1895.] Entomology. 1113 
Both pairs of legs of seventh segment of males replaced by copula- 
tory organs. 
Segments of adults 40-50. 
Among these characters some are especially noteworthy : 
The ocelli are many times larger than those of other Diplopoda, and 
the small number should not be looked upon as an indication that any 
reduction or coalescence has taken place, such as sometimes occurs in 
cave or subterranean forms. 
The lingual laminze of males are as large and as long as the stipes of 
the gnathochilarium, and are transversely striate. To accommodate 
these large laminz the promentum is greatly reduced, but in the female 
the promentum is larger and the lamin correspondingly shortened. 
The eight-jointed legs are quite different in form from those of any 
other group of Diplopoda. Seven joints is the number in the other 
suborders, although the second joint is always very short and in some 
case is nearly or quite obsolete. The second joint in Stemmatoiulus is 
also small, though larger than in any other Diplopod, and the addi- 
tional joint is probably the result of an articulation in last tarsal joint 
which in other forms is undivided. 
In males the second pair of legs is conspicuously reduced and trans- 
formed into a pair of hooks probably of use in copulation, 
Behind this second pair of legs is inserted an attenuate, apparently 
two-jointed, external seminal duct which lies back between the cox of 
the third and fourth pairs of legs, which are medianly hollowed out to 
receive it, as the drawings show. No such structure has been found in 
other recent Diplopoda, but the Carboniferous Archipolypoda as de- 
scribed and figured by Scudder show a probably homologous feature 
described by Scudder as an “ intromittent organ.” The copulation of 
Stemmatoiulus has not been observed, but as the creatures have the- 
usual copulatory legs on the seventh segment it seems more reasonable- 
to suppose that in Stemmatoiulus, at least, the function of the structure 
in question is to convey the seminal matter to the copulatory organs. 
The pleurz are neither free after the manner of Glomeris and 
Siphonotus, nor coalesced and obsolete asin Iulus and Polydesmus, but 
are anteriorly more or less adnate to the scuta, and posteriorly separ- 
ated by a deep incision, Compared with those of the Oniscomorpha 
and Colobognatha the pleure of Stemmatoiulus are very small, which, 
suggests the possibility that the pleure of Iulus have been lost, and 
have not so completely disappeared by mere coalescence. 
The segments are provided with eight setz each, instead of six as in 
Craspedosomatide, and they rise from punctations instead of tubercles, 
76 
