﻿MELOLONTHID^E 
  OF 
  THE 
  UNITED 
  STATES. 
  261 
  

  

  Mexican 
  Boundary 
  survey. 
  The 
  club 
  of 
  the 
  antenna) 
  is 
  nearly 
  twice 
  as 
  long 
  as 
  the 
  

   stem 
  ; 
  the 
  abdomen 
  is 
  without 
  impression 
  ; 
  the 
  spurs 
  of 
  the 
  posterior 
  tibiae 
  are 
  free, 
  

   Ions, 
  flattened 
  and 
  obtuse. 
  

  

  '03 
  

  

  Group 
  XV. 
  (D). 
  

  

  Contains 
  some 
  of 
  the 
  smallest 
  species 
  of 
  the 
  genus 
  ; 
  they 
  are 
  of 
  an 
  oblong 
  elongate 
  

   form, 
  with 
  the 
  upper 
  surface, 
  at 
  least 
  of 
  the 
  thorax 
  and 
  base 
  of 
  the 
  elytra, 
  pilose 
  with 
  

   long 
  hairs. 
  The 
  head 
  is 
  small, 
  the 
  clypeus 
  concave, 
  broadly 
  margined, 
  and 
  rounded. 
  

   The 
  tips 
  of 
  the 
  mandibles 
  are 
  not 
  visible 
  in 
  a 
  state 
  of 
  repose 
  ; 
  the 
  last 
  joint 
  of 
  the 
  

   maxillary 
  palpi 
  is 
  slightly 
  oval 
  and 
  has 
  an 
  impression 
  on 
  the 
  outer 
  face. 
  The 
  thorax 
  

   is 
  slightly 
  narrowed 
  at 
  the 
  base. 
  The 
  last 
  segment 
  of 
  the 
  abdomen 
  is 
  short, 
  though 
  

   not 
  so 
  very 
  short 
  as 
  in 
  the 
  groups 
  XII, 
  XIII, 
  and 
  XIV. 
  The 
  spurs 
  of 
  the 
  posterior 
  

   tibiee 
  of 
  both 
  sexes 
  are 
  free, 
  long 
  flattened 
  and 
  obtuse, 
  though 
  slender. 
  On 
  account 
  

   of 
  the 
  small 
  size 
  of 
  the 
  mandibles 
  the 
  first 
  species 
  of 
  the 
  group 
  was 
  considered 
  as 
  a 
  

   distinct 
  genus 
  Trichesthes 
  by 
  Erichson, 
  but 
  Lacordaire, 
  considering 
  it 
  as 
  established 
  

   upon 
  insufficient 
  grounds, 
  has 
  properly 
  as 
  I 
  think, 
  suppressed 
  it. 
  Burmeister 
  retains 
  

   it 
  in 
  his 
  work 
  on 
  Lamellicornia, 
  but 
  with 
  an 
  addition 
  of 
  species 
  which 
  renders 
  it 
  

   unrecognizable. 
  

  

  54. 
  L. 
  tristis, 
  testacea, 
  elongato-oblonga, 
  eapitc 
  thoracequo 
  saturatioribus, 
  dense 
  grosse 
  punctatis, 
  longe 
  

   pilosis, 
  clypeo 
  integro 
  concavo, 
  thorace 
  postice 
  subangustato 
  elytris 
  confertim 
  punctatis, 
  baud 
  costatis, 
  

   breviter 
  pilosis, 
  pilis 
  longis 
  versus 
  basin 
  raris 
  intermixtis, 
  niargine 
  longe 
  finibriato, 
  pectore 
  longe 
  

   dense 
  villoso. 
  Long. 
  -47 
  — 
  - 
  56. 
  

  

  Melolonthu 
  tristis 
  Fabr. 
  Syst. 
  El. 
  2,168. 
  

  

  Mehlontha 
  pilosicollis 
  Knoch, 
  Neue 
  Beytr. 
  85, 
  tab. 
  3, 
  fig. 
  29. 
  Say, 
  Jour. 
  Acad. 
  Nat. 
  Sc. 
  Phil. 
  3, 
  243. 
  

  

  Harris, 
  Ins. 
  Mass. 
  Inj. 
  Veg. 
  2nd 
  ed. 
  28. 
  

  

  Trichesthes 
  pilosicollis 
  Er. 
  Ins. 
  Deutchl. 
  3, 
  658. 
  

  

  Triehestes 
  tristis 
  Blanch. 
  Cat. 
  Col. 
  Mus. 
  Paris, 
  141 
  : 
  Burm. 
  Lamell. 
  2nd, 
  358. 
  

  

  Middle 
  and 
  Southern 
  States, 
  abundant. 
  In 
  the 
  male 
  the 
  club 
  of 
  the 
  antennae 
  is 
  

   longer 
  than 
  the 
  stem, 
  the 
  middle 
  of 
  the 
  abdomen 
  is 
  broadly 
  concave, 
  the 
  penultimate 
  

   segment 
  has 
  an 
  acute 
  transverse 
  crest 
  at 
  the 
  middle, 
  and 
  the 
  margins 
  of 
  the 
  last 
  seg- 
  

   ment 
  are 
  slightly 
  elevated. 
  

  

  55. 
  L. 
  c 
  r 
  i 
  n 
  i 
  t 
  a 
  , 
  elongate, 
  testacea, 
  fortiter 
  punctata, 
  clypeo 
  concavo 
  rotundato, 
  capite 
  thoraceque 
  rufes- 
  

   centibus, 
  hoc 
  postice 
  angustato, 
  longe 
  villosis, 
  elytris 
  breviter 
  pubesceutibus, 
  pilis 
  longis 
  paucis 
  versus 
  

   basin 
  intermixtis, 
  niargine 
  finibriato; 
  pectore 
  longe 
  dense 
  villoso. 
  Long. 
  -5. 
  

  

  ? 
  Triehestes 
  crinita 
  Burm. 
  Lamell. 
  2, 
  2nd, 
  358. 
  

  

  Texas, 
  Mr. 
  H. 
  Haldeman. 
  This 
  species 
  agrees 
  with 
  the 
  preceding 
  in 
  sculpture 
  and 
  

   appearance, 
  but 
  the 
  body 
  is 
  longer, 
  cylindrical 
  in 
  the 
  male, 
  slightly 
  ovate 
  in 
  the 
  

   female 
  ; 
  the 
  thorax 
  is 
  more 
  narrowed 
  behind, 
  and 
  the 
  hairs 
  of 
  the 
  elytra 
  are 
  shorter 
  : 
  

   the 
  latter 
  character 
  is 
  noticed 
  by 
  Burmeister 
  but 
  the 
  former 
  is 
  omitted. 
  The 
  sexual 
  

   characters 
  are 
  precisely 
  the 
  same. 
  

  

  67 
  

  

  I 
  

  

  