1896.) Entomology. 841 
into copulatory organs, the anterior pair of the seventh segment, are in 
the Colobognatha entirely unmodified. Hence. we must suppose that 
either the legs or the function have migrated, in case we assume a 
common origin and attempt to homologize the copulatory legs in the 
two orders. The theory of migration, however, has no facts to support 
it, and would be equally fatal to the idea that affinity or the want of it 
can in the Diplopoda be inferred from the position of the copulatory 
legs. 
The fact that the Colobognatha have eight precopulatory legs is not 
new, but up to this time the whole eight have been supposed to belong 
to the first six segments. Both Latzel and Pocock® give the distribu- 
tion of these legs as in the second column. In reality the arrangement 
is that of the third column. 
Latzel. Siphonotus. 
First segment, First pair, First pair. 
Second segment, Second pair, Second pair. 
Third segment, Footless, Third pair. 
Third pair, Fourth pair. 
Fourth segment, | Fourth par. 
Fifth segment Fifth pair, Fifth pair, 
: Sixth pair. | 
: Seventh pair, Sixth pair. 
Fh pment, f Eighth pair, f Seventh pair. 
First copulatory, Eighth pair. 
e aganit, f Second sotlainte, f First copulatory. 
: Eleventh pair. n 
Bighth segment, | Hleventh pair. :f Seoond enpulatory 
My attention was first attracted to these facts while engaged in 
examining specimens of Siphonotus collected in Sierra Leone in Dec- 
ember, 1893. The creatures were abundant in decaying banana stumps 
in Freetow, and I secured a large quantity. Instead of curling up as 
nearly all the representatives the present order are accustomed to do 
when placed in alcohol, my specimens remained conveniently straight 
and pliable so that they could be mounted in alcohol or balsam and 
studied to advantage. Of the arrangement of the legs as here stated 
there can be no doubt. The drawings are mostly camera tracings made 
from preparations in balsam. In order to make sure of the condition 
in Polyzonium, the genus studied by Latzel, I cut animals in two hori- 
zontally, brushed away the internal structures and mounted in balsam. 
5 Mr. Pocock seems to have come to doubt this disposition, for he uses a “?” in 
front of his last statement on the subject.—Max Weber’s Reise, 
