2 
PLA TYRRHACIDA£. 
upon each other so as to enclose a median space ; the shorter anterior (dorsal) 
ramus is moreover not conspicuously flattened or expanded. .... 
Copulatory legs with basal hairy portion of the last joint very narrow and 
slender, nowhere broader than the ungual portion at the base of the first 
(lateral) division, which is long, slender, at first nearly straight, and almost 
perpendicular to the basal part of the joint; the mesial ramus is at first flat 
and rather broad, crosses its fellow, and near the apex is again divided, the 
three branches being short, subequal and divaricate; Genus Psaphodesmus, 
type Ps. concolor (Peters), Moti. 
Copulatory legs with hairy basal portion of last joint conspiculously thicker 
and broader than distal horny part. ........ 
Body rather slender, and with the carinse rather remote ; dorsum scarcely 
convex, nearly smooth, or indistinctly granular laterad ; carinse with lateral 
margins entire or faintly sinuate ; corners rounded, the posterior produced 
only on posterior segments ; pores removed from the margin by more than 
the width of the poriferous ring: Genus Leurodesmtis, type L sumatranus 
(Peters). 
Body robust and with the carinse adjacent, or the dorsum distinctly convex 
and distinctly granular ; carinse with lateral margins dentate, incised, or the 
posterior corner distinctly angled or produced on middle segments ; pores 
variously located. ............ 
Last segment subtriangular, the apex distinctly narrowed and produced ; 
two prominent setiferous tubercles near the longitudinal middle of the dorsal 
surface of the segment; carinse with anterior margin straight, evenly and 
distinctly dentate ; anterior corner of canna prominent, sharply angled or 
with a distinct and prominent tooth ; lateral margin distinctly and evenly den- 
tate ; posterior corner produced on middle and posterior segments into a spur- 
like process which projects caudad but not laterad beyond the general line of 
the lateral margin ; dorsum strongly convex ; first segment ecarinate ; copula- 
tory legs not approximate, conic, rather short, branched immediately above 
the hairy basal portion ; terminal rami subequal in length, the posterior nearly 
straight, the anterior turned mesad to meet its fellow and decurved so that 
the apex is nearly in contact with the base; Genus Mniodesmus, typed/??. 
crossotus, sp. n.y Java. 
Last segment broad and subquadrate, the apex not narrowed ; truncate or 
very broadly rounded ; setiferous tubercles not prominent, and not remote from 
the posterior margin ; carinse v/ith anterior margin somewhat rounded and en- 
tire, or straight, with very numerous fine irregular teeth ; anterior corner 
rounded and without a prominent tooth or angle ; lateral margin sparsely and 
irregularly dentate, sinuate or subentire ; posterior corner slightly produced or 
with a large spur-like process projecting caudad and laterad beyond the ante- 
rior part of the lateral margin ; dorsum slightly or moderately convex ; first 
segment more or less carinate, that is, with a more or less developed lateral pro- 
cess ; copulatory legs more or less approximate, the anterior ramus not re- 
curved 
Transverse constriction (suture) costulate (crenulate) ; pores adjacent to the 
margin ; lateral margins of carinse sparsely and irregularly dentate and appa- 
rently deeply excised, from the fact that the long spur-like process of the pos- 
terior corner extends laterad as well as caudad ; carinm rather narrow, about 
one-third as wide as the body-cylinder; dorsum with three distinct though in- 
conspicuous rows of tubercles: Genus Xerodesmus, type X, drains, sp. n., Java. 
