384 
half  brunneo-piceous  with  ferruginous  border  and  with  an  almost 
obsolete  paler  spot  in  the  dorsal  middle  line,  caudal  process  and  mar- 
gins of  valves  flavous. 
Head  and  face  smooth  and  shining,  marked  above  with  a  vertical 
sulcus  and  the  ordinary  transverse  series  of  strias;  labral  margin  with 
about  6  punctures;  eyes  separated  by  a  distance  greater  than  a  dia- 
meter, composed  of  about  55  ocelli.  Antennae  moderately  long ,  reaching 
beyond  the  collum  but  not  so  far  as  the  hinder  border  of  the  second 
somite. 
Somites  smooth  and  shining  ;  collum  somewhat  small,  narrowed  laterally 
almost  to  a  point,  its  anterior  margin  defined  by  a  sulcus  as  high 
as  the. eye,  otherwise  not  sulcate;  the  second  somite  wide  and  long, 
much  wider  than  the  collum  and  laterally  stretching  below  it;  the 
third  somite  also  very  wide  and  long  but  not  so  wide  as  the  second, 
its  upper  surface  posteriorly  widely  and  deeply  emarginate  ;  the  4*h ,  5th 
and  6*  becoming  gradually  like  the  rest  of  the  series;  the  rest  marked 
with  complete  transverse  groove,  the  anterior  half  concentrically 
striated  in  front,  the  posterior  half  longitudinally  striated  below  nearly 
as  high  as  the  pores;  pores  minute  situated  just  behind  a  sinuation 
of  the  sulcus;  ventral  grooves  long,  about  twice  as  long  as  wide,  and 
about  as  long  as  the  two  basal  segments  of  the  legs.  Anal  somite 
produced  above  into  a  slender,  pointed,  apically  upcurled  process 
which,  continuing  the  line  of  the  dorsum,  projects  beyond  the  anal 
valves';  anal  valves  convex,  with  margins  also  convex  and  strongly 
compressed  throughout;  sternite  posteriorly  angled  and  fused  with  the 
preceding  sclerite. 
'  Number  of  somites  62;  length  about  125  mm.;  width  of  face  by 
eyes  6  mm.;  of  second  somite  10  mm,  of  sixth  somite  7.5  mm. 
tf.  (Young)  with  61  somites,  measuring  1 13  mm.;  antennae  stretching 
to  the  end  of  the  second  somite,  which  is  not  enlarged;  anal  valves 
posteriorly  black;  copulatory  feet  not  fully  developed. 
83.  Thyropygus  erythropleurus ,  sp.  n.  Pl.  XXI,  fig.  6-6b. 
Sumatra:  Manindjau  and  Muka  Muka. 
Colour  (in  alcohol);  head  piceo-olivaceous ,  ferruginous  inferiorly; 
antenna*  of  the  same  colour  as  the  head,  very  narrowly  flavo-annulate  ; 
legs  fuscous,  flavo-annulate,  the  distal  extremities  of  the  segments 
being  flavous,  somites  anteriorly  olivaceo-cinereous  ;  posteriorly  piceous 
