﻿NO. 
  1130. 
  XEW 
  SPECIES 
  OF 
  CHBYSOMELIDJ^—LIXELL. 
  477 
  

  

  appearance 
  is 
  farther 
  facilitated 
  by 
  a 
  depression 
  and 
  slight 
  emargiua- 
  

   tiou 
  of 
  tlie 
  edges 
  at 
  this 
  place, 
  the 
  serration 
  of 
  the 
  elytral 
  suture 
  being 
  

   interrupted 
  some 
  distance 
  behind 
  the 
  mesoscutellum 
  in 
  all 
  the 
  Chlamys 
  

   of 
  the 
  pi 
  leaf 
  a 
  group. 
  There 
  is, 
  however, 
  a 
  marked 
  individual 
  variation, 
  

   and 
  si)ecimens 
  occur 
  that 
  by 
  their 
  sculpture 
  evidently 
  belong 
  to 
  C. 
  mem- 
  

   nonia, 
  but 
  still 
  show 
  no 
  second 
  scutellum. 
  On 
  the 
  other 
  hand, 
  one 
  

   example 
  of 
  the 
  ordinary 
  G. 
  pUcata 
  has 
  been 
  observed 
  with 
  metascutel- 
  

   lum 
  visible. 
  Mr. 
  Jacoby^ 
  has 
  noted 
  this 
  variation, 
  but 
  nevertheless 
  

   transfers 
  C. 
  memnonia 
  to 
  Lacordaire's 
  genus 
  IHaspis, 
  founded 
  upon 
  a 
  

   Mexican 
  species, 
  I), 
  paradoxa, 
  which 
  was 
  the 
  oidy 
  coleopterou 
  recorded 
  

   with 
  two 
  seutella 
  previous 
  to 
  Mr. 
  Jacoby's 
  observation. 
  

  

  Another 
  structure 
  in 
  these 
  beetles 
  still 
  more 
  remarkable 
  for 
  its 
  varia- 
  

   bility 
  is 
  the 
  form 
  of 
  the 
  mesoscutellum. 
  In 
  C. 
  plicata 
  this 
  is 
  ordinarily 
  

   subquadrate, 
  slightl}^ 
  broader 
  behind, 
  with 
  acute 
  hiiid 
  angles 
  and 
  three 
  

   subequal 
  acute 
  teeth, 
  plainly 
  visible 
  in 
  front. 
  Occasional 
  specimens, 
  

   however, 
  occur 
  with 
  the 
  scutellum 
  as 
  much 
  as 
  one-half 
  broader 
  than 
  

   long. 
  In 
  C. 
  meinnonia 
  the 
  width 
  is 
  sometimes 
  more 
  than 
  twice 
  the 
  

   length. 
  The 
  lateral 
  teeth 
  are 
  deflexed 
  in 
  front 
  and 
  concealed 
  by 
  the 
  

   thoracic 
  lobes. 
  The 
  posterior 
  angles 
  are 
  rounded, 
  imparting 
  an 
  entirely 
  

   different 
  appearance 
  when 
  viewed 
  from 
  above. 
  Some 
  specimens 
  luive 
  

   the 
  scutellum 
  narrower, 
  with 
  the 
  teeth 
  more 
  visible, 
  in 
  which 
  case, 
  if 
  the 
  

   metascutellum 
  also 
  happens 
  to 
  be 
  concealed, 
  they 
  are 
  distinguishable 
  

   from 
  C. 
  plicaia 
  only 
  by 
  the 
  sculpture 
  of 
  thorax 
  and 
  elytra. 
  After 
  dili- 
  

   gent 
  search- 
  for 
  specific 
  characters 
  to 
  separate 
  the 
  specimens 
  with 
  

   two 
  seutella 
  obtained 
  at 
  Brownsville 
  and 
  San 
  Diego, 
  Texas, 
  from 
  those 
  

   taken 
  in 
  southern 
  Arizona, 
  1 
  have 
  reached 
  the 
  conclusion 
  that 
  all 
  

   belong 
  to 
  oue 
  variable 
  species, 
  namely, 
  Chlamys 
  memnonia 
  Lacordaire. 
  

   All 
  specimens 
  collected 
  by 
  Belfrage 
  at 
  Waco, 
  Texas, 
  that 
  I 
  have 
  seen, 
  

   are 
  C.pUeaia. 
  The 
  characters 
  for 
  C. 
  mem)\onia 
  may 
  be 
  summarized 
  as 
  

   follows: 
  

  

  Thorax 
  with 
  distinct 
  lateral 
  tubercle 
  and 
  scattered 
  coarse 
  punctures; 
  

   the 
  gibbosity 
  on 
  all 
  sides 
  rugosely 
  scabrous 
  and 
  deeply 
  bifid 
  at 
  sum- 
  

   mit. 
  Scutellum 
  generally 
  about 
  twice 
  broader 
  than 
  long 
  and 
  with 
  one 
  

   visible 
  lobe 
  in 
  front. 
  31etascntellum 
  exposed. 
  Elytra 
  with 
  acutely 
  

   elevated 
  tubercles, 
  the 
  four 
  in 
  the 
  humero-median 
  line 
  forming 
  a 
  sin- 
  

   uous 
  ridge, 
  connected 
  by 
  longitudinal 
  ridges 
  with 
  the 
  tubercle 
  on 
  the 
  

   basal 
  lobe 
  and 
  with 
  the 
  juxti 
  scutellar 
  tubercle, 
  including 
  a 
  deep, 
  

   round 
  velvety 
  black 
  fovea 
  on 
  the 
  disk 
  just 
  in 
  front 
  of 
  the 
  strong- 
  

   transverse 
  median 
  tubercle, 
  that 
  terminates 
  the 
  humero-median 
  ridge; 
  

   generally 
  there 
  is 
  another 
  similar 
  black 
  fovea 
  between 
  this 
  ridge 
  

   and 
  the 
  lateral 
  carina; 
  the 
  latter 
  is 
  strongly 
  developed 
  and 
  arcuate; 
  

   on 
  the 
  posterior 
  half 
  of 
  each 
  elytron 
  are 
  five 
  other 
  more 
  isolated 
  tuber- 
  

   cles. 
  The 
  intervals 
  are 
  finely 
  rugose 
  and 
  coarsely, 
  sparsely 
  punctured. 
  

   Pygidium 
  coarsely 
  reticulately 
  rugose. 
  Average 
  size 
  somewhat 
  larger 
  

   tluTu 
  C. 
  plicata. 
  

  

  1 
  Biol. 
  Cent.-Amer., 
  Ins. 
  Col., 
  YI, 
  Pt. 
  1, 
  p. 
  74 
  and 
  Snppl., 
  p. 
  155. 
  

  

  