PERFECT INSECTS WITH THE LARVAL HEAD. 
11 
chrysalis was developed ; the head of the caterpillar was still present, 
but its sutures were separated. The dorsal split of the skin reaches the 
first segment of the abdomen, and the skin of the abdomen is retracted, 
but still present. 
A similar specimen was observed last fall by Mr. S. H. Scudder. 
Zygaena exulans var. Vanadis. 
Dr. Staudinger, in a paper on the Lepidoptera of Lapland in Stett. 
En torn. Zeit., 1861, Vol. XXII, p. 359, records a larval-headed male of 
this species, found, July 11, near Bossekop. The specimen is fully 
developed, Avith the head of the caterpillar. The mouth parts were 
immovable in the living insect ; the head was fastened to the protho- 
rax, and moved only by the motion of the prothorax. The latter is 
fully developed beneath, and with its legs; above there is a horny 
black vaulted ring, somewhat hairy on the left side. Mr. Staudinger 
believes it impossible that the head of the imago is enclosed in this 
larval head. 
Sphinx spec. 
Mr. Trouvelot assured me that he had caught in Cambridge several 
years ago, a Sphinx with the head of the caterpillar. The specimen is 
no longer in existence. 
Professor Van der Hoeven, in his quoted paper, p. 274, records that 
he has seen a caterpillar of Sph. Tilice which had not been able to cast 
off in the last moult the skin covering the spine of the tail. The cater- 
pillar died before the transformation. 
Bombyx Mori. 
Mr. J. J. Bruin sma, in Tijdschrift voor Natuurl. Geschied, 1840, Vol. 
VII, pp. 257-270, pi. 1, has published detailed observations concerning 
the same deformity, accompanied by figures. 
Having read Wesmael's paper, Mr. Bruinsma concluded to try his 
own observations in raisins: silk-worms. In the course of the summer 
he found some specimens, which did not agree exactly with Wesmael's 
butterfly, but seemed interesting for publication. But shortly after 
Mr. S. Van Le uwen, also interested in the same kind of observations, 
communicated to him, August 9, a chrysalis with the upper part of the 
larval head still remaining. The chrysalis was fourteen days old, and 
had been taken out of a cocoon, in which the skin of the caterpillar 
was found. The skin showed nothing unusual, except that the head, 
which commonly remains united with the skin, was broken off. 
