26 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 113 
edge of sides of segments set off by a well-defined vertical submarginal 
sroove; interzonal furrow also broad and distinct down the sides. 
DESCRIPTION OF HOLOTYPE (originally preserved dry, later placed in 
alcohol, at present both gonopods and segment 11 are missing): 
Length indeterminate; width of body at segment 6, 8.2 mm.; seg- 
ment 9, 8.3 mm.; segment 12, 8.1 mm.; depth of segment 9, 5.4 mm.; 
the W/D ratio thus 65 percent and indicative of depressed paranota. 
Head, especially the frontal region, strongly convex, evenly so to 
the edges, genae likewise convex and swollen, with only a vaguely 
defined median depression. Labral setae about 14-16, clypeal setae 
about 16-18, the series not continued onto the genal margins. Labral 
teeth small and blunt. No cranial setae, or their sockets, present. 
Interantennal isthmus broad (about 1.6 mm.), twice the length of the 
first antennal article. 
Antennal sockets unusually broad and deep for a xystodesmid 
species, due partly to the strong convexity of the genae. Antennae 
long (6.5 mm.) and slender, extending caudad to middle of third 
tergite, sparsely setose, articles in decreasing order of length, 6—2-3- 
4—5-1-7. Sensory cones four, small, seventh article without sensory 
areas, its marginal setae curving mesad over the sensory cones. 
Collum broad, as wide as segment 2, the caudal margin nearly 
straight, anterior margin broadly convex, the lateral ends strongly 
depressed and descending, surface smooth and very finely tubercu- 
late. Anterior marginal ridge distinct up to level of the mandibular- 
cranial articulation. 
Paranota of segments 2-4 not swept forward, but distinctly trans- 
verse, descending, the tergites smooth except for scattered micro- 
tubercules; peritremata of these and other segments not completely 
set off—the submarginal groove not attaining the caudal edge of the 
paranota—so that a smooth raised peritremal area is continuous 
with a similar one along the caudal edge, enclosing a somewhat 
coriaceous, slightly impressed, discal paranotal area. 
Scapulorae marginal laterally, but the outer edge curves strongly 
caudal upon meeting the body cylinder before curving cephalad to 
join the interzonal furrow. Pores located at midlength of peritremata, 
on the dorsal side. Interzonal furrow very faint, almost obliterated 
across dorsum (the prozonite and metazonite thus meeting at a com- 
mon level), but becoming a broad shallow groove down the sides and 
across the sternites. Surface of prozonites very finely shagreened 
or smooth, surface of metazonites finely granular-coriaceous, surface 
of paranota coriaceous with the wrinkles oriented longitudinally. 
Paranota from about segment 10 gradually swept caudad, becoming 
increasingly angular with the peritremata larger and more conspicuous. 
Paranotal lobes of segment 18 acutely triangular, those of segment 19 
