COLLEMBOLA OF MINNESOTA 101 



but three-jointed, the joint between Ant. Ill and IV being hardly 

 noticeable. There is little danger of confusing this species with 

 any other species found here. The large tubercles on the back 

 and at the posterior end of the body, which caused Nicolet to 

 name it "tuberculatus" ; the presence of but three eyes on each 

 side ; the thick body noted by Packard when he named it "gib- 

 bosa" ; all help to distinguish it. 



The mouth cone is sharp in front, and projects front of the 

 head. A very common species in Minnesota, and has been re- 

 ported as well from many other parts of the United States. It 

 lives in roten wood and in other moist, protected places. It 

 seems to prefer wood that is in an advanced stage of decay, and 

 pretty juicy, where it is to be found in the cracks and worm 

 holes. 



Neanura quadrioculata n. sp. 

 PI. XII, Fig. 15. 



Entirely white except the two black eye patches on each side 

 of the head, each eye patch containing a single ocellus. An- 

 tennae as long as the head. Tubercles not so prominent as in N. 

 muscorum, and bearing long sense hairs. Length, .8 mm., and 

 possibly more. 



This might easily be mistaken for the young of the preceding 

 species had it a pigmented skin, but I believe the young of N. 

 muscorum always show more or less of the bluish pigment dots 

 which are entirely absent in this species. The color is white, 

 with a yellowish cast. The buccal cone is sharp and projects as 

 far forwards as in N. muscorum ; while the antennae are rather 

 larger, comparatively, than in that species, though of the same 

 form. This is what we would expect in an albino species. The 

 presence of but four eyes instead of six is, however, the distin- 

 guishing feature, though not very easy of determination. N. 

 muscorum, when young has two eye patches on each side of the 

 head, but the front one always bears two ocelli. They are rare 

 and occur under sticks in damp places. 



