1905.] 129 



SOME OBSERVATIONS ON HASTULA SYERANA, Mill. 

 BY T. A. CHAPMAN, M.D. 



{Continued from page 101). 



In 1901, by the middle of March, Tortrix unicolorann had all 

 spun up, most of them for some time, and all had emerged before the 

 end of the month. At this date larvae of R. hyerana could still be 

 found by no means full-fed, and a few were still larvae, feeding, on 

 April '23rd, when however most of them had spun up. At the end of 

 June there was no sign of any larva pupating. On August 10th a 

 moth emerged, and four more a[)peared up to August 31st, two on 

 September lith, and one on September 15th, and one on the 16th. 

 At this date some, not all, of the cocoons were examined, most were in 

 pupa, but two were observed still to be larvae. To the end of 

 September twenty-six emerged, and nineteen more to October 19th, 

 when the last came out. The two on lupin emerged one on 

 September 30th and one October 17th. The first nine were all pale 

 forms Of the last seventeen, nine were dark. So that there was 

 an appreciable tendency for the earlier emergences to be pale and 

 the later dark. 



The specimens bred by my friend M. Bourgeois at Geneva, 

 gave, he tells me, the following results. He bred seven, one emerged 

 August 27th, pale. 



Three were pupae and three larvae on September 4th. 



The last pupated on October 8th. By the 13th three more had 

 emerged of which one was dark. The remaining three of which 

 two emerged October 24th, and the last November 16th, were all dark. 



I had better perhaps put altogether the points in which my 

 experience of the insect differs from Milliere's. He says the larvae 

 live in the stems in the manner of Nonagrias, or more especially of 

 Schoenobides, and not like Tortrices usually do. He says, however, that 

 he found many burrows of the larvae empty, their tenants having gone 

 off to pupate. I fancy from this that he found his larvae chiefly in 

 the flowering stems, as he says he got them by splitting the stem. I 

 should describe the larva as leading quite a Tortrix life and generally 

 amongst the leaves. I found, however, when many of them had left 

 the plants full-grown, that one often found a belated larva in a 

 deformed flower stem, usually amongst the flowers, and it was 

 probably these that Milliere met with. But here also they lived in a 



