376 Mr. Westwood on the Habits of a Saw-Fly. 



Llyn y Cwn ; I have also gathered it in old peat-pits near the 

 outlet of the Llanberris Lakes, and near Dolgelley, N.Wales. 



It is a very distinct species, and in the great length of its 

 joints remarkably differs from the other species of this genus. 



Filaments pale green, very slender, and without a mucous 

 sheath. The joints are cylindrical when viewed transversely, and 

 have two minute angles. The endochrome, stellate, as in the 

 other species, has five or six rays. 



That the crenatures are situated in the angles and not in a 

 groove as in D. mucosum, is shown by their prominence and dis- 

 appearance at regular distances as in D. cylindricum, which re- 

 sults from the twisting of the filament. 



The notch seems less like an interruption of the outline than 

 in the other species, but rather as if the angles were attached to 

 the sides of the joint. 



The joints are somewhat inflated. When the angles are not 

 visible they resemble small barrels placed end to end. Where 

 the angles are fully displayed, the appearance may be compared 

 to the juxtaposition of two flower-pots by their mouths, the rims 

 and interval between which will represent the crenated angles. 



On account of the great length of the joints, the division of the 

 endochrome into two portions is very strongly marked. 



LIV. — Note on the Saw-Fly (Lyda inanita) the subject of M. Hu- 

 berts paper in the preceding Number. By J. 0. Westwood, 

 Esq., F.L.S. E.S., &c. 



To Richard Taylor, Esq. 

 Dear Sir, 

 Your readers will be interested to learn that the curious insect 

 whose proceedings are detailed in the last number of the ( Annals ' 

 is a native of this country. For ten years past I have observed 

 it on the rose-trees in my garden at Hammersmith, where I have 

 watched its proceedings in detail, and had prepared a history of 

 it with a view to publication. A short abstract of my observations 

 on it was published in my l Introduction to the Modern Classi- 

 fication of Insects/ vol. ii. p. 107, accompanied by a figure of the 

 case as well as of the perfect insect (with which M. Huber was 

 unacquainted), and which is the Lyda inanita, which appears in 

 the imago state in the last week of May, flying about the bushes 

 in the garden with great velocity and settling on the leaves in the 

 sunshine, its splendidly golden-coloured wings rendering it a very 

 beautiful object. 



I am, dear Sir, yours very truly, 



John 0. Westwood. 



