24 
seventh, and about six from the apical joint, two of which are 
much longer than the rest. — First four joints of the upper 
antennae of the male (fig. 3) stouter than the rest, the fourth 
swollen and bearing six or eight setae, penultimate joint very 
short, last joint bearing four short terminal setae. Inferior 
antennae (fig. 4) bi-articulate, bearing a short secondary branch. 
Lower foot-jaw (fig. 5) weak, chelate, terminal claw slender 
and slightly curved. First pair of feet (fig. 6) two-branched, 
both branches tri-articulate, and of nearly equal length ; 
terminal joints the longest, basal joint of the inner branch 
hearing round its distal margin a spinous fringe ; terminal 
joint scarcely twice as long as the middle one, and armed 
with one short and one very long apical seta, the middle joint 
having one seta at its apex ; the terminal joint of the outer 
branch has two long but unequal apical setae, one strong spine, 
and on the outer margin two short and one rather longer 
spine ; the preceding joints are armed with a similar arrange- 
ment of spines. Inner branch of second pair of feet (fig. 7) 
uni-articulate, with two long and equal apical and several 
shorter marginal setae. Third and fourth pairs of feet (fig. 8) 
longer, but in other respects nearly similar to the second ; the 
arrangement of the setae of the inner branch is, however, 
slightly different ; the outer branches of the second, third, 
and fourth pairs are three-jointed, the middle joint in the 
second pair is, however, much shorter than the others, while 
in the third and fourth pairs the last two joints are long and 
nearly equal, the first being the shortest. Fifth foot laminar 
composed of two segments (fig. 9), each of which is fringed 
with long ciliated setae. Terminal abdominal segments short ; 
tail-setae finely plumose, more than half the length of the 
body. The lower border of the last abdominal ring between 
the two caudal segments (fig. 10) is strongly pectinated. 
Eyes wanting (?). Length (exclusive of tail-setae), T ‘ T th of 
an inch. 
Habitat. Roof of the low main, West Cramlington Colliery, 
near Newcastle. 
The credit of the discovery of this species is due to my 
friend Mr. Thomas Atthey, of Gosforth, who kindly forwarded 
to me specimens, both living and mounted for the micro- 
scope. 
