﻿The 
  British 
  Species 
  of 
  Andrena 
  and 
  Nomada. 
  289 
  

  

  86. 
  (84) 
  Fifth 
  antennal 
  joint 
  more 
  nearly 
  square, 
  not 
  appearing 
  

   transverse, 
  in 
  outline, 
  differing 
  notably 
  from 
  the 
  4th. 
  

  

  86. 
  (87) 
  Mesonotum 
  very 
  dull, 
  the 
  punctures 
  remote 
  and 
  very 
  fine, 
  

  

  sometimes 
  wanting, 
  or 
  hardly 
  visible 
  amid 
  the 
  surface 
  

   sculpture 
  ; 
  scutellum 
  never 
  polished, 
  at 
  most 
  rather 
  less 
  

   dull 
  than 
  the 
  mesonotum 
  subopaca. 
  

  

  87. 
  (86) 
  Mesonotum 
  generally 
  either 
  very 
  conspicuously 
  or 
  more 
  or 
  

  

  less 
  closely 
  punctured, 
  sometimes 
  more 
  or 
  less 
  shining, 
  

   the 
  scutellum 
  often, 
  in 
  part 
  at 
  least, 
  with 
  polished 
  surface. 
  

  

  88. 
  (89) 
  Mesonotum 
  normally 
  closely 
  and 
  evenly 
  punctured, 
  the 
  

  

  face 
  beneath 
  the 
  antennae 
  in 
  fresh 
  examples 
  with 
  

   yellowish 
  or 
  yellowish- 
  brown 
  hairs. 
  . 
  . 
  . 
  minutula. 
  

  

  89. 
  (90) 
  Mesonotum 
  normally 
  more 
  irregularly 
  punctured, 
  often 
  

  

  more 
  or 
  less 
  highly 
  polished, 
  the 
  scutellum 
  usually 
  with 
  

   some 
  part 
  at 
  least 
  polished; 
  hairs 
  of 
  the 
  face 
  white. 
  

  

  minutuloides. 
  

  

  90. 
  (67) 
  Species 
  generally 
  at 
  least 
  medium-sized, 
  those 
  comparable 
  

  

  in 
  size 
  and 
  appearance 
  with 
  the 
  minutula 
  group 
  have 
  

   the 
  mandibles 
  forming 
  a 
  distinct 
  cross 
  at 
  the 
  tips 
  in 
  

   apical 
  view. 
  

   (Many 
  but 
  not 
  all 
  species 
  have 
  the 
  4th 
  antennal 
  joint 
  

   longer 
  than 
  wide.) 
  

  

  91. 
  (92) 
  Hind 
  tibiae 
  and 
  metatarsi 
  translucent 
  yellow, 
  the 
  former 
  

  

  at 
  most 
  partly 
  subinfuscate 
  ; 
  basal 
  abdominal 
  segment 
  

  

  poUshed 
  and 
  clearly 
  punctured 
  fulvago. 
  

  

  (Flagellar 
  joints 
  of 
  antennae 
  shining 
  beneath 
  and 
  in 
  some 
  

   aspects 
  with 
  narrow 
  basal 
  pubescent 
  bands; 
  mandibles 
  

   short, 
  not 
  crossing 
  at 
  the 
  tips; 
  ventral 
  abdominal 
  

   segments 
  with 
  long 
  specialised 
  ciliations.) 
  

  

  92. 
  (91) 
  Hind 
  tibiae 
  usually 
  dark 
  or 
  pale 
  only 
  at 
  the 
  apex; 
  if 
  as 
  

  

  above 
  the 
  basal 
  abdominal 
  segment 
  is 
  not 
  polished. 
  

  

  93. 
  (94) 
  Normally 
  a 
  large 
  species, 
  with 
  white-haired 
  clypeus, 
  the 
  

  

  abdomen 
  poUshed 
  and 
  clearly 
  and 
  copiously 
  punctured 
  

   all 
  over, 
  the 
  apical 
  impressions 
  conspicuously 
  pale 
  and 
  

  

  without 
  dense 
  white 
  hair- 
  bands 
  polita. 
  

  

  (Antennae 
  with 
  the 
  flagellum 
  more 
  or 
  less 
  shining 
  beneath, 
  

   the 
  3rd 
  joint 
  strongly 
  elongated, 
  about 
  twice 
  as 
  long 
  

   as 
  its 
  apical 
  width; 
  mandibles 
  not 
  forming 
  a 
  cross 
  at 
  

   the 
  tips 
  ; 
  ventral 
  segments 
  with 
  long 
  specialised 
  ciliation.) 
  

  

  94. 
  (93) 
  Those 
  of 
  the 
  following 
  species 
  that 
  are 
  large 
  and 
  have 
  a 
  

  

  white-haired 
  clypeus, 
  have 
  not 
  all 
  the 
  abdominal 
  

   characters 
  of 
  polita, 
  as 
  given 
  above. 
  

  

  95. 
  (96) 
  Sides 
  of 
  head 
  behind 
  the 
  eyes 
  with 
  the 
  hind 
  margin 
  

  

  conspicuously 
  raised 
  or 
  thickened. 
  . 
  . 
  nitidiuscula. 
  

   TRANS. 
  ENT, 
  SOC. 
  LOND. 
  1919. 
  — 
  PARTS 
  I, 
  II. 
  (jULY) 
  U 
  

  

  