226 Prof. J. O. Westwood on some 



skin of tlie abdomeu is retracted, but still present. A 

 similar specimen has also been observed by Mr. S. H. 

 Scudder. 



Zyg^na exulans, var. Vanadis. — Dr. Standinger 

 (Stettin. Ent. Zeit. 1861, xxii. p. 359), describes a larval- 

 headed male of this species. The mouth parts of the larva 

 were immovable in the living insect, the head was fastened 

 to the prothorax, and moved only by the motion of the 

 latter, which was fully developed beneath with its legs. 

 Dr. Staudinger believed it impossible that the head of the 

 imao-o was enclosed in this larval head. 



Smerinthus tili^. — Prof. Van der Hoeven, Tijdshr. 

 V. Natur. Gesch. vii. p. 279, mentions a caterpillar of this 

 species which had not been able to cast off in the last 

 moult the skin covering of the spine of the tail. 



Sphinx, sp. — Dr. Hagen, op. cit. p. 11, mentions a 

 sphinx captured by M. Trouvelot, having the head of 

 the caterpillar. 



BoMBTX MOEI. — In the Tijdschrift voor Nat. Gesch. 

 1840, vol. vii. pp. 257 — 270, pi. 1, an interesting series of 

 observations are published by J. J. Bruinsma, on chrysa- 

 lids of the common silkworm, which had been taken out 

 of the cocoon, having the upper part of the larval skin 

 still remaining ; one of which was subsequently trans- 

 formed into a moth with the caterpillar head still remain- 

 ing, the head of the caterpillar covering exactly the jolace 

 where the head of the moth should be, so that nothing 

 was to be seen of it, nor of its antennae or eyes. The 

 right part of the head was taken off, and beneath it the 

 right antennas was discovered, well formed, but coiled up. 

 In taking off more of the skin, a well-formed eye of the 

 perfect insect appeared. Several other chrysalids of the 

 silk moth were aho described and figm^ed, retaining the 

 head of the larv^. Other specimens of the silk moths 

 retaining the head of the larvae (observed by Mr. Ein- 

 dohvcn) were described in a supplemental note by Van 

 der Hoeven, who also drew attention to a memoir by 

 J. Jonston, in his Hist. Nat. de Insectis, AmsteL 1657, 

 p. 123, and 1768, p. 176, concerning a male and female 

 B. mori. In both the head of the larva was retained, 

 covering the well-developed head of the imago. 



