346 CLASS vin. 



On the back, at the ninth ring of the abdomen, there is a tube for respira- 

 tion. These larvze swim expeditiously, change their skin a few times, and 

 become pupae, which also move sinuously, but do not eat, and advance in 

 the water head upwards, it being kept in this position by two little tubes 

 or horns that stand above the thorax and serve for respiration. On j 

 the last metamorphosis the skin splits between the tubes, and the perfect 

 insect creeps into view through the opening thus effected. It drifts for 

 a time upon the cast-off skin as on a little boat, until the wings are strong ! 

 enough, when the gnat leaves the water. These metamorphoses occur within j 

 a period of three or four weeks. See SWAMMERDAM Bijb. d. Natuur. pp. [ 

 348 362. Tab. xxxi. xxxn. ; REAUMUR Ins. iv. Tab. 43, 44 ; J. M. BAR- 

 THII, De Culice Dissertatio, Eatisbonnse, 1737, 4to, c. Tab. &c. 



Anopheles MEIO. Palps in both sexes of the length of proboscis. 



Sp. Anopheles bifurcatus, Culex bifurcatus L., GUER. Iconogr. Ins. PI. 92, 

 fig. 2. 



Comp. on genus Culex ROBINEAU-DESVOIDY, Essai sur la Tribu des 

 Culicides, Mem. de la Soc. d'Hist. nat. de Paris, in. 1827. pp. 390 413 

 (new genera Sabaihes, Psorophora, Megarhinus). 



ORDER VII. Hymenoptera. 



Hexapod Insects, with four membraneous wings, the inferior less 

 and with fewer veins. Maxillae elongate, mostly slender, encasing 

 the labium. Abdomen of females almost always terminated by a 

 terebra or aculeus (borer, sting). Metamorphosis complete. 



Hymenoptera L., Piezata FABR. Amongst other works the fol- 

 lowing treat of this order : 



J. L. CHRIST, Naturyeschichte, Classification und Nomenclatur 

 der Insekten vom JBienen, Wespen und Ameisengeschlec/it. Mit 60 

 ausgemalten Kupfert. Frankf. a Main, 1791, 4to. 



J. C. FABRICTI, Sy sterna Piezatorum. Brunsvigse, 1804, 8vo. 



G. W. F. PANZER, Entomologischer Versuch die Jurineschen Gat- 

 twigen der Hymenoptern nach dem Fabriziusschen system zu prufen. 

 Niirnberg, 1806, 8vo. (also under the title of Kritische Revision der 

 Insektenfauna Deutschlands lies Bandchen.) 



(The work of JURINE, Nouvelle Methode de classer les Hymeno- 

 pteres et les Dipteres, av. fig. Tom. I. Geneve, 1807, T have not 

 been able to meet with). 



C. DAHLBOM, Clams novi Hymenopterorum systematic adjecta 

 synopsi Larvarum Scandinav. cruciformium. Cum Tab. litliog. 

 color. Lundae, 1835, 4to. 



