SEEDEDE ST EET UNE 
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ag EET 
BORES TET ARE Er Rod D LEES 
409 
two posterior pairs of dorsal plates are more strongly chitinized 
portions in a tergum or tergal plate which is less thickened than 
the brownish 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 
fourth and fifth pairs of legs this structure is more obscure; the 
two pairs of plates corresponding to the second and third pairs of 
legs are, as far as I could see, well séparated from each other, 
each pair of plates being parts.of a tergal plate of its own. Ha- 
ving 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 
four tergal plates, and that at least the first of these is divided into two 
torga, 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 dorsal 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- 
tion of the pair 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 
