390 APPENDIX. 



Polistes Lanio of Fabricius, and in all probability the Vespa Canadensis of 

 Linnaeus ; a specimen of the species is preserved in the Banksian Cabinet. 

 On examining the nest, I found it consisted as usual of a single comb of cells, 

 having in the centre at the back a short footstalk, by which the nests are 

 attached in their position ; the comb contained sixty-five cells, the outer ones 

 being in an unfinished state, whilst twenty-two of the central ones had remains 

 of exuvifB in them, and one or two closed cells contained perfect insects ready 

 to emerge ; about half a dozen of the wasps had the anterior portion of their 

 bodies buried in the cells, in the manner in which these insects are said to 

 repose. In one cell I observe;! the head of an insect evidently of a different 

 species, it being black and shining. On extricating it, I discovered it to be 

 a species of Trigonalys ; I subsequently carefully expanded the insect, and it 

 proved to be the Trigonalys bipustulatus , described by myself in the Ann. 

 and Mag. of Natural History, vol. vii., 2nd Series, 1851, from a specimen 

 captured at Para by Mr. Bates, now in the possession of William Wilson 

 Saunders, Esq. The insect was not enveloped in any pellicle, nor had the 

 cell been closed in any way ; the wings were crumpled up at its side, as is 

 usual in Hymenopterous insects which have not expanded them, proving satis- 

 factorily that it had never quitted the cell, and that Trigonalys is the parasite 

 of Polistes. 



This discovery is one of much interest, proving the relationship of the insect 

 to be amongst the pupivora, to which family it had been previously assigned 

 by Mr. Westvvood, see Vol. III. Ent. Trans, p. 270. The specimen is seven 

 lines in length, entirely black, the head shining, the thorax and abdomen 

 opaque, and having two white maculae touching the apical margin of the basal 

 segment above ; the wings are smoky, the antennne broken off. Of one of them 

 I found subsequently seventeen joints — the perfect insect in the possession of 

 Mr. Saunders having twenty joints." 



Lepidoptera. 

 Drusilla Mylcecha, Tab. iv. fig. 1^ 2. 



This fine butterfly* was found flying in considerable 

 plenty in tlie woods of one of the islands of the Louisiade 

 Archipelago ; it forms a very interesting addition to a 

 genus, of which but few species are known, and is allied to 

 the Drusilla Catops of Dr. Boisduval, described and figured 



* Described (but not figured) by Mr. Westwood, in the Transactions of the 

 Entomological Society of Loudon, New Series, Vol. I., p. 175 (1851), from 

 Mr. M.'s specimens in the British Museum. Mr. W. felt anxious to 

 describe this striking Drusilla. 



