COLLEMBOLA OF MINNESOTA 81 



1847. Tomocerus lepida. Nicolet, Mem. Soc. Ent. France. 



1871. Tomocerus niger. Lubbock, Monogr. Coll. and Thys. p. 139. 



1871. Macratoma vulgaris. Tullberg, Fort, ofver Sv. Podur. p. 149 



1876. Macrotoma vulgaris. Tullberg, Coll. Borealia. p. 31. 



1882. Tomocerus vulgaris. Brook, Some little-known Coll. etc. p. 22 PI. 



I, 15-19- 



1890. Macrotoma vulgaris. Uzel, Thys. Bohemise. p. 47. 



1893. Tomocerus vulgaris. Schott, Palaearct. Coll. p. 41. 



1895. Tomocerus vulgaris, Reuter, Finl. Coll. och Thys. p. 15. 



1895. Tomocerus niger. Reuter, Finl. Coll. och Thys. p. 15. 



1896. Tomocerus vulgaris. Schaffer, Coll. v. Hamburg, p. 204. 



1897. Tomocerus vulgaris. Poppe & Schaffer, Coll. v. Bremen, p. 27-1 



Bourlet describes the species as follows : "Same length 

 as the preceding (T. plumbeus) as to body and antennae ; body 

 covered with black scales, showing to the unaided eye a slightly 

 silvery reflection. The body denuded of scales waxy yellow 

 (Jaune de cire), anterior border of the thorax garnished with a 

 fringe of short, black hairs ; antennae gray or fawn-gray ; feet of 

 a greenish-brown, tarsi brown, ventral side yellowish." 



Tullberg, whose description of this species as M. vulgaris. 

 has been generally accepted in lieu of Bourlet, says : "Anten- 

 nas not longer than the body. 12 to 16 simple spines on the 

 dentes. Greater claw armed with 4-6 teeth, lesser claw blunt, 

 lanceolate. Length, 4 millim." I have seen no other record 

 of this species having been taken in America, and am not cer- 

 tain but that it may be an exotic species as it has only been 

 taken in the green-house of the University, where it is rather 

 common. It differs from our common out-door species, T. 

 arcticus, in the number and arrangement of the spines on the 

 dentes, which range from 12 to 16, being more numerous than 

 in the above-named species. Another difference is that the 

 distal spine of T. niger is always much larger than the two pre- 

 .ceding. while in T. arcticus it is the second or ante-distal which 

 is large. The mucrones also differs considerably in the first two 

 (proximal) teeth, which are placed almost opposite each other 

 and at some distance from the end of the dentes in T. arcticvis ; 

 while in T. niger they are less prominent, and close upon th<. 

 heel of the mucrones. The antennas differ somewhat from that 

 figured for T. arcticus in that Ant. I is shorter and stouter as 

 compared with Ant. II. 



