MR. LUBBOCK ON THE THYSANURA. 
139 
The two varieties occur together. 
The body is covered by scattered hairs, which are longest on the posterior part of the 
back, where they have the appearance of a tuft. The terminal segment of the antenna 
is short, as in P. cursor. 
The structure of the antennae is enough to distinguish this species from any of those 
described by M. Nicolet ; nor can it be confused with the Smi/nthurus signatus of Temple- 
ton, which, as already mentioned, is a different species from the S. signatus of Fabricius, to 
which Mr. Templeton, as I consider erroneously, refers it. In many respects it approaches 
Mr. Templeton's S. viridis, which, again, I must consider to be erroneously identified with 
the S. viridis of Fabricius ; the antennae, however, are differently constructed, and the 
markings are not exactly the same. Rather in front of the antennae, and close to the 
middle line, is a double dark spot, which suggests the idea of ocelli. 
Length 05". Found in the latter part of November, December, and January, amoi 
leaves and under logs of wood, with the two preceding species. It is not only, however, 
of livelier colours than either of those, but also of more active habits, running freely, 
and jumping more lightly and gracefully. 
I have given myself the pleasure of naming tliis pretty little species after my kind friend 
Mr. W. Wilson Saunders, V.P.L.S., to whom I am under many and great obligations. 
The antennae closely resemble those of P. cursor, the proportions of the different 
segments being, indeed, almost exactly the same. 
The upper lip also (PI. XLVI. fig. 26) much resembles that of the preceding species. 
The margin is clothed with short hairs rather than teeth, and those at the middle are no 
5 
longer than the lateral ones. 
The mandibles have respectively six and five teeth ; in other respects they, as well as 
the maxillce and maxillary palpi, much resemble those of P. cursor, as also do 
The second pair of maxillce, which, however, have only one minute tooth. The margin 
is varied somewhat in different individuals, being occasionally almost straight, and in 
other cases more or less lobulated. 
The tongue is rounded and bilobed, having a slight notch in the middle. 
The lower lip is formed of two somewhat quadrate lobes, the outer angles being, if we 
may so say, rounded off, while the inner apical angle of each lobe is slightly produced. 
The organ has several tufts of hairs. The margins have no teeth. 
The three pairs of legs, and the respective segments of which they are composed, agree 
closely with those of P. cursor ; but the foot, though formed on the same type, differs 
in its details, resembling ft Buskii in some respects, and P. cursor in others. The 
outer claw agrees most with that of the former species, while the lower appendage 
follows that of the latter. Instead of the outer claw tapering to the extremity, it is 
rounded off, while the lower angle is produced into a small claw (PI. XLVI. figs. 31, 32). 
The lower appendage is rather thicker than in P. cursor, and the filament e is some- 
what shorter. There are, moreover, two minute spines on the posterior foot, which, 
however, in different specimens, differ somewhat in size and position, 
indeed, the smaller spine seemed to be absent. 
The small appendage attached to the ventral surface of the first abdominal segment 
vol. xxiii. 3 ° 
In some 
