es 
_ INSECTA. 299 
Ericuson, Jahresbericht, Arch. f: Naturgesch. 1843, 8. 270), it is pos- 
sible that sometimes young specimens of Podura may be placed 
under the genus Lipura (Anurophorus Nicoxer); but this entire 
genus is not on that account to be rejected, for it is very usual that a 
young form in a natural family should be represented by a per- 
manent generic form. The most remarkable deviation in this family 
is that of the genus Anwra GERvAIS (Achorutes Nicouer), where in 
place of jaws there is a suctorial mouth ; see NiIcouer op. cit. p. 33, 
Plirv. ‘fig. 5. 
Sminthurus LArr. Thorax and abdomen conjoined into a 
globose body. Antenne geniculate; terminal portion of antenna 
setaceous, multi-articulate. 
Gusrin, Iconogr. Ins. Pl. 2, fig. 4. (Add sub-gen. Dicyrtoma BouRLET). 
Podura LAatTR. Thorax separate from abdomen ; body elongate, 
with abdomen narrow, oblong. 
A. Mandibles and maxille none. Suctorial tube conical. 
Anura Grrv. (Achorutes Nicotet not Temp.) No forked tail. 
Abdomen rotundate behind. 
B. Mandibles and maxille. 
a) Antenne short, with four or five joints. 
Lipwra Burm. (Anurophorus Nicouet). Body not scaly. Abdo- 
men, instead of a forked tail, terminated by two very small conical 
diverging tubercles. 
Sp. Podura finetaria L., Lipura ambulans Gury. (nat. Pod. ambulans L.), 
DE GEER, Vu. p. 33. Pl. 3, figs. 5, 6. Nicounr op. cit. Pl. 5, fig. 2, com- 
mon in garden-mould and in flower-beds, ivory-white, 1 line long. 
Achorutes Tempteton, Hypogastrurus Bouruer, Podura NIcoxer. 
Body not squamose. ‘Tail forked, short. 
Sp. Podura aquatica L., Du Grur, Ins. vil. Pl. 11. figs. 11—13, NICOLET 
op. cit. Pl. 5, fig. 4; one line long, very common with us, forms large 
black spots on the water, near which other white spots are floating, formed 
by the cast skins. 
b) Antenne longer than head. 
Genera Jsotoma Bourtrer (Degeeria Nicouet, Desoria Nic), 
LHeterotoma Bouruet, Orchesella Tempieton, Lepidocyrtus BouRLet 
