192 DIPLOPODA. 
f'. Smaller, length about 33 mm.; anterior crest of keels almost straight; 
phallopod short, with its principal branch barely as long as the palmar 
portion, its distal portion gradually incurved and a little upcurled 
apically; auxiliary branch quite short and directed obliquely upwards. 
e'. Body more convex and compact, the keels being narrowed, more sloped 
and less widely extended, the anterier border never widely extended 
beyond the convex curve of the anterior crest; legs and antenne 
shorter. 
g. Posterior border of most of the keels very strongly convex at the 
base and inclining forwards and outwards at least from the 5th to 
the 10th segments, with the posterior angle obtuse; sterna strongly 
emarginate, wider in front than behind; phallopod with hairy 
portion of distal segment conical when viewed from below ; the 
principal branch longer than the palmar portion, slightly sinuous 
both from the inferior and lateral aspects, a little upcurled apically ; 
auxiliary branch half the length of the palmar portion, slender 
and directed nearly straight forwards . . . . . . 
g'. Posterior border of keels nearly straight or convex throughout or at 
the base, but at most only a little inclined forwards, and then the 
posterior angle is directed siightly backwards and is not obtuse; 
sterna rarely markedly emarginate. 
h. Distal segment of phallopod loug, attenuated; the principal branch 
about as long as the palmar portion, but straight and not incurved 
at the extremity, although upcurled at the tip; auxiliary branch 
short, with slight upward inclination, about one-third the length 
of the palmar portion, its apex falling considerably short of the 
commencement of the smooth terminal portion of the principal 
branch; prozonites pale, metazonites brown; body compact, 
stout; keels sloping, with anterior ridge straight, posterior 
border lightly sinuous and the angle slightly produced ; sterna 
not emarginate . . 2. 6. 1 ee eee ee ee 
h’. Principal branch of phallopod either abruptly or gradually incurved, 
arcuate or sinuous; auxiliary branch longer, its apex in no case 
much behind the point where on the principal branch the hairs 
cease and the smooth part begins; anterior crest on keels sinuous, 
the curvature often sigmoid ; prozonites brown, at least 
posteriorly, and the same colour as the adjacent area of the 
metazonites, the latter being usually brown in front, sometimes 
brown all over (? in Ft. montezume). 
i. Keels quite small, low, and sloping, with the posterior border 
strongly convex and defined by a pronounced basal noteh ; 
posterior angle obtuse, rounded, not pointed even on the 18th 
segment; lateral edge strongly thickened, with the pore lying 
far back; phallopod with the principal branch turned inwards, 
then forwards, sinuous in profile, and upturned apically, a little 
salvini. 
totanacus. 
attemsi. 
