COLLEMBOLA OF MINNESOTA 89 



Lepidocyrtus aenescens n. sp. 



A blue species with five white cross-bands. Antennae en- 

 tirely white, legs the same, down to the distal end of the tibiae, 

 beyond that pale. Mantibrium tinted but slightly with blue, 

 dentes with a pale yellowish cast. Mesothorax massive, pro- 

 jecting but slightly over base of head. Antennae short and stout, 

 hardly longer than the head. Ant. IV about equal to the two 

 preceding segments. Ant. Ill shorter than II. Dorsal parts 

 rather heavily scaled in life, but the scales apparently loosely 

 fastened, as they are very often absent in preserved specimens. 

 The scales are of a light brown color, the blue of the body is 

 rather blackish, and presents more of a granular appearance than 

 in L. purpureus or L. pusillus, where the pigment is more uni- 

 formly spread. In general form, the three species are much alike. 

 The same figures of mucrones and claw would answer for all, 

 yet the species seems distinct from all yet described in the blue 

 tibiae, the entirely concolorous dark blue antennae, head entirely 

 blue, blue manubrium, presence of "basaJdorn" on mucrones, 

 and the white cross-bands on the body. Not that it is unique in 

 the possession of any one of these characters, but in their combi- 

 nation. Length, 1.25 mm. One of our commonest collembolan 

 forms. Found under sticks and stones throughout the summer. 



Achorutes boletivorus Pack. 

 Plate X, Figs. 13, 14. 



1873. Achorutes boletivorus. Packard, Thys. Essex Co., Mass. 



"A much smaller species than A. nivicola, being about half 

 the size, with a rather thicker body, and the head a little smaller 

 in proportion to the body. Antennae shorter, the joints shorter, 

 sub-spherical, terminal joints ovate, much shorter than in the 

 other species. Eyes conspicuously black. Legs proportioned 

 same as in A. nivicola, ending in long, sharp claws ; elater as 

 well developed as in A. nivicola. Pale gray above with a slight 

 greenish tinge, on the under side of the body lined with white, 

 with scattered gray specks on side of body. Supra-anal spines 

 rather longer than in A. nivicola. Length, .O5-.O7 inch. Sept. 10, 

 very abundant on under side between lamellae of Boleti and 



