﻿MEL0L0NTHID2E 
  of 
  the 
  UNITED 
  STATES. 
  273 
  

  

  modice 
  punctato, 
  brcvi, 
  ante 
  medium 
  valde 
  angustato, 
  lateribus 
  obliquis, 
  ad 
  medium 
  fere 
  angulatis, 
  

   angulis 
  posticis 
  obtusis, 
  subimpressis, 
  ad 
  apieem 
  marginato, 
  aDgulis 
  anticis 
  magis 
  aeutis, 
  elytris 
  fortius 
  

   punctatis, 
  tricostatis, 
  tibiis 
  anticis 
  tridentatis, 
  dente 
  ultimo 
  oblique 
  truneato, 
  unguiculis 
  medio 
  breviter 
  

   dentatis. 
  Long. 
  -45. 
  

  

  Yellowstone 
  River, 
  Nebraska, 
  Dr. 
  F. 
  V. 
  Hayden. 
  The 
  mandibles 
  are 
  very 
  pro- 
  

   minent^ 
  and 
  bent 
  at 
  the 
  apex 
  so 
  as 
  to 
  cover 
  the 
  ligula. 
  The 
  sides 
  of 
  the 
  thorax, 
  

   from 
  a 
  ventral 
  view 
  hardly 
  converge 
  towards 
  the 
  base. 
  The 
  punctures 
  between 
  the 
  

   smooth 
  lines 
  of 
  the 
  elytra 
  are 
  confused, 
  and 
  somewhat 
  rugous. 
  The 
  pygidium 
  is 
  

   coarsely 
  punctured 
  and 
  sparsely 
  hairy; 
  the 
  propygidium 
  is 
  more 
  densely 
  punctured, 
  

   with 
  the 
  usual 
  transverse 
  impression. 
  

  

  29. 
  D. 
  i 
  n 
  n 
  o 
  x 
  i 
  a, 
  oblonga, 
  convexa, 
  rufo-ferruginea 
  nitida, 
  capite 
  sat 
  dense 
  punctato, 
  clypeo 
  fere 
  herni- 
  

   hexagono 
  marginato, 
  sutura 
  frontali 
  profunda, 
  fronte 
  transversim 
  obsolete 
  elevata, 
  thorace 
  modice 
  punc- 
  

   tato, 
  brevi, 
  ante 
  medium 
  valde 
  angustato, 
  lateribus 
  ibi 
  obliquis, 
  dein 
  sequaliter 
  rotundatis, 
  angulis 
  posticis 
  

   obtusis 
  subimpressis, 
  ad 
  apieem 
  marginato, 
  angulis 
  anticis 
  aeutis, 
  elytris 
  fortius 
  punctatis, 
  tricostatis, 
  

   tibiis 
  anticis 
  obtuse 
  tridentatis, 
  dente 
  ultimo 
  subtruncato 
  unjraiculis 
  breviter 
  dentatis. 
  Long. 
  -4.' 
  

  

  One 
  specimen, 
  Kansas. 
  Closely 
  allied 
  to 
  the 
  preceding, 
  and 
  precisely 
  similar 
  to 
  it 
  

   in 
  sculpture: 
  the 
  body 
  is, 
  however, 
  not 
  at 
  all 
  ovate, 
  and 
  the 
  sides 
  of 
  the 
  thorax 
  are 
  

   more 
  regularly 
  and 
  less 
  suddenly 
  rounded. 
  These 
  two 
  species 
  by 
  the 
  strong 
  apical 
  

   marginal 
  line 
  of 
  the 
  thorax 
  form 
  a 
  passage 
  to 
  the 
  Rhizotrogi 
  ; 
  many 
  of 
  which 
  they 
  re- 
  

   semble 
  in 
  the 
  form 
  of 
  the 
  claws. 
  

  

  Species 
  not 
  recognized. 
  

   Diplotaxis 
  punctato-rugosa 
  Blanch. 
  Cat. 
  Col. 
  Mus. 
  Paris, 
  171; 
  Burm. 
  Laniell. 
  2, 
  2nd, 
  263. 
  

   Diplotaxis 
  g 
  e 
  o 
  r 
  g 
  i 
  as 
  Blanch, 
  ibid. 
  

   Diplotaxis 
  frondicolaj 
  Blanch, 
  ibid. 
  

  

  Diplotaxis 
  castanea 
  Burm. 
  Lamell. 
  2, 
  2nd, 
  262 
  ; 
  an 
  D. 
  sabcostata 
  ? 
  

   Diplotaxis 
  corpulenta 
  Burm. 
  ibid. 
  263. 
  

  

  Alobus 
  Lec. 
  

  

  Corpus 
  elongato-oblongum, 
  subcylindricum 
  : 
  caput 
  majusculuni, 
  clypeo 
  marginato, 
  antice 
  subrotundato, 
  

   sutura 
  frontali 
  bisinuata; 
  labrum 
  transversum 
  late 
  emarginatum; 
  palpi 
  maxillares 
  articulo 
  ultimo 
  tenui 
  

   cylindrico, 
  reliquis 
  coniunctis 
  sequali 
  ; 
  mandibula; 
  prominulas 
  ad 
  apieem 
  obtusae 
  : 
  mentum 
  quadratum 
  haud 
  

   impressum; 
  antennae 
  breves 
  10-artieulatae, 
  clavaparva 
  triphylla. 
  Tibiae 
  anticae 
  tridentatee 
  unicalcaratse, 
  pos- 
  

   teriores 
  tenues 
  haud 
  coronatae, 
  nee 
  ad 
  apieem 
  incrassatae, 
  posticae 
  intus 
  parce 
  pilosae 
  ; 
  tarsi 
  tibiis 
  vix 
  longiores, 
  

   subtus 
  parce 
  pilosi 
  vel 
  setosi, 
  haud 
  spinulosae 
  ; 
  ungues 
  omnes 
  dente 
  inferno 
  maximo 
  truneato, 
  ungue 
  ipso 
  haud 
  

   breviore. 
  Thorax 
  membranula 
  apicali 
  nulla. 
  

  

  A 
  genus 
  which 
  approaches 
  the 
  Rhizotrogi 
  in 
  another 
  direction, 
  viz., 
  by 
  the 
  

   absence 
  of 
  the 
  apical 
  membrane 
  of 
  the 
  thorax 
  ; 
  nevertheless 
  by 
  the 
  abdomen 
  and 
  by 
  

   the 
  labrum 
  it 
  must 
  clearly 
  be 
  associated 
  with 
  Diplotaxis. 
  

  

  A. 
  f 
  ul 
  v 
  u 
  s, 
  elongatus, 
  subcylindricus, 
  testaceo-rufus 
  nitidus, 
  capite 
  fuscescente, 
  confertim 
  punctato, 
  clypeo 
  

   vix 
  hemihexagono, 
  anguste 
  marginato, 
  sutura 
  frontali 
  impressa, 
  thorace 
  latitudine 
  plus 
  duplo 
  breviore, 
  

   dense, 
  medio 
  parcius 
  punctato, 
  antrorsum 
  haud 
  angustato, 
  lateribus 
  late 
  rotundatis, 
  angulis 
  posticis 
  ob- 
  

   tusis 
  ; 
  elytris 
  fortiter 
  punctatis, 
  subtricostatis, 
  propygidio 
  subtiliter, 
  pygidio 
  grosse 
  punctato. 
  Long. 
  -36. 
  

  

  One 
  specimen, 
  New 
  York. 
  The 
  three 
  teeth 
  of 
  the 
  anterior 
  tibite 
  are 
  near 
  together. 
  

  

  70 
  

  

  