12 COLLEMBOLA OF MINNESOTA 



Found in deep, dark woods, vinder drift-wood. Quite rare. 



Sminthurus minnesotensis n. sp. 



PI. II, Figs. 10-I6 and PI. XIV. 

 Purple and yellow above; antennae, legs, furcula and under 

 side of body dark blue ; under side of small abdominal segment 

 yellow ; head marbled with yellow and purple. A narrow, me- 

 dian, dorsal band of purple on the thorax ; in front of this, two, 

 and behind it, four or five cross-bands of purple, alternating with 

 broader ones of yellow. Ant. IV showing about seven distinct, 

 bead-like rings, each bead most enlarged at the distal end, 

 fig. lo. Head broad in proportion to the body, bearing on the 

 vertex an elevated mound, on which may be seen a pair of 

 short, horn-like hairs, fig. i6. The central ocellus is small, the 

 rest about of a size, with a slight preference in favor of the front 

 one of the median row, fig. 13. The long, curved bristles on the 

 head point forward. The body is elliptical from a dorsal view ; 

 rather low, and sloping from the thorax, as seen from the side. 

 The back is covered with long, pale, backward-curving bristles. 

 Abdomen not broader than the thorax, its apical segment large. 

 Anal appendages, genital papillae and tenaculum shaped much 

 like those of S. fuscus. The furcula also resembles that of S. 

 fuscus in general form, Ijut dififers in the dark color, and in the 

 mucrones, which has the outer edge entirely smooth, and is 

 more inclined to the acuminate form, and not quite so deeply 

 trenchant. The feet differ slightly, the upper claw of the third 

 pair being rather more slender than on the first and second pairs. 

 In the third pair, too, the inferior claw is of slightly different 

 form, fig. 14, and appears to bear the hair at its very apex, in- 

 stead of farther up, as in the others. The superior claw bears 

 a small, inner tooth. No clavate hairs are present. The claws 

 are not enclosed in a tunic. The dorsal side of the trochanters 

 is colorless. Length 1.5 mm. 



Taken all through the summer, though never very abun- 

 dant, under bark and pieces of drift-wood, in low, dark woods 

 along the Minnesota and Mississippi Rivers, and in July at Lake 

 Vermillion. They often occur with Papirius muculosus Schott, 

 which they closely resemble m general coloration. Sometimes 

 I have taken them with S. niger Lubb. Their general appear- 



