﻿PACKAEDJ 
  THE 
  STOUT 
  PINE-BORER. 
  803 
  

  

  ing 
  beyond 
  the 
  coxse 
  of 
  the 
  first 
  legs. 
  It 
  is 
  larger, 
  more 
  bulky 
  than 
  

   the 
  aciiilt. 
  Length, 
  0.22 
  inch. 
  

  

  The 
  beetle 
  (Plate 
  LXX, 
  Fig. 
  4) 
  is 
  cylindrical, 
  with 
  the 
  head 
  and 
  pro- 
  

   thorax 
  together 
  three-fourths 
  as 
  long 
  as 
  the 
  rest 
  of 
  the 
  body 
  ; 
  end 
  of 
  

   the 
  abdomen 
  suddenly 
  truncated, 
  slanting, 
  forming 
  a 
  scoop, 
  the 
  decliv- 
  

   ity 
  smooth, 
  concave, 
  and 
  bounded 
  by 
  high 
  walls, 
  which 
  are 
  four-toothed 
  

   on 
  each 
  side, 
  the 
  third 
  from 
  the 
  top 
  the 
  largest. 
  On 
  each 
  wing-cover 
  

   are 
  eight 
  lines 
  of 
  fine, 
  raised 
  tubercles 
  ; 
  prothorax 
  with 
  concentric 
  rows 
  

   of 
  fine 
  tubercles, 
  but 
  smooth 
  on 
  the 
  posterior 
  third. 
  Seen 
  from 
  beneath, 
  

   the 
  wing-covers 
  project 
  well 
  beyond 
  the 
  end 
  of 
  the 
  abdomen. 
  Color, 
  

   pale 
  tan-brown, 
  a 
  little 
  paler 
  on 
  the 
  thorax 
  than 
  on 
  the 
  wing-covers. 
  

   Body 
  covered 
  with 
  stifi", 
  dense 
  hairs. 
  Length, 
  0.20 
  inch. 
  

  

  The 
  Stout 
  Pine-Borer, 
  Dendroctonus 
  obesus 
  Mannh. 
  (Plate 
  LXX, 
  

  

  Fig. 
  16.) 
  

  

  This 
  beetle 
  is 
  not 
  uncommon 
  in 
  Colorado. 
  I 
  met 
  with 
  it 
  at 
  Blackhawk 
  

   and 
  at 
  Manitou. 
  It 
  probably 
  bores 
  in 
  the 
  pines 
  and 
  spruces 
  of 
  the 
  mount- 
  

   ains. 
  It 
  is 
  short 
  and 
  stout, 
  reddish-brown, 
  the 
  head 
  and 
  prothorax 
  

   smooth 
  and 
  shining, 
  though 
  finely 
  punctured, 
  while 
  the 
  wing-covers 
  are 
  

   coarsely 
  punctured 
  and 
  dull-colored, 
  being 
  a 
  little 
  darker 
  than 
  the 
  rest 
  

   of 
  the 
  body. 
  Length, 
  0.35 
  inch. 
  

  

  It 
  scarcely 
  differs 
  from 
  the 
  Dendroctonus 
  terebrans 
  of 
  the 
  Eastern 
  

   States, 
  which 
  I 
  have 
  found 
  in 
  all 
  stages 
  in 
  great 
  abundance 
  under 
  the 
  

   bark 
  of 
  the 
  white 
  pine, 
  associated 
  with 
  Fissodes 
  stroM. 
  It 
  mines 
  the 
  

   inner 
  surface 
  of 
  the 
  bark, 
  slightly 
  grooving 
  the 
  sap-wood, 
  and 
  pupates 
  

   in 
  April, 
  appearing 
  as 
  a 
  beetle 
  in 
  great 
  numbers 
  on 
  warm 
  days 
  early 
  in 
  

   May. 
  On 
  a 
  cursory 
  examination 
  I 
  am 
  unable 
  to 
  see 
  any 
  difference 
  be- 
  

   tween 
  the 
  eastern 
  species 
  and 
  B. 
  obesus, 
  except 
  that 
  the 
  latter 
  is 
  slightly 
  

   larger. 
  

  

  INJURING 
  DECIDUOUS 
  SHADE 
  AND 
  ORNAMENTAL 
  TREES. 
  

  

  The 
  following 
  beetles 
  are 
  common 
  in 
  Colorado 
  and 
  the 
  Rocky 
  Mount- 
  

   ains, 
  and 
  in 
  most 
  cases 
  will 
  probably 
  be 
  foumi 
  ere 
  many 
  years 
  to 
  be 
  

   injurious 
  to 
  the 
  trees 
  in 
  towns 
  and 
  on 
  farms. 
  Knowing 
  as 
  yet 
  nothing 
  

   of 
  their 
  habits 
  I 
  have 
  thought 
  it 
  well 
  to 
  select 
  a 
  few 
  of 
  the 
  more 
  com- 
  

   mon 
  species 
  and 
  present 
  such 
  figures 
  and 
  brief 
  descriptions 
  of 
  them 
  as 
  

   may 
  prove 
  useful 
  to 
  western 
  gardeners 
  and 
  farmers 
  hereafter. 
  I 
  will 
  

   not 
  attempt 
  to 
  coin 
  English 
  names 
  lor 
  them. 
  The 
  localities 
  are 
  given 
  

   in 
  the 
  List 
  of 
  Coleoptera 
  collected 
  by 
  me 
  in 
  Colorado, 
  at 
  the 
  end 
  of 
  this 
  

   report. 
  

  

  Prionus 
  EMARaiNATUS 
  Say. 
  (Plate 
  LXX, 
  Fig. 
  6.) 
  

  

  "Body 
  castaneous; 
  head, 
  thorax, 
  and 
  breast 
  covered 
  with 
  long 
  yellow- 
  

   ish-ferruginous 
  hair 
  ; 
  antennae 
  fourteen-jointed, 
  glabrous, 
  perfoliate, 
  im- 
  

   bricate; 
  the 
  imbrications 
  emarginate 
  beneath 
  ; 
  mandibles 
  black 
  at 
  tip 
  ; 
  

   thorax 
  but 
  slightly 
  margined, 
  one-toothed 
  on 
  the 
  middle 
  of 
  the 
  lateral 
  

   edge; 
  angles 
  obtusely 
  rounded 
  ; 
  elytra 
  somewhat 
  unequal, 
  punctured 
  ; 
  

   feet 
  and 
  venter 
  subglabrous. 
  Length 
  nearly 
  seven-tenths 
  of 
  an 
  inch. 
  

   Female 
  glabrous 
  ; 
  antennse 
  simjile. 
  Length 
  four-fifths 
  of 
  an 
  inch. 
  This 
  

   species 
  exhibits 
  the 
  general 
  form 
  of 
  hrevicornis, 
  but 
  the 
  thorax 
  is 
  pro- 
  

   l^ortionally 
  much 
  narrowed, 
  and 
  the 
  characters 
  above 
  detailed 
  prove 
  it 
  

   to 
  be 
  very 
  distinct 
  from 
  that 
  species. 
  The 
  lepaceous 
  processes 
  of 
  the 
  

   antennae 
  are 
  so 
  profoundly 
  emarginate 
  beneath 
  as 
  to 
  appear 
  each 
  bilo- 
  

   bate. 
  I 
  obtained 
  it 
  on 
  the 
  Arkansas 
  River 
  near 
  the 
  mountains." 
  — 
  (Say,) 
  

  

  