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Family 1: Pauropodidæ. 
Diagnosis . The head is quite free and uncovered; its upper 
side has four transverse rows of hairs which are rather regularly 
distributed over the surface, and the fourth row is arranged near 
the posterior margin. The trunk has six terga, all rather feebly 
chitinized; each of the five anterior terga is adorned with eight 
hairs or setæ arranged in two transverse rows and — with excep- 
tion of the first tergum — besides with one or generally two pairs 
inserted more laterally; no hairs are found outside the terga (with 
exception of a sublateral pair close to the head). The tactile setæ 
are inserted inside the lateral margins of the terga; the last pair is 
the longest. The anal segment is dorsally free, uncovered. The legs 
have the central claw moderately long or rather short with a prox- 
imal pad; the empodium has in front of the claw another claw with 
almost the whole lower margin clothed with a large pad, behind 
the central claw a free, distally rounded pad and a curved claw, 
which is smaller than the central one and almost rudimentary on 
the last pair of legs. 
Remarks. In the diagnosis I have embodied all the characters 
which I consider to be valid. When several forms of Eurypauro- 
podidæ have been studied much better than hitherto done, it will 
perhaps be possible to accept some other features, especially cha¬ 
racters from the legs, in the diagnoses of the families. I will add 
a more detailed mention of some of the structural features of this 
family. 
The dorsal surface of the head has four transverse rows of 
hairs. The first row has four hairs, and the same number is found 
in the third. In the second row I count only four hairs; outside 
the lateral hair is further observed a hair on the lateral margin of 
the head close in front of the eye, but this hair has often another 
shape (being generally thin, cylindrical and never strongly clavate) 
and as it also is placed on the lateral margin it cannot be in- 
cluded (it has been drawn in most, but not in all figures of the 
