BRISTLE-TAILS AND SPRING-TAILS. 103 
more or less thickly clothed by clubbed hairs. Antenne long, 
six-jointed. Eyes six in number on each side, arranged in the 
form of an S. (One or two beautiful species live about Salem.) 
Degeeria Nicolet. Segments of the body unequal in size, more 
Fig. 27. or less thickly clothed by clubbed hairs. An- 
tenn longer than the head and thorax, filiform, 
four-jointed. Eyes eight in number, on each side 
of the head. (Two species are figured on PI. 1, 
figs. 2-5. Fig. 27 represents a species found in 
Salem, Mass., closely allied to the European D: 
nivalis. Fig. 28, head of a Degeeria, showing 
the parts of the head. Five species are already 
known in New England.) 
Seira Lubbock. Body covered with scales. 
Antennæ four-jointed; terminal segment not 
ringed. Eyes on a dark patch. Thorax not 
projecting over the head. Abdominal segments 
Degeeria. unequal. 
Templetonia Lubbock. Segments of the body subequal, clothed 
by clubbed hairs, and provided with scales. Antennz longer than 
the head and thorax, five-jointed, with a small basal segment, and ` 
with the terminal portion ringed. 
Isotoma Bourlet (Desoria Nicolet). Four anterior abdominal 
segments subequal, two posterior ones small ; body clothed with 
simple hairs, and without scales. Antenne four- Fig. 28. 
jointed, longer than the head; segments sub- 
equal. Eyes seven in number on each side, 
arranged in the form of an S. (Three species 
are found in Massachusetts, one of which is 
figured on Pl. 1, figs. 6, 7.) 
Tomocerus Nicolet. Abdominal segments une- 
qual, with simple hairs and scales. Antenne 
very long, four-jointed, the two terminal segments 
ringed. Eyes seven in number on each side. (The European F. 
plumbea Linn., Podura plumbea of authors, is one of our most 
common species. Fig. 29, greatly enlarged, copied from Temple- 
ton; fig. 30, side view, see also fig. 31, where the mouth-parts are 
greatly enlarged, the lettering being the same, md, mandibles ; 
mæ, maxille ; mp, maxillary palpus; lb, labium ; lp, labial palpus ; 
Ic, lacinia; g, portion ending in three teeth ; l, lobe of labium ; sp, 
Head of Degeeria. 
