94 COLLEMBOLA OF MINNESOTA 



1838. Achorutes aquatica. Burmeister, Handb. d. Entom. 



1838. Hypogastrura aquatica. Bourlet, Mem. sur les Podures. p. 31. 



1839. Achorutes aquatica. Gervais, in Walckenser. Ins. Apt. III. p. 4.36. 

 1841. Podura aquatica. Nicolet, 1'Histoire d. Podur. p. 55. 



1841. Podura aquatica. Lucas, Hist. Nat. des. anim. Art. p. 565. 



1842. Hypogastrura aquatica. Bourlet, Mem. Soc. Roy. Douai. 

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

 1867. Podura aquatica. Lubbock, Trans. Linn. Soc. 



1871. Podura aquatica. Tullberg, Fort ofv. Sv. Podur. p. 153. 



1871. Podura aquatica. Lubbock, Monogr. Coll. and Thys. p. 185. PI. 



XLII. 



1872. Podura aquatica. Tullberg, Sv. Podur. p. 50. PI. X, 1-6. 



1873. Podura aquatica. Packard, Thys. from Essex Co., Mass. p. 35 

 1890. Podura aquatica. Uzel, Thys. Bohemiae. p. 73. 



1893. Podura aquatica. Schott, Paljearct. Coll. p. 76. 



1895. Podura aquatica. Reuter, Finl. Coll. p. 29. 



1895. Podura aquatica. Reuter, Coll. pa Sno och is. p. 121. 



1896. Podura aquatica. Schaffer, Coll. v. Hamburg, p. 171. PI. II, 38. 



1896. Podura aquatica. Lie-Pettersen, Norg. Coll. p. 19. 



1897. Podura aquatica. Poppe & Schaffer, Coll. v. Bremen, p. 266. 



Opaque, blackish-blue; antennae and legs reddish brown. 

 Body broadly fusiform. Furcula reaching beyond second pair 

 of legs ; mucrones thick, short and nearly straight. Dentes ar- 

 cuate, with an incipient joint at the bend; the distal ends cov- 

 ered with transverse rows of small, chitinous tubercles. Mucrones 

 short, somewhat spear-like, with an outer tooth. Claw long and 

 slender, slightly curved, without teeth. Projecting over the claw 

 from the tibia is a long hair, which is not, however, swollen at the 

 end. Antennae about the length of the head, appearing more slen- 

 der from a side than from a dorsal view, as they are slightly flat- 

 tened. The length generally given for this species is I mm. 

 though Nicolet says "i millimetre et demi a 2." Our full grown 

 specimens measure about 1.5 mm. 



One of the most widely spread species of the Collembola, 

 being reported from almost every place where this group has been 

 studied. With us it seems very abundant. It is found among 

 rubbish on the edge of lakes where the waves dash up so that 

 part of the time the insects are on the weeds and stones, and 

 again they are jumping about on the surface of the water. Some- 

 times they may be taken in great numbers from the surface of 

 stagnant pools. It is of interest to compare the furcula with 

 the water-leapers among the Sminthuri, which they somewhat 



