202 
Simon divides (op. cit.) the European forms of his. 
family Phalangiide into 2 sub-families: Sc/erosomatinæ 
and Phalangune; all the above mentioned genera 
belong to the lately mentioned group. Of the small 
group Sclerosomatine which consists of 3 European 
genera I have examined the Ist and 2d pair of legs of 
Mastobunus tuberculifer Luc. The proximal spiracle 
is hardly lying so close to patella, the distal one on 
the tibia of the 2d pair of legs, is placed hardly 1/3 of 
the length of the tibia from the apex close behind the 
distal of the 2 secondary articulations; the tibia of 
the 1st pair of legs is not quite half as long as the one 
of the 2d pair of legs, and the spiracle is even situated 
a little closer to the basis than to the apex. 
While thus the spiracles are pointed out in so many 
of the most divergent genera of the fam. Phalangioide 
W. Sor. (Phalangtide Sim.), they are completely wanting 
in /schyropsaloide, Nemastomoide, Troguloidce and 
Sironoidce, of which I have examined one species of each 
family, certainly not having dissected any specimen of 
the first and last one. Next they are wanting in Opi. 
Laniatores, of which | have examined both short and 
long-legged species of some families. Thus they are 
solely found in Phalangtotdce which typically have the 
longest and most slender legs of all Opiliones, and it 
is the only family of Opil. Palpatores, whose spiracles 
at the anterior margin of the abdomen are »hiantia« 
(W. Sor.), while in all other, closely examined forms 
they are »cancellata« or able to be closed in one way 
or another. (As to the spiracles in Opil. Laniatores 
I refer the reader to W. Sørensen (op. cit.) The exi- 
stence of supplementary spiracles becomes thus a family- 
character which may be added to the characters men- 
tioned by Sorensen (op. cit. p. 578). 
I shall not undertake to set forth an hypothesis 
