34 MODERN CLASSIFICATION OF INSECTS. 
towards the extremity with broad short cilizw, and a large air-tube 
running down the centre of each; the two plates on each side of the 
segment are of nearly equal size. Reaumur has also represented 
(pl. 45.) another pupa, with simple head and long legs, and in which 
the gills form a large and broad plate, which is ordinarily folded so as 
to appear like two narrow plates. He has not described the imago of 
this species. In the following plate, he has figured two other kinds of 
pup, in one of which (whose imago is not given) the mandibles are 
very broad, porrected, and dentated, and the gills formed as in the 
pupa of E. vulgata. The other species appears to be a Cloeon like 
Goring and Pritchard's figure, but the gills of the pupa are represented 
like those of E. vulgata. 

The family LiseLLULID#& *, comprises an ‘extensive and beautiful 
group of large-sized insects, well known under the common names of 

* Brstiocr. Rerer. ro tHe LIBeLLULIDA. 
Bartram. On the Dragon Fly of Pensylvania, in Phil. Trans. vol. xlvi. 1750. 
Miiller. Enum. ac Deser. Libell. Agri Friedrichsd. Nov. Act. Nat. Cur. tom. ili. 
1767. 
Vander Linden. Agriones Bononienses Descr. 4to. Bononix, 1820. — Ditto, Aushnx 
Bonon. Deser. 4to. Bon. 1820. — Ditto, Monogr. Libell. Europ. Specim. 8vo. 
Brux. 1825. — Ditto, Notice sur une Empreinte d’Insecte. 
Hansemann, in Wiedemann, Zool. Mag. 2 band. (Europ. Agriones. ) 
Van der Hoeven, in Ann. Se. Nat. 1825. (Neuration of Wings). 
Guérin. Mag. Zool. No. 15. (Agrion fulgipennis). 
Brullé, in Ann. Soe. Ent. France, 1833. (Mouth of Libell.). — Ditto, in Exped, 
Scient. de Morea. 
Newman, in Entomological Magazine, vol. iv. and v. 
Rathke. De Libellularum Partibus Genitalibus. 4to. Regimont. 1832. 
Fonscolombe, in Ann. Soc. Ent. de France, 1837, 1838. 
Charpentier. Hore Enutomologice.+ 
Leach. Zoological Miscellany ( Petalura). 
Latreille. Hist. Gen. Crust. et Ins. vol. xiii. 
Kirby, in Linn. Trans. vol. xiv. (Agrion Brightwellii.) 
Harris. Exposition of English Insects. 
Eversmann. Libell. Wolga. Bull. Moscow, p. 239. 
De Selys Longchamps. Catal. des Lepidopt., and Tableau des Libellul. de la Bel- 
gique. Liege, 1837. 
Drury, Savigny (Egypt), Olivier (Ene. Méth.), Fabricius, Perty. 
+ M. Charpentier has shown me a thick folio volume of drawings of the different 
species of this family, of which he is preparing a monograph. 
