This species is so closely allied to the last that it is ranked by Dr. Hooker as a sub-species.  It differs chiefly in the larger size of its leaves, and in the glandular hairs near the basal part of the midrib being longer.  But it likewise differs in constitution; I hear from Mr. Ralfs, who was so kind as to send me plants from Cornwall, that it grows in rather different sites; and Dr. Moore, of the Glasnevin Botanic Gardens, informs me that it is much more manageable under culture, growing freely and flowering annually; whilst Pinguicula vulgaris has to be renewed every year.  Mr. Ralfs found numerous [page 391] insects and fragments of insects adhering to almost all the leaves.  These consisted chiefly of Diptera, with some Hymenoptera, Homoptera, Coleoptera, and a moth.  On one leaf there were nine dead insects, besides a few still alive.  He also observed a few fruits of Carex pulicaris, as well as the seeds of this same Pinguicula, adhering to the leaves.  I tried only two experiments with this species; firstly, a fly was placed near the margin of a leaf, and after 16 hrs. this was found well inflected.  Secondly, several small flies were placed in a row along one margin of another leaf, and by the next morning this whole margin was curled inwards, exactly as in the case of Pinguicula vulgaris.

Pinguiculalusitanica.

This species, of which living specimens were sent me by Mr. Ralfs from Cornwall, is very distinct from the two foregoing ones.  The leaves are rather smaller, much more transparent, and are marked with purple branching veins.  The margins of the leaves are much more involuted; those of the older ones extending over a third of the space between the midrib and the outside.  As in the two other species, the glandular hairs consist of longer and shorter ones, and have the same structure; but the glands differ in being purple, and in often containing granular matter before they have been excited.  In the lower part of the leaf, almost half the space on each side between the midrib and margin is destitute of glands; these being replaced by long, rather stiff, multicellular hairs, which intercross over the midrib.  These hairs perhaps serve to prevent insects from settling on this part of the leaf, where there are no viscid glands by which they could be caught; but it is hardly probable that they were developed for this purpose.  The spiral vessels pro- [page 392] ceeding from the midrib terminate at the extreme margin of the leaf in spiral cells; but these are not so well developed as in the two preceding species.  The flower-peduncles, sepals, and petals, are studded with glandular hairs, like those on the leaves.

The leaves catch many small insects, which are found chiefly beneath the involuted margins, probably washed there by the rain.  The colour of the glands on which insects have long lain is changed, being either brownish or pale purple, with their contents coarsely granular; so that they evidently absorb matter from their prey.  Leaves of the Erica tetralix, flowers of a Galium, scales of grasses, &c. likewise adhered to some of the leaves.  Several of the experiments which were tried on Pinguicula vulgaris were repeated on Pinguicula lusitanica, and these will now be given.