56 COLLEMBOLA OF MINNESOTA 



ens out over the entire surface of the small abdominal segment. 

 At the insertion of the legs, the thorax is a faded, grayish-blue, 

 a continuation of the side bands of the abdomen. Legs, manu- 

 brinm, dentes, and medial part of the mucrones gray-blue. A 

 dark-blue spot between the antennae. Ocelli on a black patch. 

 Antennas bright violet, at least Ant. II, III and IV. Antennae 

 much longer than the head. Ant. IV ringed, composed of 

 about seven rings. Upper claw slender, without a tooth, ap- 

 parently without a tunic. Under claw ending in a brush-like, 

 much-slit continuation (Untere Klaue in eine pinselformig, 

 zerschlitzten Fortsatz auslaufend), which reaches considerably 

 beyond the end of the upper claw. Tenent hair wanting on the 

 tibia. Dentes about three times as long as the mucrones. Mu- 

 crones broad, lancet-like with hyaline edges ; the dorsal edge 

 broad, with about n or 12 distinct ribs, the ventral narrow with 

 indistinct ribs. Length, .75 mm. 



"In the nature of the mucrones it approaches S. aquaticus 

 and S. malmgrenii. In breadth of mucrones it comes between 

 these two species. S. penicillifer is, however, distinguishable 

 from them in the ringed form of Ant. IV, the shape of the under 

 claw and the color markings." In our collection this species is 

 represented by but one specimen, which would indicate that it 

 is probably rare. Schaffer had but three specimens, which 

 were taken in a small pool near Bremen. Mine was taken in 

 the edge of a slough on Gray Cloud Island, in the Mississippi 

 River, July, 1899. The antennas are distinctly reddish violet. 

 Ant. IV rather noticeably ringed, fig. n. The feet of the third 

 pair, fig. 9, are smaller and shorter than those of the first and 

 second pairs. Though the "pinselformig" prolongation is not so 

 much branched as in that figured by Schaffer, there is little 

 doubt of the species, and possibly if the other claws in the 

 specimen were more favorable for observation they might prove 

 the correctness of his figure. Schaffer has made no mention 

 of several very long, brownish bristles which proceed from the 

 manubrium, and reach beyond the middle of the dentes when 

 the furcula is held erect. My specimen is darker than that de- 

 scribed ; the dark bluish color entirely covering the back and 

 the terminal segment, but shading down on the sides to a citron 

 yellow ground color. The sides of the abdomen are lighter than 



