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



None of the larvae taken on Oxytropis seemed to be 

 thersites, but whether they were icarus or eros or both was 

 quite impossible to say. They were found generally 

 beneath the leaf petioles, usually, however, after having 

 dropped from these amongst rubbish below. One was 

 found by searching, after first detecting its cast skin. 

 Two other cast skins were found, but the corresponding 

 larvae could not be found; the larvae when so small no 

 doubt were easily lost by falling amongst the rubbish 

 below the plants, one was found on a stone beneath a 

 plant. The larvae were nearly all very small, apparently 

 recently moulted into the 4th instar. 



They eat the interior of the folioles through a small 

 aperture, like the work of a Coleophora, of which also a 

 pistol-shaped case was noticed. Small larvae of Hetero- 

 gynis to the number of a dozen or two were seen on the 

 Oxytropis, generally very obvious and exposed towards 

 the ends and uppersides of the leaves. 



As they grew these larvae in the 4th instar varied but 

 little from each other, but were so like icarus at this stage 

 (I had no living larvae of icarus by me for comparison, 

 and had to trust to memory) that I felt quite uncertain 

 whether all were icarus, all eros, or a mixture of both, they 

 were certainly not thersites. These three species all flew at 

 the locality where I found the larvae in fairly equal numbers. 

 Their general appearance is well shown in Figs. 5, 6 

 and 7. 



The same doubt continued when the larvae reached 

 the last (5th) instar, indeed it became intensified by 

 certain peculiarities. 



A note made on June 7th shows that one larva out of 6 

 that were doing well seemed larger and of much brighter 

 colour than the others. Had I one larva of one species 

 and five of another ? 



Of the supposed (or hoped-for) eros 5 seem nearly full 

 grown, one of them looks younger than the others but is 

 larger, i. e. it is flatter and wider and more active, eating 

 freely, the others are perhaps only sulky but are short, 

 round and bunched. 



No. 1 is 12 mm. long, has a bright yellow dorsal and lateral line, 

 the latter very narrow and defined, but bright enough to make the 

 lateral hairs look yellow, when seen through them. The dorsal 

 line seems to diverge a little on each segment, i. e. the distance is 



