did the 

 cottony mass become enlarged as represented in Fig. 5/. The greater 

 part of the scales remained until this date Of the form shown in Fig. 5e, 

 and the cettony spirals have now disappeared, probably having been 

 blown away. 



"April 24, some of the larvae had become deep orange in color. 



"April 26, most of the scales had become deep orange in color with the 

 central part white ; some had at tke center a small nipple like protu- 

 berance; others still preserved a short tuft of a cottony excretion. 

 This tuft is either removed by wind or otherwise, or it becomes com- 



