MESOPOTAMIAN AND PERSIAN MYRIAPODS. 169 
Yet the sete are differently shaped. Generally speaking they are more 
slender and longer in ponticus than in lagurus ; fig. 4 and 5 show the differences 
in the corresponding sets of the head (A and B), of the dorsal rows of the ter- 
gites (C and D) and of the pleural plumes (E). Quite striking are the set of 
the posterior marginal row of the tergites; these are blade-like, with parallel 
margins, and are neatly arranged side by side in a single line. The sete of 
the anterior-marginal rows of the tergites are comparatively shorter and more 
numerous, The hooked trichomes of the anal bunches are much (almost one 
half) shorter than the central brush-like setz; they show two to five apical 
lobes, as in lagurus ; the five-lobed trichomes appear to be less numerous than 
the fewer-lobed ones, the contrary being witnessed in lagurus. 
Enzeli (N. W. Persia); VI, 1919. 
Whether this is Lignau’s true ponticus has still to be ascertained. The Rus- 
~ sian author (Die Myriopoden der Pontus-Kiisten von Caucasus. Odessa, 
1903, p. 131 of the German summary) only announces the description to appear 
in a later work and states that the new species is to be known from lagurus 
through the structure of the antennz, the setz of the anal bunch and other 
particulars (?). Although no difference could be detected in the antenne 
(the proportions of which are similar to those indicated by Latzel), it may be 
assumed that the Persian specimens are specifically similar to those of the Cau- 
casus considering the vicinity of the localities. 
EXPLANATION OF PLATES. 
Fig. 1.—Strongylosoma persicum, H. & S. 
The left vulva from above. o=operculum ; F=hinges ; 
ev, tv=outer and inner valve ; c=ridge 
erated. Fig. 2—Strongylosoma persicum, H. & S. 
The left vulva from without. Same lettering as fig. 
l 1, plus: ov= oviduct. 
{ Fig. 3—Strongylosoma persicum, H. & S. 
Male copulatory leg. 
Fig. 4—Polyxenus ponticus (Lign.) nob. 
. Differently shaped sete: A and B, from the head; C, 
sees from the anterior-marginal rows of the tergites ; 
D, from the posterior-marginal row of same; E, 
from the pleural plumes; F and G, from  unascer- 
L tained parts of the body and not observed in lagurus. 
