COLLEMBOLA OF MINNESOTA 67 



Isotoma leonina Pack. 

 PL IX, Figs. 1-4. 



1873. Isotoma leonina. Packard, Synopsis of the Thys. of Essex Co., 



Mass. Fifth Report Peabody Acad. Sci. 

 1896. Isotoma leonina. MacGillivray, The Amer. sp. of Isotoma. Canad. 



Ent. XXVIII. 



Light tawny yellow, the young nearly white. Ground color 

 whitish, pretty uniformly spotted with rather coarse brown 

 specks. A remarkably long, slender species with body some- 

 what sparsely covered with short hairs, except on Abd. V, where 

 they are long. The head is rather longer than broad and square 

 in front. Antennae less than twice the length of the head; Ant. 

 II much curved, slightly longer than I, which is equal to III, 

 IV longest of all. Claws without teeth or tenent hairs. Fur- 

 cula long and slender, though shorter than usual in the genus, 

 extending beyond body by a distance about equal to greatest 

 breadth of abdomen ; when pointed forwards it reaches the ven- 

 tral tube. Dentes about twice as long as the manubrium, becom- 

 ing very slender at distal end. Mucrones much curved, tri- 

 denticulate ; apical tooth distant from the second, and making 

 a prominent curve; second and third vertical, the latter (prox- 

 imal) slightly the shorter of the two. Eyes on a conspicuous 

 black patch, ocelli 16. Post-antennal organ broadly elliptical. 

 Length, 2.^^ mm. Under bark of stranded pine logs along the 

 Mississippi River, not very abundant. 



Isotoma sensibilis TuUb. 

 PI. IX, Fig. 20. 



1876. Isotoma sensibilis. Tullberg, Coll. Borealia. p. 36. PI. IX, 23-26. 



1894. Isotoma sensibilis. Schott, Paleearct. Collemb. p. 72. PI. VI, 31-32. 



1895. Isotoma sensibilis. Renter, Finlands Collembola. 



The original description may be rather freely translated 

 as follows : "Hairy, Abd. Ill and IV about equal in length. An- 

 tennae slightly longer than the head. Ant. Ill shorter than II. 

 the Mucrones bears three teeth inserted one after the other. On 

 the anterior pair of tibiae two clavate hairs, on the posterior 

 tibiae, three. Length, 2 mm." 



The post-antennal organ is broadly elliptical. The species 

 is slender, blue-gray or greenish gray in color. Manubrium very 



