36 LICHTENSIA Vi 



of the ovisac. The larvae liatch towards the end of 

 June, fixing themselves down on various parts of both 

 the upper and under sides of the leaves of the food- 

 plant. The earliest male to appear was on the 25th of 

 April, 1894, but in late seasons I have known one to 

 appear as late as the 24th of May. Pupation usually 

 takes place on the leaves of the food-plant. The 

 majority of immature females migrate from the leaves 

 in spring, and fix themselves to the tender branches of 

 the ivy, but most of them return again to the leaves to 

 spin up. The cottony material first secreted is attached 

 to the body of the insect, and is less compact than the 

 finished ovisac ; the secretion appears on every part 

 of the body except the cephalic extremity, which 

 remains uncovered. The time occupied in the forma- 

 tion of the ovisac is only about four to five days, the 

 first coat being very rapidly secreted. 



Distribution. Discovered by M. Lichtenstein at 

 Montpelier, France, but I believe it has not been met 

 with elsewhere on the continent of Europe, nor in any 

 other part of the world besides Britain. 



EXPLANATION OF THE PLATE. 



PI. XLI, fig. 1. Insects (male puparia and female 



ovisacs) natural size in situ on ivy leaf. 

 Fig. 2. Adult females natural size immediately prior 



to the formation of the ovisac, on branch of ivy. 

 Fig. 3. The same, x 7. 



Figs. 4, 4 a. Antennae of adult female, x 140. 

 Fig. 5. Leg of the adult female, x 140. 

 Fig. 5 a. Tarsus and claw of adult female. X 300. 

 Fig. 6. Stigmatic area of adult female with spines 



and grouped spinnerets, x 300. 

 Fig. 6 a. Marginal spines of adult female. X 300. 

 Fig. 7. Male. X 25. 

 Fig. 8. Head of male (dorsal) ; a, eye ; I, ocelli. 



x 100. 



