PODURA. 185 



" Ocelli in macula nigra positi. Unguiculus superior 

 sine dente, inferior parvus. Mucrones furculge longi- 

 tudine f dentium gequantes. Manubrium quam denies 

 longius. Spinas anales perparv^. 



" Long. 1 millim." 



This species is especially distinguished by the large 

 and powerful basal portion of the spring, as well as by 

 the length of the end segment compared with that of 

 the teeth ; the sesfment is crooked somewhat in the 

 fashion of an S. The anal hooks are here visible only 

 under an exceedingly high magnifier, and scarcely 

 longer than they are broad, fixed to warts which are 

 only insignificantly larger than the granules of the 

 skin. The bases of these warts, which in A. pur- 

 purescens touch one another, are here pretty widely 

 apart. The upper claws are almost completely tooth- 

 less. In colour this species resembles entirely A. imr- 

 jpurescens. 



Sweden. 



PoDURA, Aud. 



Body cylindrical, segments subequal. Eyes eight 

 on each side. Antennae short, 4-jointed. Feet with 

 only one claw. No scales or clubbed hairs. Caudal 

 appendage short. 



Podura aquaticay L. 



Podura aquatica nigra, De Geer. Acta Soc. Reg. Sc. Upsal., 1740, 



— — — Linn. Fauna Suec. 



La podura noire aquatique, Geoffrey. Ins. Env. Paris. 

 Podura aquatica nigra, De Geer. Ges. de Ins. 



— — Linn. Sys. Nat. 



— — Sclirank. En. Ins. Austrise. 



— — Fabricius. Ent. Syst. 



— — Muller. Zool. Dan. Prod. 



— — O. Fabricius. Fauna Gr^nl. 



— — Latreille. Gen. Crus. et Ins. 



— — Bois. et Lac. Faun. Ent. Env. Parib. 

 AcJiorutcs — Burmeister. Hand. d. Entom. 



