77 



hatched pass down the stem and seek food from some uninhabited 

 leaf. After fifteen or twenty da3-s, the insects have increased their 

 size two fold, the body has accumulated a quantity of food, globulesic 

 adipose tissue, until its thickness has also increased and the 

 two setae are coiled spirally on each side of the head. There is 

 nothing by which a moult can be determined at this time, yet 

 the general appearance of the insect is changed. This is more par- 

 ticularly true of the female larvae. The spines upon the integu- 

 ment have become stronger, and from each segment at the side 

 from three to five strong spines project, while the hairs except from 

 about the head and anus are more rare. 



The head is less rounded, and from between the eyes thirteen 

 hairs of an unequal length project, and in addition to these are 

 four quite strong spines. The fissure of the last segment has be- 

 come deeper and the central part thickened. The hairs projecting 

 from the sides of the fissure are both longer and stronger. From 

 the division of the last two segments, two long spinous hairs extend 

 below the bod}', and from the lobes strong spines and numerous 

 pores are scattered irregularly over the surface. 



The antennae have also gained one joint more and now present 

 seven. Fig. X., the last article shorter than in the newly hatched 

 larva. The legs liave increased in strength, and the tarsi become 

 shorter while the tibia lengthens. 



With the red or male larvae there is less change, the body has be- 

 come narrower and longer, and no apparent change has taken place 

 with the posterior portion. The white coating has not increased in 

 quantity and the color of the insect can at once be determined, 

 THE MALE PUPA. 



Soon after birth, the sex of Fsexiclococcus aceris can be deter- 

 mined by the difference in color ; the females retaining the yellow 

 color throughout their entire existence, while the males as decidedly 

 retain the red color. They change slightly in structure and the 

 number of articles in the antennae remain the same. They soon be- 

 come restless and wander aimlessly about over leaf and limb, they 

 are met by the young females, who partake also of their restlessness 

 and together they Avander about over the trunk and the limbs of the 

 tree for from seven to ten days, when the females return to the leaves 

 and the red males secrete themselves underneath the roughened out- 

 side bark of the tree and undergo their transformation to the imago. 

 A limited number of them return to the leaves and change thereon. 

 From the spiijes and pores of the integument of tlie body issues a 



