282 SIR JOHN LUBBOCK ON THYSANURA. 
whip-like portion is divided into much more numerous subsegments, which towards the 
end become moniliform, have each a whorl of hairs, and fall into groups of seven, each 
group separated by a well-marked division. 
The larger palpi are six-jointed, the three basal segments point forwards, the third 
being smaller than the other two; the three terminal ones are recurved, and about as 
long as the two basal. In Templeton's figure only the first two segments point forwards ; 
and they are succeeded by a recurved many-jointed “ whip." This does not at all agree 
with my specimen. 
The lesser palpi are three-jointed ; the basal segment is shorter than the other two, 
which are nearly equal in length, the terminal one being somewhat swollen, though not 
so much so as in Templeton's fig. 1 d. 
Geoffroy describes the corresponding organs of his Forbicina teres saltatrix as two- 
jointed, another point in which it differs from M. polypoda. 
The feet are biunguiculate. | 
I do not find it observed by previous writers that each of the four posterior legs bears 
an appendage on the basal segment, closely resembling the eight anterior ventral appen- 
dages. Their presence appears greatly to strengthen the argument of those who regard 
these appendages as rudimentary legs. It is moreover peculiarly interesting, if we 
remember that the peculiar genus Scolopendrella has a very similar pair of appendages 
attached between each pair of legs except the first. 
In M. polypoda the anterior abdominal segment appears to want these appendages. 
In the following eight segments they are attached near the posterior margin, and are 
about equal in size, except the last, which is considerably larger than the rest. Between 
this last pair is a strong, straight, stiff appendage, which gradually tapers from the base, 
ending, however, abruptly. It is divided into about thirty subsegments, each with a 
whorl of stiff, short hairs. 
LEPISMA SACCHARINA Linn. 
Lepisma saccharina, Fauna Suec. ed. 2, No. 1925 ; Guérin, Icon. Ins. plate ii. fig. 2. 
Forbicina plana Geoff. Ins. 
Lepisma saccharina Gervais, Ins. Apt. iii. p. 451. 
Lepisma saccharina Temp. Trans. Ent. Soc. i. p. 92. 
Silvery white, with a yellowish tinge about the antennz and legs. 
Length 3 of an inch. 
Head free. Mesothorax and metathorax somewhat wider, but shorter, than the pro- 
thorax. Abdomen gradually tapering. 
Eyes black, remote. Antennæ long, tapering ; basal segment short, others numerous 
and still shorter; at some little distance from the base they become rather longer, and 
gradually divide into two subsegments. They are about two-thirds as long as the body, 
but are generally imperfect. 
The longer palpi are five-jointed. At the base are several stiff spines, bifurcate at the 
extremity. The mandibles consist of three parts :—1st, a fleshy rounded lobe ; 2nd, a 
pointed process, horny at the extremity; and, 3rd, the main part, provided with four 
strong teeth and a molar surface. 
