48 COLLEMBOLA OF MINNESOTA 



tion of the subsegments being, however, indicated by the whorls 

 of hairs. The large claw is simple, the smaller one is narrower 

 in the anterior legs than in the posterior ones. The terminal 

 lamellae of the saltatory appendage are narrow and pointed. Both 

 appear to have on the same side a row of fine teeth ; in fact 

 there are two rows on the under surface, which, being almost 

 always thrown either to one side or the other, give the appear- 

 ance of a symmetry." 



Evidently the species does not vary much, for the above de- 

 scription exactly fits my specimens. The sub-anal papillae bearing 

 the anal appendages, are hardly stouter than those of S. quadri- 

 Tiaculatus, fig. 10, but are rather squarer on the ends. The ap- 

 pendages are apparently of the same form as in that species. 

 The antennae, fig. 18, are slightly stouter than in S. aureus, es- 

 pecially the third segment. The mucrones is of the same type, 

 but not so minutely serrate as in either S. minutus or S. aureus. 

 The claws differ little from those of the former species. My 

 specimens reach i mm. in length. 



Some were taken under bark of a dead log, others from the 

 under side of chips in rather a damp place, where a stagnant 

 pond was drying up. Besides these from the southern part of the 

 state, it was found to be quite common under loose bark in the 

 region around Lake Vcrmillion, being frequently taken in com- 

 nany with S. quadrimaculatus. 



Sminthurus pruinosus Tullb. 

 PI. Ill, Figs. 14, 15. 



1871. Sminthurus pruinosus. Tullberg, Fort, ofver Sv. Podur. p. 145. 



1872. Sminthurus pruinosus. Tullberg, Sver. Podur. p. 34. PI. Ill, 15-16. 

 1890. Smynthurus f rontalis. Uzel, Thys. Bohem. p. 37. PI. I, 3 ; II, 3-5. 

 1893. Sminthurus pruinosus. Schott, Palnsarct. Collemb. p. 28. PI. II, 



13-16. 



I have a single specimen which I think belongs to this spe- 

 nes. Gathering from the various descriptions given, it seems 

 that it is a dark species; mine is very dark, greenish black above, 

 and lighter, somewhat violet below, as well as on the antennae, 

 except at their proximal ends, and on the entire furcula. The 

 legs are very light violet. On the back are a few lines and dots 

 of a light yellow color. The top of the head between the eyes 



