409 
two posterior pairs of dorsal plates are more strongly chitinized 
portions in a tergum or tergal plate which is less thickened than 
the browmsh yellow parts, but yet tolerably marked off from the 
thinner membrane not only laterally but in front and behind; this 
large tergal plate corresponds to the tergum of the last pedigerous 
„segment" in Pauropus. The two pairs of thicker plates belonging 
to the segments with the sixth and seventh pairs of legs are parts 
of a similar tergum. But as to the plates corresponding to the 
fouith and fifth pairs of legs this structure is more obscure; the 
two pairs of plates corresponding to the second and third pairs of 
legs aie, as far as I could see, well separated from each other, 
each pair of plates being parts of a tergal plate of its own. Ha- 
vmg examined only one specimen I do not venture to lay much 
stress on the features described, but it seems to me that these 
eight pairs of dorsal brownish yellow plates are thickened portions of 
foui tergal plates, and that at least the first of these is divided into two 
Wga, while at least the two posterior large terga have been preserved. 
(I will not enter on the question if the original state may be as 
many doisal plates as pairs of legs or the structure found in Pau¬ 
ropus or Eurypauropus). — The pair of plates corresponding to the 
first segment without legs and the following segment with the first 
pair of legs has in all eight setæ, and this feature together with 
a partial transverse division show very clearly that these two pla¬ 
tes are homotype with the two following pairs together. The last 
segment of the trunk has an undivided plate with two pairs of 
setæ. It is very interesting that the upper surface of the trunk 
in Brachypauropus has exactly the same number of setæ (or 
hairs) as in the genus Pauropus, viz. thirty two pairs; with excep- 
ti°n of the P air of thin hairs situated just behind the lateral angles 
of the head all the setæ in Brachypauropus are strong, curved and 
stiff, while in the family Pauropodidæ they are very varying in 
shape, but never so strong or curved as in the Brachypauropodidæ. 
The anal segment is rather similar to that in Pauropus. — 
The first segment has on the ventral side rather near the median 
