340 
different in length. (In Eurypauropodidæ the hairs differ very 
much from this description). The tarsus has no seta on its lower side. 
At least in species with the posterior pairs of legs proportio- 
nally elongate the last pair of legs presents a sexual difference. 
In the male the empodium and especially the claw are considerably 
larger (pl. II, fig. 4) than in the eighth pair (pl. I, fig. 4 g) and 
in other pairs, while the difference is slight in the female; further- 
more the tarsus of the last pair is more elongated in the male 
and its upper margin sometimes more concave. In the short-legged 
Paur. vulgaris these sexual differences are slightly developed, but 
generally appreciable. Other sexual differences have not been observed. 
Specimens with eight pairs of legs are smaller than the adults, 
but most of the specific characters are similar and well developed. 
The essential differences between adults and specimens without the 
last pair of legs are the following. The upper antennal branch 
is proportionally a little shorter and thicker; the tactile setæ of 
the last (fourth) pair are proportionately a little shorter than the 
fifth pair in the adult, but in all respects more like the fifth than the 
fourth pair in the adult, while the third pair in the immature speci- 
mens. has not obtained the characteristic features (thickening etc.) 
as completely developed as in the adults. The last segment of the 
trunk has four pairs of setæ, while only three pairs are found in 
the adults, these having only one pair while immature specimens 
have two pairs between the tactile setæ. The anal segment has 
the usual dorsal and ventral setæ existing in the adults, moreover 
always a shorter lateral pair on the tergum rather near the base, 
and in. Stylopauropus pedunculatus (probably in all members of 
this genus) even a proximal submedian dorsal pair of long setæ. 
But with exception of these differenæes the adults and specimens 
with eight pairs of legs are alike in other respects, and I have 
therefore ventured to establish three of my new species on such 
immature specimens. — Specimens with seven or only with six pairs 
of legs I have not studied more closely, but it can be stated that 
the anal segment and especially the anal plate in such specimens 
