598 
MR. LUBBOCK ON THE THYSANURA 
The hairs are quite short and inconspicuous. The hasal segment of the antennae is 
shorter than the others, and the third is shorter, though scarcely so, than the second 
and fourth. The filaments are about half as long again as the basal part of the caudal 
appendage. 
I found this pretty little species, on a hot summer's afternoon, running about in great 
numbers on a gravel walk. 
Macrotoma. 
Macrotoma pltjmbea. (PL LIX. figs. 11-14.) Colour, with scales, leaden ; without 
them, yellow, with pale lateral markings on the mesothorax. Antennae longer than 
the body. Anterior abdominal segment a little narrower than those on each side of 
it ; fourth abdominal segment cylindrical, but more curved at the posterior margin 
than in Nicolet's figure. There is also a pale narrow line running down the back 
to the hinder end of the third abdominal segment. Legs hairy and scaly through- 
out, at least except the tarsus. 
One of the mandibles has five teeth, the other four. 
The three pairs of feet are very similar to one another, though in my specimens the 
extremity of the small claw seemed to be more elongated in the posterior foot (PL LIX. 
fig. 13) than in the other two. The tarsus is, as usual, provided with a tenent hair and 
two unequal claws. The tenent hair is large and strong. The larger, outer claw has 
three equidistant spines on the under margin. The lesser claw has a very small spine on 
the outer margin. 
The two branches of the caudal appendage have on their upper side, near the base, a 
row of about nine small, simple, black spines, the hindermost of which is affixed rather 
further from the side than the others (PL LIX. fig. 11). The largest spine is y^ooths of 
an inch in length, the diameter of the branch being at that place y^joths of an inch. 
Macrotoma minor, n. s. (PL LIX. fig. 15.) Like the preceding in general outline and 
colour ; it is, however, smaller. The antennae are shorter than the body, which, 
without the scales, is of a dull leaden colour. The anterior segment has the usual 
pale, oblong, elongated markings. The large claw at the extremity of the tarsus 
has six minute teeth on the under side. The black spines on the second segment 
of the saltatory appendage are much larger than in M. plumbea, and some have 
lateral projections. 
Under logs of wood, with M. plumbea, throughout the year. This species seems 
very indifferent to cold ; I found it common all through the winter, even during sharp 
frosts. 
The largest specimens are as much as ^th of an inch in length ; but the majority are 
smaller. 
The first abdominal segment is shorter than the two on each side. The mandibles have, 
respectively, four and five teeth. The processes at the end of the maxillae are not exactly 
like those of If. plumbea. 
The anterior feet have, besides the usual tenent hair, on the under side of the larsre 
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