﻿538 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  ments 
  very 
  short. 
  The 
  body 
  is 
  covered 
  with 
  overlapping 
  scales 
  as 
  in 
  Ophryastes. 
  

   The 
  ocular 
  lobes 
  are 
  well 
  developed. 
  

  

  As 
  remarked 
  above, 
  the 
  faciefc 
  is 
  very 
  different 
  from 
  Ophryastes; 
  had 
  it 
  not 
  

   been 
  for 
  this 
  I 
  should 
  not 
  have 
  separated 
  the 
  two, 
  as 
  the 
  corbels 
  of 
  the 
  hind 
  

   tibiae 
  are 
  in 
  this 
  group 
  in 
  a 
  transitory 
  condition, 
  and 
  differ 
  from 
  species 
  to 
  species. 
  

  

  Since 
  the 
  above 
  was 
  written, 
  species 
  have 
  been 
  described 
  in 
  which 
  

   there 
  are 
  two 
  rows 
  of 
  spines 
  upon 
  the 
  apex 
  of 
  the 
  hind 
  tibiae, 
  and 
  a 
  

   definite 
  suggestion 
  of 
  truncature. 
  In 
  spite 
  of 
  the 
  fact 
  that 
  the 
  appear- 
  

   ance 
  of 
  most 
  of 
  the 
  species 
  of 
  Tosastes 
  is 
  very 
  different 
  from 
  that 
  of 
  

   the 
  species 
  of 
  other 
  genera, 
  it 
  seems 
  impossible 
  to 
  lay 
  down 
  any 
  real 
  

   definition 
  of 
  the 
  genus. 
  The 
  characters 
  given 
  for 
  separation 
  must 
  

   all 
  be 
  considered, 
  and 
  considerable 
  allowance 
  made 
  for 
  variation. 
  

  

  In 
  general, 
  Tosastes 
  is 
  smaller, 
  the 
  elytra 
  much 
  more 
  inflated, 
  and 
  

   the 
  rostrum 
  not 
  deeply 
  sulcate. 
  

  

  The 
  proportions 
  of 
  the 
  ventral 
  segments 
  are 
  too 
  variable 
  and 
  too 
  

   nearly 
  those 
  of 
  Ophryastes 
  and 
  EujJagoderes 
  to 
  be 
  relied 
  upon. 
  

  

  Pierce 
  (1913, 
  pp. 
  373, 
  374) 
  uses 
  the 
  short 
  second 
  ventral 
  segment, 
  

   the 
  narrow 
  and 
  nonpubescent 
  third 
  tarsal 
  joint, 
  the 
  nontuberculate 
  

   sides 
  of 
  the 
  thorax, 
  and 
  the 
  laminate 
  tips 
  of 
  the 
  posterior 
  tibiae 
  for 
  

   separating 
  Tosastes 
  from 
  other 
  genera 
  of 
  the 
  group. 
  In 
  T. 
  coarctatus 
  

   Champion 
  the 
  pronotum 
  is 
  nearly 
  if 
  not 
  quite 
  as 
  wide 
  as 
  the 
  elytra 
  

   in 
  some 
  specimens 
  and 
  is 
  subtuberculate, 
  nearly 
  tuberculate 
  enough 
  

   to 
  be 
  confusing, 
  and 
  the 
  third 
  joint 
  of 
  the 
  anterior 
  tarsi 
  is 
  wider 
  than 
  

   the 
  second, 
  and 
  sometimes 
  bears 
  a 
  small 
  patch 
  of 
  what 
  appears 
  to 
  be 
  

   pubescence. 
  Some 
  species, 
  or 
  at 
  any 
  rate, 
  some 
  specimens, 
  of 
  both 
  

   Eupagoderes 
  and 
  Ophryastes, 
  have 
  spinules 
  more 
  or 
  less 
  well 
  developed 
  

   upon 
  the 
  apices 
  of 
  the 
  hind 
  tibiae. 
  

  

  While 
  the 
  genitalia 
  vary 
  from 
  one 
  species 
  to 
  another, 
  there 
  seems 
  

   to 
  be 
  no 
  good 
  genitalic 
  character 
  that 
  applies 
  well 
  enough 
  to 
  them 
  all 
  

   to 
  give 
  a 
  reliable 
  point 
  upon 
  which 
  to 
  base 
  the 
  separation 
  of 
  this 
  

   genus 
  from 
  the 
  others. 
  

  

  Keys 
  for 
  the 
  separation 
  of 
  the 
  species 
  of 
  Tosastes, 
  both 
  b}?" 
  external 
  

   characters 
  and 
  by 
  the 
  genitalia, 
  follow. 
  In 
  the 
  type 
  of 
  Tosastes 
  ovalis 
  

   Pierce 
  the 
  second 
  row 
  of 
  spines 
  on 
  the 
  apex 
  of 
  the 
  hind 
  tibia 
  is 
  present, 
  

   but 
  so 
  very 
  small 
  as 
  to 
  be 
  difficult 
  to 
  make 
  out 
  with 
  a 
  magnification 
  

   of 
  20 
  diameters. 
  Other 
  specimens 
  of 
  this 
  species 
  leave 
  one 
  in 
  doubt 
  

   as 
  to 
  the 
  presence 
  or 
  absence 
  of 
  spines 
  at 
  a 
  magnification 
  of 
  50 
  di- 
  

   ameters, 
  and 
  it 
  may 
  be 
  that 
  the 
  second 
  row 
  of 
  spines 
  is 
  lacking 
  in 
  

   these. 
  For 
  this 
  reason 
  the 
  use 
  of 
  this 
  character 
  has 
  been 
  avoided 
  in 
  

   the 
  key 
  as 
  far 
  as 
  possible. 
  

  

  KEY 
  TO 
  SPECIES 
  OF 
  TOSASTES 
  BY 
  EXTERNAL 
  CHARACTERS 
  

  

  1. 
  Elytra 
  with 
  acute 
  humeral 
  angles 
  2 
  

  

  Elytra 
  with 
  broadly 
  rounded 
  humeri 
  3 
  

  

  2. 
  Humeral 
  angles 
  prominent, 
  dentiform; 
  sides 
  of 
  pro 
  thorax 
  abruptly 
  

  

  constricted 
  before 
  the 
  base 
  coarctatus 
  Champion 
  

  

  