346 CLASS VIII. 
On the back, at the ninth ring of the abdomen, there is a tube for respira- 
tion. These larve swim expeditiously, change their skin a few times, and 
become pup, 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 
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 
a period of three or four weeks. See SwamMMERDAM Bib. d. Natwwr. pp. 
348—362. Tab. XXxI. XxxiI.; RéaumurR Ins. tv. Tab. 43, 44; J. M. Bar- 
rut, De Culice Dissertatio, Ratisbonne, 1737, 4to, c. Tab. &e. 
Anopheles Muic. Palps in both sexes of the length of proboscis. 
Sp. Anopheles bifurcatus, Culex bifurcatus L., GuéR. Iconogr. Ins. Pl. 92, 
fig. 2. 
Comp. on genus Culex Ropineau-Desvorpy, Essai sur la Tribu des 
Culicides, Mém. de la Soc. d’ Hist. nat. de Paris, 1. 1827. pp. 390—413 
(new genera Sabathes, Psorophora, Megarhinus). 
OrpEeR VIL. Hymenoptera. 
Hexapod Insects, with four membraneous wings, the inferior less 
and with fewer veins. Maxille elongate, mostly slender, encasing 
the labium. Abdomen of females almost always terminated by a 
terebra or aculeus (borer, sting). Metamorphosis complete. 
Hymenoptera L., Piezata Fasr. Amongst other works the fol- 
lowing treat of this order : 
J. L. Curist, Naturgeschichte, Klassification und Nomenclatur 
der Insekten vom Bienen, Wespen und Ameisengeschlecht. Mit 60 
ausgemalten Kupfert. Frankf. a Main, 1791, 4to. 
J. C. Fasricu, Systema Piezatorum. Brunsvige, 1804, 8vo. 
G. W. F. Panzer, Entomologischer Versuch die Jurineschen Gat- 
tungen der Hymenoptern nach dem Fabriziusschen system zw priifen. 
Niirnberg, 1806, 8vo. (also under the title of Aritische Revision der 
Insektenfauna Deutschlands Iles Bindchen.) 
(The work of Jurtne, Nowvelle Méthode de classer les Hyméno- 
pteres et les Diptéeres, av. fig. Tom. 1. Genéve, 1807, I have not 
been able to meet with). 
C. Dautpom, Clavis novi Hymenopterorum systematis adjecta 
synopsi Larvarum Scandinav. eruciformium. Cum Tab. lithog. 
color. Lunde, 1835, 4to. 
