60 COLLEMBOLA OF MINNESOTA 



show the purple tint ; sides of the full-grown specimens often ob- 

 scurely marked with much paler, oblong spots. 



"Body, including head, twice as long as broad, breadth and 

 depth equal ; gradually widening from the neck to the greatest 

 breadth, abruptly narrowing with a slight reentering angle to 

 the conspicuous terminal segments. Head, viewed from front, 

 as long as broad, depth half the length. Eye patches prominent, 

 elevated, black, conspicuous, bearing eight ocelli; four on the 

 inner row, three on the outer, and a single smaller one in the 

 middle ; the second ocellus from the front on the inner row is also 

 smaller than the others ; front of the head between the eyes, 

 elevated and bearing a tuft of long hairs. Antennae long, slen- 

 der, elbowed at the second joint, nearly as long as the body; basal 

 joint short but slightly longer than the terminal; second joint 

 shorter than third, the portion beyond the elbow usually some- 

 what longer than the two basal joints; third joint usually long- 

 est, the terminal half composed of seven or eight short sub-seg- 

 ments ; terminal joint short, conical, narrower than the clubbed 

 end of the third joint; composed of about ten subsegments, 

 the three basal of which are about the same width, and obscure; 

 fourth and fifth wider and well-defined; sixth and seventh nar- 

 rower and somewhat obscure ; each segment bears a whorl of 

 hairs ; and as there are three whorls on the portion beyond the 

 seventh segment, probably it represents three more ; when walk- 

 ing, the basal portion is projected upward and outward from the 

 head, the apical portion below the elbow, outward and down- 

 ward. Legs long, claws prominent, the larger curved, and bear- 

 ing two teeth on its inner face below the middle; smaller claw 

 slender, over half the length of the other. Suckers nearly as 

 long as the body, cylindrical, white, covered with papillae ; ten- 

 aculum cylindrical, prominent. Spring rather long and slender, 

 about three- fourths the length of the body; terminal segment 

 less than half the length of the second, lanceolate, unarmed, 

 concave below, and bearing on each edge of the concavity a 

 row of about forty teeth ; the teeth increase in size outward, and 

 at the end join in a common tubercle. 



"Hairs are sparsely found on all parts of the body. Under a 

 high power those on the second joint of the spring, which I 

 especially examined, were barbellate. Length, 2.5 mm. 



