* * * * * A species less common than the preceding, but closely resembling it, is the _Françoise_ of Geoffroy, the _Libellula quadrimaculata_ of Linnæus. It owes its descriptive or specific designation to the colours which diversify its wings. On the outer edge of each, two brown marginal spots are conspicuous: the first at the place where in the Eleanora (and other species) the black spot is found, and the second nearly in the centre of the external border, which, at this point, is considerably compressed; moreover, the lower wings are marked, beneath their yellow base, with a kind of triangular spot of blackish brown, finely reticulated with yellow. Externally, there is no difference of appearance between male and female, except that the abdomen of the latter is somewhat the larger. * * * * * Now we come to the _Sylvia_, the _Libellula cancellata_ of Linnæus. Its eyes and thorax wear a greenish hue; the diaphanous wings are spotted with brown near the outer margin; the abdomen is of a bluish-gray; the extremity of the sixth segment, and the following segments, are wholly black. The _Julia_, or _Libellula grandis_ (Linn.), has been separated from the Libellulæ by the great entomologists, such as Fabricius and Latreille, and included in the genus _Aeshna_ (Phœbus, what a name!), preserving the descriptive adjective _grandis_. What are the reasons put forward to justify this separation? Principally, the form of the abdomen, and the position of those little smooth and simple eyes, like tiny pearls or _pearlets_, which we call _ocelli_. In the Libellulæ, properly so called, the ocelli, three in number, are situated on either side and on the exterior margin of a kind of semi-triangular vesicle, and the abdomen is slightly depressed, and not unlike a club; while in the _Aeshnæ_ the ocelli are placed on a simple keel-shaped transversal embossment, and the abdomen is narrow, elongated, and almost cylindrical. * * * * * The _Aeshna grandis_ (or the "Julia") is one of the largest of the British species. Its head is large, and its eyes are of a brown colour shading into blue; the yellow thorax has two bright yellow bands or stripes obliquely painted on each side. The abdomen is of a reddish or even rusty brown; generally spotted with white and yellow at the top and bottom of each wing. This species haunts the vicinity of streams and "silent pools." * * * * * We come, in due order, to the _Aeshna forcipata_, or "Carolina," with its dirty yellow head, and its greenish-yellow thorax, the latter marked on each side with three oblique lines of black: the abdomen is black, and composed of segments laterally spotted with yellow. * * * * *