Mar., '07] ENTOMOLOGICAL NEWS. 77 



The color changes which take place during this larval and 

 early pupal life are very remarkable. Eggs sectioned at the 

 time they turn brownish are found to contain a fully formed 

 larva. The body is doubled up in the egg with the ventral 

 surfaces together, the head lying next to the micropyle. 



At birth the larva measures less than 1.5 mm. in length. 

 The body is lemon-yellow with grayish tubercles bearing large 

 glandular hairs, just as in other Anthocharid larvae. The head 

 is very dark, and before the first moult, becomes a shiny jet 

 black. 



After the first moult the head is no longer black, but green- 

 ish gray, and the whole body becomes green, due, perhaps, 

 as Poulton* suggests, to transformed plant pigments. Before 

 the end of the second instar the longitudinal stripings begin 

 to show. There is a grayish-green median dorsal line ; then on 

 each side, a subdorsal light yellowish-green line, a lateral gray- 

 green line, and a narrow infralateral yellow-green line be- 

 between the spiracles and the base of the prolegs. The ventral 

 surface and legs are grayish-green. 



During the third instar the colors as described by Mr. Ed- 

 wards are fully developed. The dorsal and lateral lines be- 

 come slaty in hue, shading out into green which merges into 

 the yellow of the subdorsal line. The infralateral line becomes 

 pure white beneath the spiracles, and a very narrow light- 

 yellow line lies just below the white. 



In the fourth and early part of the fifth instar these colors 

 do not change except to become brighter and more contrasted. 

 The dorsal and lateral slate-green lines are certainly correlated 

 with physiological processes, for they lie exactly peripheral 

 to the dorsal and lateral blood vessels, which may be seen 

 pulsating beneath them if examined with a hand lens. As the 

 last instar is nearing its end, the brilliancy of the color pattern 

 is lost. The green becomes ashy gray-green, and the yellow 

 lions turn olive and are somewhat reduced in size. 



Shortly after this a peculiar purplish tinge makes its ap- 

 pearance at the posterior end and about the thorax. This 



*Poulton, E. B., 1893.— Experimental Proof that the Colors of certain 

 Lepidopterous Larvae are largely due to modified plant pigments derived 

 from the food. Proc. Roy. Soc. of London, vol. liv., pp. 417-430. 



