598 MR. LUBBOCK ON THE THYSANURA. 



The hairs are quite short and inconspicuous. The basal 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 plumbea. (PI. 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 mth 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 (PI. LIX. fig. 11). The largest spine is j^ths of 

 an inch in length, the diameter of the branch being at that place jo-ooths of an inch. 



Macrotoma minor, n. s. (PI. 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 31. 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, fotir and five teeth. The processes at the end of the maxillae are not exactly 

 like those of M. ])lui)ihea. 



The anterior feet have, besides the usual tenent hair, on the under side of the large 



