﻿296 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION, 
  

  

  ber 
  extends 
  westward 
  over 
  the 
  plateau 
  to 
  its 
  edge 
  and 
  down 
  the 
  slopes. 
  

   The 
  whole 
  edge 
  of 
  the 
  plateau 
  is 
  covered 
  with 
  forests 
  from 
  the 
  mount- 
  

   ains 
  in 
  New 
  Mexico 
  westward 
  and 
  northward 
  nearly 
  to 
  the 
  Colorado. 
  

   This 
  timber 
  belt 
  is 
  accompanied 
  on 
  its 
  northern 
  side 
  by 
  a 
  strip 
  of 
  vary- 
  

   ing 
  width 
  of 
  pasture 
  land, 
  extending 
  in 
  some 
  places 
  nearly 
  to 
  the 
  Colo- 
  

   rado 
  Chiquito. 
  

  

  From 
  the 
  edge 
  of 
  the 
  plateau, 
  the 
  country 
  falls 
  rapidly 
  towards 
  the 
  

   Gila 
  and 
  the 
  deserts 
  of 
  Lower 
  Arizona. 
  About 
  the 
  heads 
  of 
  the 
  Gila 
  

   there 
  are 
  many 
  groups 
  of 
  mountains, 
  most 
  of 
  which 
  are 
  timbered, 
  while 
  

   the 
  valleys 
  and 
  plains 
  are 
  well 
  grassed. 
  All 
  along 
  the 
  slope 
  of 
  the 
  Colorado 
  

   Plateau 
  the 
  country 
  is 
  broken, 
  timber 
  occupying 
  most 
  of 
  the 
  mountains, 
  

   while 
  the 
  valleys 
  are 
  grassy. 
  As 
  the 
  elevation 
  diminishes, 
  the 
  vegeta- 
  

   tion 
  changes 
  and 
  decreases, 
  and 
  when 
  we 
  reach 
  the 
  lower 
  levels, 
  we 
  

   meet 
  with 
  the 
  system 
  of 
  narrow, 
  parallel 
  ranges 
  and 
  valleys, 
  most 
  of 
  

   the 
  former 
  being 
  grass-covered, 
  or 
  possibly 
  crowned 
  with 
  a 
  few 
  scatter- 
  

   ing 
  trees, 
  the 
  latter 
  mainly 
  barren. 
  Of 
  this 
  description 
  is 
  the 
  country 
  

   along 
  the 
  Lower 
  Gila, 
  and 
  its 
  branches, 
  the 
  Colorado 
  and 
  Williams 
  Fork. 
  

   The 
  country 
  along 
  the 
  Mexican 
  boundary 
  in 
  Arizona 
  is 
  nearly 
  all 
  of 
  this 
  

   description, 
  though 
  improving 
  to 
  some 
  extent 
  from 
  the 
  longitude 
  of 
  

   Tucson 
  eastward. 
  

  

  The 
  Great 
  Basin 
  Area 
  and 
  the 
  Wasatch 
  Mountains. 
  

  

  This 
  region, 
  which 
  finds 
  no 
  outlet 
  save 
  evaporation, 
  comprises 
  por- 
  

   tions 
  of 
  the 
  following 
  States 
  and 
  Territories 
  : 
  Oregon, 
  Nevada, 
  Utah, 
  

   and 
  California 
  — 
  itself 
  one 
  great 
  basin, 
  it 
  comprises 
  a 
  number 
  of 
  smaller 
  

   ones, 
  which 
  may 
  be 
  classified 
  comprehensively 
  into 
  three, 
  namely 
  : 
  that 
  

   of 
  Harvey's 
  Lake, 
  Oregon 
  j 
  of 
  Salt 
  Lake, 
  Utah, 
  and 
  of 
  Carson-Hum- 
  

   boldt 
  Lakes, 
  Nevada. 
  

  

  The 
  characteristic 
  surface 
  feature 
  is 
  that 
  of 
  narrow, 
  parallel 
  ranges, 
  

   trending 
  nearly 
  north 
  and 
  south, 
  separated 
  by 
  narrow, 
  partly 
  -filled 
  val- 
  

   leys. 
  

  

  The 
  most 
  fertile 
  regions 
  of 
  the 
  basin 
  are 
  among 
  the 
  ranges 
  in 
  the 
  

   drainage 
  area 
  of 
  tributaries 
  to 
  Great 
  Salt 
  Lake, 
  in 
  Utah, 
  and 
  in 
  the 
  north- 
  

   ern 
  parts 
  of 
  Utah 
  and 
  Nevada. 
  

  

  Proceeding 
  now 
  to 
  the 
  drainage 
  area 
  of 
  Bear 
  Eiver, 
  one 
  of 
  the 
  largest 
  

   tributaries 
  of 
  Great 
  Salt 
  Lake, 
  we 
  find 
  that 
  its 
  valleys, 
  with 
  the 
  single 
  

   exception 
  of 
  the 
  upper 
  one 
  of 
  all, 
  that 
  which 
  extends 
  from 
  the 
  base 
  of 
  the 
  

   Uinta 
  Mountains 
  down 
  to 
  the 
  mouth 
  of 
  Smith's 
  Fork, 
  can 
  easily 
  be 
  burned 
  

   over 
  ; 
  that 
  the 
  ranges 
  of 
  hills 
  and 
  low 
  mountaius 
  which 
  separate 
  these 
  

   valleys 
  are 
  grass 
  -covered, 
  while 
  the 
  higher 
  ranges, 
  such 
  as 
  the 
  Bear 
  

   liiver 
  and 
  Wasatch 
  Kanges, 
  are 
  covered 
  with 
  a 
  somewhat 
  sparse 
  growth 
  

   of 
  timber. 
  

  

  The 
  upper 
  valley 
  of 
  the 
  Bear, 
  extending, 
  as 
  was 
  said 
  above, 
  from 
  the 
  

   base 
  of 
  the 
  Uinta 
  Range 
  northward 
  to 
  the 
  mouth 
  of 
  Smith's 
  Fork, 
  with 
  

   a 
  few 
  minor 
  interruptions, 
  is 
  clothed 
  only 
  with 
  a 
  sparse 
  growth 
  of 
  

  

  