﻿iSpO,] 
  BOTAXICAI. 
  GAZETTE. 
  20I 
  

  

  ► 
  

  

  inconvenient 
  for 
  short 
  tongues 
  and 
  to 
  limit 
  the 
  place 
  of 
  pol- 
  

   len-contact 
  to 
  the 
  underside 
  of 
  the 
  visitor's 
  head. 
  The 
  broad 
  

   banner 
  is 
  folded 
  over 
  the 
  other 
  parts 
  and 
  is 
  held 
  tightl}' 
  bj'the 
  

   calyx-tube, 
  so 
  that 
  with 
  the 
  closely 
  approximated 
  wings 
  and 
  

   keel 
  it 
  makes 
  it 
  difficult 
  for 
  a 
  visitor 
  with 
  a 
  proboscis 
  shorter 
  

   than 
  II 
  mm. 
  to 
  reach 
  the 
  nectar. 
  

  

  The 
  flower 
  is 
  visited 
  for 
  nectar 
  by 
  Bombns 
  mnericanorum 
  

   F. 
  ^ 
  9 
  , 
  and 
  by 
  the 
  ruby-throated 
  humming 
  bird, 
  Trochilus 
  

   coliihris 
  L. 
  

  

  Cercis 
  Canadensis 
  L. 
  — 
  The 
  red-purple 
  flowers 
  cover 
  the 
  

   trees 
  beloi-e 
  their 
  own 
  leaves 
  and 
  those 
  of 
  other 
  trees 
  appear. 
  

   The 
  trees 
  can 
  then 
  be 
  seen 
  for 
  miles 
  and 
  must 
  attract 
  bees 
  

   from 
  afar. 
  The 
  stamens 
  are 
  distinct 
  and 
  not 
  firmly 
  enclosed 
  

   by 
  the 
  petals, 
  and 
  the 
  calyx 
  is 
  broad 
  and 
  shallow. 
  Accord- 
  

   ingly, 
  both 
  honey 
  and 
  pollen 
  are 
  accessible 
  to 
  small 
  and 
  

   little 
  specialized 
  bees, 
  like 
  Halictus. 
  

  

  Although 
  one 
  of 
  the 
  least 
  specialized 
  of 
  Legummosaj, 
  

   Cercis 
  shows 
  one 
  of 
  the 
  most 
  peculiar 
  sets 
  of 
  visitors— 
  the 
  

   effect 
  of 
  early 
  blooming. 
  Of 
  the 
  bees 
  with 
  abdominal 
  pol- 
  

   len-brushes, 
  which 
  are 
  very 
  fond 
  of 
  flowers 
  of 
  PapiHonaceoe, 
  

   Osmia, 
  which 
  flies 
  in 
  early 
  spring, 
  is 
  abundantrwhile 
  Meg- 
  

   achile, 
  which 
  flies 
  in 
  summer, 
  is 
  absent. 
  Later 
  blooming 
  

   species 
  are 
  visited 
  by 
  Megachile, 
  while 
  Osmia 
  is 
  absent. 
  

   Cercis 
  also 
  resembles 
  early 
  flowers 
  by 
  being 
  visited 
  only 
  by 
  

   fennales 
  of 
  Bombus, 
  while 
  many 
  flowers 
  blooming 
  in 
  sum- 
  

   mer 
  are 
  visited 
  by 
  the 
  males 
  and 
  workers. 
  Synhalonia, 
  and 
  

   Anthophora 
  also 
  as 
  far 
  as 
  I 
  have 
  observed, 
  is" 
  only 
  found 
  on 
  

   early 
  flowers. 
  If 
  Cercis 
  bloomed 
  in 
  summer, 
  I 
  should 
  ex- 
  

   pect 
  also 
  to 
  find' 
  Sphecidge 
  among 
  its 
  guests, 
  as 
  in 
  the 
  cases 
  

   of 
  Amorpha 
  and 
  Petalostemon. 
  The 
  flower 
  is 
  further 
  re- 
  

   markaBle 
  for 
  being^abundantly 
  visited 
  by 
  Colletes, 
  C. 
  m»- 
  

   qualis 
  being 
  more 
  common 
  on 
  it 
  than 
  on 
  any 
  other 
  flower 
  

   Known 
  to 
  me. 
  

  

  On 
  six 
  days, 
  between 
  April 
  21 
  and 
  May 
  5, 
  I 
  captured 
  the 
  

   following 
  visitors 
  : 
  ' 
  

  

  — 
  Hymenoptera 
  — 
  Afidce: 
  (i) 
  Apis 
  mellifica 
  L, 
  5 
  , 
  s. 
  and 
  

   ^- 
  pM 
  ab. 
  ; 
  (2) 
  Bombus 
  virginicus 
  Oliv. 
  9 
  , 
  s. 
  ; 
  (3) 
  B. 
  

   separatusCr. 
  $ 
  , 
  s. 
  and 
  c. 
  p.; 
  (4) 
  B. 
  vagans 
  Sm. 
  9 
  , 
  s. 
  ; 
  

   \^) 
  B. 
  americanorum 
  F. 
  9, 
  s., 
  ab. 
  ; 
  (6) 
  B. 
  pennsylvan- 
  

   icus 
  DeG. 
  9, 
  s., 
  ab. 
  ; 
  (7) 
  Anthophora 
  ursina 
  Cr. 
  ^9, 
  

   S-, 
  freq. 
  ; 
  (8) 
  Synhalonia 
  speciosa 
  Cr. 
  ^ 
  9 
  , 
  s. 
  and 
  c. 
  p., 
  

   7-; 
  (9) 
  S. 
  honesta 
  Cr. 
  ^ 
  , 
  s. 
  ; 
  (10) 
  Ceratina 
  dupla 
  Say 
  

   /' 
  S-; 
  (11) 
  Osmia 
  lignaria 
  Say 
  ^9, 
  s. 
  and 
  c. 
  p.; 
  

   ^'-) 
  0. 
  atriventris 
  Cr. 
  9 
  , 
  s. 
  and 
  c. 
  p.; 
  (13) 
  O. 
  albi- 
  

  

  