( xxxi ) 



Dr. T. A. Chapmax exhibited two full-grown laivse of 

 Thestor hallus, sent by Mr. H. Powell, from Hyeres. In its 

 previous stages the back, except the dorsal line, is bright 

 yellow, from the metathorax to the sixth abdominal segment, 

 the ends being reddish, giving the larva a very brilliant 

 appearance, while the conspicuous black spiracles on the top 

 of the seventh and eighth (abdominal) segments give very 

 much the appearance of a mammalian head to these segments. 

 In this last skin the colours are much darker and more red- 

 purple, and the posteiior spiracles less obvious. The front of 

 the larva has now much more the aspect of a head, say of a 

 wild boar, largely owing to the uniform colour, black spiracles, 

 and depression of the prothoracic plate which characterises the 

 larva throughout. There are two eversible glands behind the 

 last pair of spiracles as well as the glandular line across the 

 preceding segment. The lenticles are very inconspicuous. 

 The President remarked that the terrifying appearance 

 usually occurred in large insects. 



Dr. Chapman also exhibited a larva of Heterogyna faradoxa, 

 full fed, reared from the egg at Reigate, and a cocoon of Oryyia 

 auro-limlata, with parasite Braconid. In this instance a 

 larva produced an imago and the parasite. The cocoon when 

 opened last October showed the cocoon of a Braconid within 

 it ; a dense oval-ribbed cocoon of whitish silk, with longitudinal 

 darker flutings. One compartment of the 0. auro-limbata 

 cocoon was quite empty and flattened, the other contained 

 larva-skin of Orgyia, pupa-skin of Orgyia, a small shrivelled $ 

 of Orgyia denuded of wool and containing eggs (perhaps a dozen), 

 and the microgaster cocoon, which was well coated with and 

 entangled amongst the loose wool of the moth. The cocoon 

 looked as if made first and mixed up in the hairs afterwards. 

 If this be correct, then the microgaster larva emerged from 

 the pupa, and the moth nevertheless emerged afterwards. As 

 against this, the cocoon was loosely, if at all, attached to 

 the cccoon of the moth, as one would expect it to be if it 

 emerged from the pupa. In that case it must have emerged 

 from the moth. In any case, the microgaster and the 

 moth both came from the same larva, and the moth, though 

 containing few eggs and (not being fertilised) laying none. 



