186 PODURA. 



Hypogastrura aquatica, Bourlet. Mem. Soc. Roy. Lille, 1839. 



— — „ „ „ Doiiai, 1842. 



Podura — Nicolet. Mem. Soc. Helv., 1842. 



— — Lucas. His. Nat. Anim. Art. 

 Aclwt-utes aquaticus, Gervais. His. Ins. Apteres, vol. iii. 

 Podura aquatica, Nicolet. Ann. Soc. Eut. France, 1847. 



— — Lubbock. Trans. Linn. Soc, 1867. 



Plate XLII. 



Opaque, blackish-blue; antennee and legs reddisli- 

 brown. Filaments of caudal appendage curved and 

 long, reaching beyond the second pair of legs. 



Length "08 of an inch. 



Common on the surface of standing water. 



Hab. Europe, from Sweden southwards to Switzer- 

 land, and westwards to Ireland. It also occurs in 

 Greenland. 



Podura Tullbergii, Lubbock. 



Acliorutes uniunguiculatus, Tullberg. Skand. Podur. 



" Ocelli in macula nigra positi. Unguiculus superior 

 sine dente, inferior nullus . Dentes furculge triple longiores 

 quam mucrones. Spinas anales parvse, pauUo longiores 

 quam lata3, breviores quam papillse." 



Tullberg places this species in the genus Achorutes, 

 under the name of A. iinkingidculatus, from the absence 

 of the inferior claw. It seems to me, however, pro- 

 perly to belong to this genus, and as the name iiniim- 

 guimdatus is not characteristic, I propose to name it 

 after its discoverer. It may be at once distinguished 

 from P. aquatica by the shortness of the spring. 



Podura hyperbo7'ea, Boheman. 



Podura hyperborea, Bobeman. Of. af Kong. Vet.-Akad. Stockbolm, 



1865. 



" Oblonga, nigro-plumbea, opaca ; antennis pcdi- 

 busque brevibus ; abdomine apice inermi. 



