4-38 MR. LUBBOCK ON THE THYSANURA. 
The basal part gradually tapers to the extremity, which is sparingly clothed with short 
hairs, but has no trace of the three long, button-bearing hairs which occur in Smynthurns 
Bmkii. The terminal segment is, as usual, free from hairs ; it scarcely tapers, but is 
simply rounded off at the end. On the inner side are from 25 to 35 small teeth, of uniform 
size ; between the two last is a rounded knob, which occupies the space of about three 
teeth, but does not project beyond the general outline. 
The ventral tentacles are very similar to those of S. Buskii They are provided with 
the same gland-like papilla?, and fulfil doubtless the same functions. 
Papirius Saundersii, n. s. Body globular, without a re-entering angle. The great ab 
dominal segment is produced backwards, so that the two terminal segments are not 
seen when the animal is in its natural position. The penultimate segment is small, 
and only distinguishable on the ventral side. 
Variety a.— Head yellowish, with a tinge of green on the posterior part, more or less 
distinct brownish markings on the central line, and a curved patch of the same colour 
behind the antennae; eye-disk black. Back greenish, mottled with brown: the size as 
well as the darkness of the markings varies in different specimens ; but the fundamental 
pattern is generally the same, though the proportions of the parts may differ considerably. 
On each side of the median line on the anterior half of the abdomen is a more or less 
interrupted band ; about the middle of the back (that is to say, at their lower extremity) 
these are joined on the outer side by a diagonal band, and the two on each side unite, then 
separate and pass outwards and backwards, soon however returning again to the middle 
line, and thus enclose a more or less quadrate, or circular, space of the paler colour. In 
the middle line, and at the posterior end of the great abdominal segment or segments, is a 
marking which is very characteristic. There is first of all a small dark square, immediately 
behind which are three oblongs of the same colour, and at the posterior end a dark band 
passing backwards. The pale spaces between the oblongs vary in width, and sometimes 
are almost obliterated. The oblongs also vary in length, sometimes increasing gradually 
in length from the front one, like the steps of a pyramid, while at others the two last, or 
all three, are of equal length. 
In different specimens I found every shade between brown and dirty olive-green, while in 
some the light ground preponderated over the darker markings, and in others the reverse 
was the 
Sometimes the darker parts were of a beautiful purple 
The Sl des of the body, and the two basal segments of the antennas, are of the dark hue, 
whatever that may be, with, however, a few spots of lighter colour. 
The two apical segments of the antennae were purple in all my specimens, which struck 
me as a very curious fact, since I should have expected that the antennae would have 
followed the law of colouring which prevailed on the other parts of the body. 
I he posterior segment of the abdomen, the spring, the whole underside of the body, 
and the legs are pale, the latter with a tinge of red. 
Variety b.-~The dark parts more extensive, and very dark brown or purple. This 
variety is at hrst sight so different from the former, that, until I compared the nature of 
tLie markings and the structure of the different organs, I supposed that it was a different 
