330 



Insects. 



vesicles the office of secreting the mucus which abundantly lubricates 

 the bodies of these animals, and also that of supplying the ova with 

 their cocoon-like coverings during the breeding season. 



The loop-shaped glands before spoken of, are about seventeen in 

 number : they lie in the spaces between the sacculi of the stomach 

 and intestine, and each one receives a large branch from the lateral 

 vessel, which ramifies over the exterior and keeps it firmly adherent 

 to the blood-vessel : a small slender duct of communication connects 

 the gland to the mucous sacs, (fig. 6). The glands, in the medicinal 

 leech, are much larger and much less convoluted than in this species; 

 in both, with a high power, they may be seen to be lined with a thick 

 coating of epithelium, and to be largely supplied w^ith blood-vessels, 

 which has led many anatomists to suppose that some other office, more 

 important perhaps than that of the secretion of mucus, must belong to 

 this apparatus ; but the skin, as well as these glands, is liberally sup- 

 plied with blood-vessels, so that the function of respiration would ra- 

 ther seem to be performed by both these systems of capillary vessels. 



John Quekett. 



(To be continued). 



Note on the occurrence of Colias Edusa in Devonshire. I have been chasing Colias 

 Electra all the morning, but with no success, I am sorry to say. It is now half-past 

 11, A.M., and I have seen six specimens already this morning. They seem gifted with 

 the speed of electricity or light at the least ; I have almost given up all hopes of pro- 

 curing any specimens. On the rugged cliffs of Teignmouth, whilst they are making 

 a circuit round some bank, you can anticipate them by crossing it in a straight line ; 

 but here, on level ground, it seems impossible to catch them. They fly and you fol- 

 low, but unless they settle, which is a forlorn hope indeed, I, at least, am soon com- 

 pletely distanced. However, it may not be without interest to the readers of * The 

 Zoologist,' to know that Colias Electra has been plentiful this year at Lympstone, De- 

 vonshire. — Robert C. R. Jordan ; Lympstone, Devon, September 18, 1843. 



Note on the occurrence of Colias Edusa, in Devonshire. On the 1st of September I 

 was gratified by the sight of a splendid male Colias Edusa, which I did not expect. 

 I had no net with me, or I might have caught it as it settled on a flower of Convolvu- 

 lus sepium until I came up, but it was too cunning to allow itself to be taken by the 

 hand. — Id. 



Note on the occurrence of Colias Edusa in Sussex. I took a few specimens of this 

 butterfly near Arundel, on the 20th of last month, and saw another a few days after- 

 wards, but the heat was so great I was not inclined to chase him. I observed two 

 specimens on the banks of the south-w^estern railway, between Wandsworth and Wim- 

 bledon, about a fortnight since. — Samuel Stevens ; 38, King St., Covent Garden, Sep- 

 tember 22, 1843. 



Note on the occurrence of Colias Edusa in Leicestershire. I^ast Friday, the 29th of 



