59 
1921-22.] Myriapods from Mesopotamia and N.W. Persia, 
close resemblance of the two forms, has evidently to be traced back to 
environmental influences. 
‘‘ Amara on Tigris, under clod, 13 ii. 1918 ” (an immature male). 
“Garden above^ Amara, 3 iii. 1918” (an adult male and an immature 
female). 
Lithohius fossipes, n. sp. 
Adult male; length, 17 mm.; breadth of the 3rd tergite, 1'40 mm.; 
of the 8th, T60 ram 
Body indistinctly^ tapering anteriorly. Cephalic plate as long as broad, 
rounded, with a thick posterior marginal pad. Tergites and sternites 
smooth and shining ; marginal pads of tergites thin, interrupted dorsaily 
on the 5th and the 7th; posterior margin of the large tergites scarcely 
emarginate, that of the 14th perfectly straight ; angles of the 9th, 11th, 
and 13th tergites not produced. 
Antenna? 31-jointed ; long seta? are scarce on the ten basal joints and 
more numerous on the following ones. Ocelli few, disposed in three rows ; 
1+4, 3, 2. Coxosternal plate of maxillipedes (fig. 4) produced and armed 
with 2 + 3 moderate and acute teeth ; no lateral spines. Coxal pores small, 
3, 4, 4, 3. 
Tarsi of all legs two-jointed. Spinal armature of legs thus : — 
1st pair 
0 
. 0 , 
nip. 
a p. 
a 
0 
. 0 
p. 
amp. 
2nd and 3rd pairs 
o 
. 0 . 
mp. 
a p. 
a 
0 
. 0 
p. 
amp. 
am 
4th to 8th pair 
0 
. 0 
■ mp. 
a p. 
a p 
0 
. 0 . 
mp. 
amp. 
am 
9 til to 11th pair . 
o 
. 0 
. amp. 
a p. 
a p 
0 
. 0 . 
mp. 
amp. 
am 
12 th pair 
0 
. 0 . 
, amp. 
P' 
_ P 
0 
. o . 
mp. 
amp. 
am 
13th and 14th pairs 
in 
. 0 . 
, amp. 
P- 
_P 
0 
. m . 
amp. 
amp. 
am 
15th pair 
ra 
. 0 . 
amp. 
0 
. m . 
amp. 
amp. 
A coxolateral spine on the 15th pair; none on the 14th. Claw of the 
anal pair double. The fourth joint of the telopodite of anal legs (flg. 5) is 
by no means swollen, but its dorsal surface is depressed and furrowed ; 
the corresponding joint of the 14th pair is scarcely flattened and without 
any special structure. 
