474 Dr. T. A. Chapman's Contributions to 



instar. judging from the density of the hairs and the 

 hollowness of the slope, though no doubt the abundant 

 dorsal and lateral hairs make the flanges seem higher 

 and consequently the hollow of the slope greater than they 

 are in reality. There is a faint indication of a possible 

 pale lateral line, and less so of a dorsal one. 



It still feeds by mining, by means of its long neck, between 

 the two cuticles of the leaves. 



A larva (No. 2) 4-5 mm. long, possibly in same instar 

 as No. 1, is much the same, except that it is of a yellowish 

 or brownish tint overlying the green, as though the skin 

 colour was dominant over the green colour of tissue or 

 fluid beneath ; it has no indication of dorsal or lateral line, 

 the hairs seem rather darker and are certainly not quite so 

 long, suggesting it is really in an earlier instar. 



Larva No. 3 is still smaller and apparently laid up for 

 moult ; these are all the larvae of eros that now remain ; 

 they are remarkable as compared with A. ther sites, being 

 at the stages above indicated, whilst thersites brought out 

 of cold at same date are now emerging as imagines. 



Their small numbers prevents one treating them with 

 any disrespect for examination, etc. 



March 17. — A larva of P. eros apparently full-grown 

 in 4th instar eats half thickness of leaf or even some- 

 times whole thickness, but these leaves are small, thin and 

 succulent (forced). 



When walking it is just over 5 mm. long, 2 mm. broad, 1-6 mm. 

 high, of a dull green colour (decidedly a clearer brighter green than 

 thersitis or icarus at this stage), hair bases of long hairs in flanges and 

 some at middle of slope black, faint yellow lateral line indicated, 

 dark dorsal line (vessel), paler along dorsal flanges and of oblique 

 lines along slope rather imagined than seen. Tlie smaller hairs 

 have also dark bases, but less dark than those of the larger basis, 

 or being so much smaller seem to be so. Tlie honey-gland is 

 surrounded by comparatively few lenticles, etc. The long hairs 

 are quite 0*5 mm. long, of a faint brown tmge, quite conspicuously 

 brownish taken together. 



March 20. — The yellow lateral line is now quite distinct, 

 almost bright, it is wanting in the other specimen. 



March 26. — The larvae have been eating up to date, 

 but seem to-dav to be settling down for moult. 



March 31.— One larva has moulted this morning. 



