2546 Insects. 



fish all its supply of nutriment, that it would drop oft", but he soon found that such 

 was not the case, but that it would be taken into the abdomen : this was made manifest 

 by an extension and growth of a delicate layer of muscular fibres over its outer surface, 

 and by a formation of new vessels, which were found to be continued from, or to be 

 branches of the intercostal vessels before described ; and as at this stage the author 

 stated there were some points of great interest to be observed in the development of 

 these new vessels, it became necessary to mention them here, as there were very few 

 places in the animal body, in which the growth of new tissues could be so well studied. 

 About the fourteenth day a few straight vessels were seen upon that part of the 

 vitellicle which was attached to the body ; each of these, in most cases, ended in a 

 small mass of extravasated blood, and if examined in a few hours, it could be seen 

 that each mass of blood was acted on by the motion of the blood of the vessel ; the 

 next stage to be observed was an increase of one of the masses of blood, and their 

 becoming of a curved figure ; the same changes were taking place in other masses in 

 the neighbourhood, and at last two adjoining masses would coalesce and form a loop, 

 the contents of which, after another short period, would be under the influence of the 

 general circulation ; first being gradually pushed on, and then recoiling and producing 

 an oscillatory movement, and last of all a continuous current was established in it ; 

 as this was not the most common mode of the formation of new vessels, the author 

 thought proper to allude to it, as it served to explain how masses of blood, which 

 have become extravasated, may become supplied with new vessels. 



(To be continued.) 



Colias Hyale. — The occurrence of this butterfly in such profusion, in the years 

 1835 and 1842, as recorded in the ' Entomologist' (Entom. 384), and the very inge- 

 nious hypothesis there broached by Mr. Desvignes that its visits were septennial, in- 

 duced many of our older entomologists to consult their note-books, and it was found 

 that the years 1821 and 1828 had been equally prolific. Its septennium is again 

 complete in 1849, and at this bright hour of the morning, on this very 15th August, 

 it should be flying about the lucerne and clover fields of our southern coasts : it will 

 be very interesting to me to hear that this is the case. — Edward Newman ; August 

 15, 1849. 



Occurrence of Pamphila Comma near Salisbury. — I scarcely know whether Pam- 

 phila Comma may be considered an insect of sufficient rarity to justify a notice of its 

 capture in the pages of the ' Zoologist.' It is, however, to say the least, an extremely 

 local species, and till this summer I never myself happen to have met with it, except 

 some years ago, in the vicinity of Dover, and there finding only two specimens, owing 

 probably to my not being on the spot at the best season for its flight ; for where the 

 insect docs occur it generally seems to be in plenty. I venture, therefore, to state 

 that I found Pamphila Comma, in good abundance, on a chalky slope in the grounds 

 of Durnford manor-house, six miles from Salisbury, on the 19th of July. The in- 

 sects were fresh and in good condition, apparently but recently produced from the 

 chrysalis. The middle of July, therefore, may be considered as the time of its ap- 

 pearance. Many authors, e. <j. Lewin, Haworth, Wood and Stephens, state August, 



