COLLEMBOLA OF MINNESOTA 43 



extension of the mouthparts allies it rather to Neanura from 

 which it differs in the transverse slit-like opening of the mouth. 

 We have the single species of the genus. granaria, 102. 



Sminthurus aureus Lubb. 

 PI. V, Figs. 5-9. 



1862. Smynthurus aureus. Lubbock, Notes on the Thysanura. In Trans. 

 Linn. Soc. Part II, p. 589. PI. 59, f. 1-3. 



1872. Sminthurus aureus. Tullberg, Sver. Podur. p. 2,2. 



1873. Smynthurus aureus. Lubbock, Monogr. Coll. and Thys. p. 112. PI. 



VII and LXIII, 9. 

 1890. Smynthurus aureus. Uzel, Thys. Bohem. p. 31. 

 1893. Sminthurus aureus. Schott, Pal^earct. Collemb. p. 31. 

 1896. Sminthurus aureus. Schaffer, Collemb. v. Hamburg, p. 208. 

 1896. Sminthurus aureus. Lie-Pettersen, Norges Collemb. p. 10. 



Lubbock's description is as follows : "Yellow with black 

 eyes. Antennae four-jointed; basal segment shortest, terminal 

 segment longer than the other three. Under side of body pale, 

 saltatory appendage white. Body with a few scattered hairs, 

 which are longer and more numerous toward the posterior ex- 

 tremity. The four segments of the antennae increase in length 

 progressively from the base to the apex, each being about twice 

 as long as the preceding. The long apical segment has whorls 

 of short hairs, but no distinct evidence of segmentation. The 

 eyes are situated as usual on a black ground, and near the cen- 

 tral line, a little in front of the antennae, is a black double spot 

 which looks like the seat of two ocelli. The two claws are simple. 

 The feet are also provided with four or five tenant hairs. 



"Length, 1/30 of an inch. Common from February to June 

 under dead pieces of wood in Kent." 



My specimens were taken in December, March and April, 

 tmder leaves and boards, in places which were slightly moist and 

 somewhat light. In all important respects they agree with Lub- 

 bock's description. In color, however, they exhibit a variation 

 noted neither by Lubbock nor Tullberg. Many of the young 

 specimens up to a half a millimetre in length, ?how an olive tint- 

 ing on the back which often extends even to the antennas, and but 

 few of those measuring three-fourths of a millimeter had entirely 

 lost the olive on the back. My largest specimens measure i mm. 



