183 
and comparatively small spiracles are placed in the 
sides of the triangle and are only overlapped so much 
that the immovable chitine of the sternite projects enough 
to make their apertures turn towards the median plan 
of the animal. The structure in Cleobis Cube is almost 
similar to that in Solpuga, the spiracles, however, 
diverge respectively much lesser and are relatively much 
longer, about half the length of the sternite. 
D. About the Systematism of the Order. 
Of older authors, having published svstematical 
contributions of any importance, may be mentioned C. 
L. Koch and L. Dufour (op. cit.). The above mentioned 
work of Simon, published in the year 1879, marks a 
great systematic progress; a large material (with a 
number of new forms) afforded to him the means of 
valuing the characters pointed out by older authors, and 
of finding several new ones, leading him also to establish 
several new genera. Next year Karsch published his 
above mentioned paper; he promises (p. 228) »neue 
Gesichtspunkte« but — besides some synonymic, the 
establishing of 4 new genera and several new species 
— it strikes me that there is nothing new but his 
pointing out the importance of the number of joints in 
the tarsi of the 2d and 3d pair of legs, which Simon 
has neglected to state. The author says besides p. 234: 
»nach dem Ergebnisse der vorausgegangenen Unter- 
suchungen ist die Zeit der Schöpfung einer natürlichen 
Eintheilung doch lange nicht reif; es ist noch viel zu 
wenig bekannt, und das Bekannte noch viel zu ober- 
Nlächlich erforscht«, and in this point he is undoubtedly 
quite right. After this paper only a few new genera 
and species have been described, but not one has tried 
to arrange the now rather numerous genera in groups. 
