96 COLLEMBOLA OF MINNESOTA 



toothed blades much as an Achorutes. The skin is thickly cov- 

 ered with small conical, chitinous tubercles. Length, .75 mm. 



Under boxes and plant jars in University greenhouse, where 

 the dirt is quite moist. They are quite rare, and have been taken 

 withe Isotoma minima and I. fimetaria. As I have never taken it 

 out of doors, it is possibly an exotic species. Hitherto, the 

 genus has been, so far as I know, represented by but one type 

 species, F. mirabilis (Tullberg). From that species F. caldaria 

 differs in the possession of clavate hairs on the tibia, and in the 

 better development of the furcula. Whether F. mirabilis has the 

 clavate hairs on the final abdominal segments, it is impossible to 

 determine from any literature at hand, but it is improbable, in- 

 asmuch as Brook mentions some strong hairs on the fifth seg- 

 ment, "which, unless accurately focussed, look broad enough at 

 the base to be taken for spines," and yet he says nothing about 

 their ends being clubbed. Probably Tullberg's species is consid- 

 erably larger, as he gives the length as 1.5 mm. ; though my num- 

 ber of specimens of F. calderia is so limited that it is possible none 

 of them are mature. I believe this is the first record of this 

 genus in America. 



Aphorura inermis (Tullberg). 



1872. Lipura inermis. Tullberg, Sver. Podur. p. 55. 



1873. Lipura inermis. Lubbock, Monogr. Coll. and Thys. p. 194. 

 1873. Lipura fimetaria. Packard, Thys. Essex Co., Mass. p. 28. 



1890. Lipura inermis. Reuter, Coll. in Cald. viv. p. 20. 



1891. Lipura inermis. Schott, Kaliforn. Coll. p. 24. 

 1893. Lipura inermis. Schott, Palsearct. Coll. p. 88. 



1895. Lipura inermis. Reuter, Finl. Coll. p. 33. 



1896. Lipura inermis. Lie-Pettersen, Norg. Coll. p. 21. 



1896. Aphorura inermis. Schaffer, Coll. v. Hamburg, p. 161. PI. II, 18 19. 



The species is described as: "Post-antennal organ with four- 

 teen elevations. Two ocelliform punctures at the base of each 

 antenna. No anal spines. Length, i mm." 



The claws are unarmed, the lower one very slender, and, in 

 fact, little different from that figured for A. ambulans. The an- 

 tennae are comparatively shorter than in A. ambulans, and the 

 whole body seems not only shorter, but less slender than in that 

 species. The absence of anal horns in A. inermis separates it 

 easily from the species of Linne, which it otherwise so closely re- 



