﻿Bull. 
  23, 
  Biological 
  Survey, 
  U. 
  S. 
  Dept 
  of 
  Agriculture. 
  

  

  # 
  4 
  ♦ 
  ♦ 
  

  

  Plate 
  ||. 
  

  

  O 
  

  

  #•# 
  

  

  Seeds 
  of 
  Certain 
  Troublesome 
  Weeds 
  Eaten 
  by 
  Horned 
  Larks. 
  

  

  Fig. 
  A.— 
  Green 
  and 
  yellow 
  foxtail 
  (Chsetochloa 
  viridis 
  and 
  C. 
  glauca). 
  Fig. 
  B. 
  — 
  Amaranth 
  

   (Amaranthns 
  blitoides). 
  Fig. 
  C— 
  Sedges 
  (1, 
  Cj/perus; 
  2, 
  Scirpus; 
  3, 
  Carex; 
  4, 
  Rhyncho- 
  

   spora). 
  Fig. 
  D. 
  — 
  Bnr 
  clover 
  (Medicago 
  denticulata) 
  . 
  Fig. 
  E. 
  — 
  Napa 
  thistle 
  ( 
  Ceratatirea 
  

   nulitnixix). 
  Fig. 
  F.— 
  Corn 
  cockle 
  {Agrostcnnna 
  githago). 
  Fig. 
  G. 
  — 
  Button 
  weed 
  (Biodia 
  

   teres). 
  

  

  [A, 
  F, 
  G, 
  Magnified 
  4 
  times; 
  C, 
  D, 
  E, 
  magnified 
  twice; 
  B, 
  magnified 
  17 
  times.] 
  

  

  