Sri 



on its ^surface. Ihe trochitiiter i.s of comvspondiug size and lius one 

 hair ou the outer surface. The femur is widest at the base, and 

 gradually decreases until at the apex it is only one half the size. 

 The tibia is of uniform width, is longer than the femur and both 

 are equally distributed over with flexible hairs. The tarsus is one 

 lialf the length of the tibia without the claw, from the tibia it 

 gradually tapers and is more thickly covered with hairs, and the 

 elaw Avhicli terminates the tarsus is single and strong. 



The abdomen occupies a trifle over one half of the entire insect 

 and consists of nine segments, they decrease gradually. The vulva 

 is oval, Fig. XIX, and surrounded by a narrow cliitinous band 

 with Ave or six long strong spines and numerous small perforations. 

 In the figure the sixth spine is removed, the circular base present, 

 surrounding the vulva and band, have also many small perfo- 

 rations and less strong spines. I feel quite sure tliat the secretion 

 peculiar to the female comes largely from these pores about the vulva, 

 and in less quantities from the pores on the body. 



Habits. As soon as the males and females liave united, the latter, 

 if not already settled on tlie underside of the leaf, at once do so. 

 Care is taken by the insects that not more than three or four remain 

 on one leaf. As soon as settled the setae are inserted under the 

 epidermis of the leaf and the position of the insect is determined for 

 life. Thev make no particular choice on the leaf, and if they have a 

 preference it is for the portion l)etwoen the midrib of the leaf and the 

 next rib in size. 



The direction of tlie head is also immaterial with the insect. 

 Soon after settling the dorsal integument is covered with a white 

 substance and is equally distributed over the body. The insect also 

 increases in thickness. In a few days tlie secretion becomes greater 

 posteriorly and the insect is soon concealed from view. This secre- 

 tion does not assume a regular form but is loosely formed and flatu- 

 lent.' The eggs as soon as laid become enveloped in the mass, and as 

 the number of eggs increase, the quantity of secretion increases and 

 those eggs first laid are pushed outward by the pressure of the others. 

 Tlie e^gs form more rapidly in the body of the female than can be 

 deposited, and thus the ])ody becomes greatly distended. AYith the 

 development of the body the female pushes the setae under the epider- 

 mis until the head is in close contact with the leaf, and when raised 

 this organ will support the leaf on which it is situated. The white 

 secretion is eo.nposcd of a number of fine threads which are 



