﻿266 
  Mr. 
  R. 
  C. 
  L. 
  Perkins 
  on 
  

  

  2. 
  (5) 
  Three 
  cubital 
  cells 
  in 
  front 
  wings. 
  

  

  3. 
  (4) 
  kSeventh 
  dorsal 
  segment 
  of 
  ^ 
  without 
  a 
  longitudinal 
  median 
  

  

  carina; 
  ? 
  with 
  or 
  without 
  distinct 
  abdominal 
  bands; 
  

   if 
  these 
  are 
  present 
  the 
  face 
  is 
  black. 
  . 
  . 
  Anthophora. 
  

  

  4. 
  (3) 
  Seventh 
  segment 
  of 
  the 
  S 
  with 
  a 
  distinct 
  median 
  carina; 
  

  

  $ 
  with 
  banded 
  abdomen 
  and 
  yellow-marked 
  face. 
  

  

  Saropodu. 
  

  

  5. 
  (2) 
  Two 
  cubital 
  cells; 
  S 
  antennae 
  very 
  long. 
  . 
  . 
  Eucera. 
  

  

  6. 
  (1) 
  Face 
  of 
  (J 
  either 
  without 
  yellow 
  markings 
  or 
  if 
  with 
  these, 
  

  

  the 
  tarsal 
  claws 
  have 
  a 
  bltint, 
  truncated 
  * 
  basal 
  tooth 
  ; 
  

   $ 
  without 
  a 
  scopa. 
  

  

  7. 
  (10) 
  Marginal 
  cell 
  rounded 
  at 
  the 
  apex, 
  which 
  lies 
  below 
  the 
  

  

  margin 
  of 
  the 
  wing. 
  

  

  8. 
  (9) 
  Thorax 
  very 
  hairy, 
  scutellum 
  with 
  two 
  prominent 
  spines 
  

  

  posteriorly, 
  concealed 
  amongst 
  the 
  hair. 
  . 
  . 
  Melecta. 
  

  

  9. 
  (8) 
  Thorax 
  nearly 
  bare 
  except 
  for 
  tomentose 
  markings, 
  the 
  

  

  axillae 
  forming 
  a 
  projecting 
  angle 
  on 
  each 
  side 
  of 
  the 
  

  

  posterior 
  margm 
  of 
  the 
  scutellum. 
  . 
  . 
  . 
  Epeohis. 
  

  

  10. 
  (7) 
  Marginal 
  cell 
  pointed 
  at 
  the 
  apex, 
  ending 
  in 
  an 
  acute 
  angle 
  

  

  on 
  the 
  marginal 
  vein 
  Nomada. 
  

  

  Andrenidae. 
  

  

  1. 
  (10) 
  Two' 
  cubital 
  cells 
  in 
  the 
  front 
  wings. 
  

  

  2. 
  (3) 
  Marginal 
  cell 
  truncate 
  at 
  the 
  apex. 
  . 
  . 
  . 
  Panurgus. 
  

  

  3. 
  (2) 
  Marginal 
  cell 
  pointed 
  at 
  the 
  apex. 
  

  

  4. 
  (9) 
  First 
  cubital 
  cell 
  on 
  the 
  lower 
  side 
  subequal 
  to 
  that 
  of 
  the 
  

  

  2nd 
  in 
  length. 
  (The 
  length 
  is 
  measured 
  as 
  if 
  the 
  lower 
  

   side 
  were 
  straight.) 
  

  

  5. 
  (8) 
  Face 
  not 
  yellow 
  in 
  the 
  c?> 
  hind 
  metatarsus 
  not 
  extra- 
  

  

  ordinarily 
  dilated 
  and 
  clothed. 
  

  

  6. 
  (7) 
  Abdomen 
  without 
  dense 
  appressed 
  hair- 
  bands 
  on 
  the 
  apices 
  

  

  of 
  the 
  segments 
  $ 
  with 
  the 
  calcaria 
  simple. 
  

  

  Dufo7irea. 
  

  

  7. 
  (6) 
  Abdomen 
  with 
  dense 
  hair-bands; 
  calcaria 
  of 
  $ 
  spinosely 
  

  

  serrulate, 
  ajiex 
  of 
  hind 
  metatarsus 
  produced 
  over 
  the 
  

   second 
  tarsal 
  joint 
  in 
  the 
  form 
  of 
  a 
  strong 
  spine. 
  

  

  RliopJiites. 
  

  

  8. 
  (5) 
  (J 
  face 
  largely 
  yellow; 
  $ 
  metatarsus 
  of 
  hind 
  legs 
  excessively 
  

  

  * 
  This 
  character 
  unfortunately 
  cannot 
  be 
  used 
  alone 
  to 
  separate 
  

   the 
  males 
  of 
  our 
  parasitic 
  genera 
  from 
  the 
  non-parasitic, 
  as 
  the 
  c? 
  

   of 
  Melecta 
  luctuosa 
  has 
  the 
  claws 
  formed 
  much 
  like 
  those 
  of 
  Antho- 
  

   phora 
  and 
  different 
  from 
  those 
  of 
  M. 
  arniata. 
  It 
  will, 
  however, 
  

   distinguish 
  the 
  females 
  of 
  the 
  two 
  groups, 
  but 
  the 
  absence 
  of 
  scopae 
  

   is 
  more 
  readily 
  observed. 
  

  

  