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a\  With  a  long  stout  tail;  segments  polished  and  nearly  smooth ,  5th 
segment  of  the  leg  padded  in  d* .    .    Rhynchoproctus  proboscideus. 
b\  Without  a  long  tail;  densely  sculptured  dorsally;  4th  and  5th 
segments  of  legs  padded  in       .    .    .   Spirostreptus  vittatus. 
k  Ventral  grooves  long  and  deep;  distance  between  the  eyes  about 
equal  to  or  greater  than  the  long  diameter  of  an  eye.  Thyropygus. 
a2.  Tail  straight,  blunt,  its  apex  not  upcurled. 
a\  Tail  short,  just  surpassing  the  valves;  antennae  and  legs 
fuscous;  segments  black  not  bordered  with  red.    .  weberi. 
b\  Tail  long,  far  surpassing  valves,  legs  and  antennas  yellow, 
segments  posteriorly  banded  with  red.    .    .    .  pachyurus. 
b\  Tail  long,  slender,  pointed,  with  distinctly  upcurled  apex. 
a\  Antennae  and  legs  fuscous,  flavo-cingulate ,  the  posterior 
border  of  the  segments  not  red  or  yellow,  with  a  large 
blood-red  lateral  spot  on  each  side  behind  the  pore    .  . 
erythropleurus. 
b\  Antennas  and  legs  of  a  uniform  colour,  not  banded;  the 
segments  either  widely  or  narrowly  banded  with  red  poste- 
riorly, with  no  lateral  spot. 
a5.  Legs  and  antennas  entirely  fuscous,  the  segments  poste- 
riorly conspicuously  banded  with  red  .    .  rubro-cinctus 
bK  Legs  and  antennae  yellow  (the  former  sometimes  darker 
at  the  base  :  antennas  of  xanthurus  lightly  fuscous). 
a6.  First  segment  (in  9)  small,  laterally  angular  and 
without  grooves;  the  2nd  and  3rd  segments  very  large  ; 
the  latter  with  its  posterior  border  mesially  emargi- 
nate  dorsally;  with  a  red  median  dorsal  spot  upon 
the  posterior  half  of  the  segments    .    .  xanthurus, 
b\  First  tergite  in  Ç  wider  laterally  and  sulcate;  2nd  and 
3rd  segments  smaller. 
a\  The  anterior  half  of  the  segments  dorsally  finely 
punctulate  and  adorned  with  a  wide  flavous  patch 
which  spreads  on  to  the  posterior  half  of  the 
segments  as  a  red  spot;  red  border  of  segments 
very  narrow.  xanthonotus. 
b7.  Without  any  pale  dorsal  band;  the  transverse 
bands  on  the  border  of  the  segments  wide,  the 
anterior  half  of  the  segments  at  least  in  the  middle 
