700 Scolopendrella and its Position in Nature. [September, 
On comparing them with seven well preserved specimens from 
Bohemia, I find no differ- 
: j ence, except that our form 
- : has rather longer and 
slenderer antennze than 
any of the Bohemian 
specimens; the American 
cave individuals have uni- 
formly thirty-three joints, 
and the spaces between 
the nodes are longer than 
I P in the Bohemian ones, 
which have from twenty- 
one to thirty-two joints. 
We do not, however, re- 
gard this as a_ specific 
character in so variable 
SARS *): 
iy see —: ' f : 
oy d a genus as this, and it 
Neg ag N may be that out-of-door 
TF stent Ny . ae 
7) NY) forms may occur in this 
\ bic) ! e country with shorter and 
9 stouter antenne, like the 
\ Vp J European one. We fe- 
iS gard, then, our 5S. amert- 
i aT | YW : cana (no description pub- 
WE BY lished) as a synonym of 
S. inmaculata Newport. 
_Fia. 1.—Scolopendrella tmmaculata highly mag- The adj oining figure, 
et 
> 
Wy 
ho 
(J 
ee 
(? 
() 
Chu 
raraaneeenn eaten. 
\ — 
Et, 
} ( 
cen 
a 
LO ors 
Mt 
<. 
end of body, showing the caudal siylets; d,a Re drawn by Mr. Emerton 
, : f le 1 body, showing from the specimens from 
J > g with supplementary ‘ 
appendage. Emerton and Packard, del. White’s cave, Jr., with the 
details of the caudal appendages drawn with the camera from the 
Salem specimen, will represent this form, which is 5 mm. in length. 
Let us now look at theThysanurous features of the Scolopen- 
drella, and then compare it with the Myriopods, such as our 
common Lithobius. 
The structure of the head is exactly as in Campodea, the form 
of the epicranium being the same, having a well marked median 
suture, while the posterior edge of the clypeus is angular, the 
apex of the triangular edge meeting the epicranial suture, 45 
