﻿The 
  British 
  Species 
  of 
  Andrena 
  and 
  Nomada. 
  269 
  

  

  specific 
  value, 
  when 
  in 
  reality 
  they 
  are 
  far 
  from 
  constant. 
  

   Since 
  the 
  tables 
  were 
  completed, 
  I 
  have 
  myself 
  verified 
  

   them 
  by 
  the 
  examination 
  of 
  individuals 
  of 
  all 
  the 
  species. 
  

   They 
  have 
  also 
  been 
  tried 
  out 
  to 
  some 
  extent 
  by 
  Mr. 
  F. 
  D. 
  

   Morice, 
  and 
  more 
  completely 
  by 
  Mr. 
  H. 
  M. 
  Hallett, 
  such 
  a 
  

   test 
  by 
  others 
  being, 
  I 
  think, 
  of 
  much 
  greater 
  value 
  than 
  

   one 
  made 
  by 
  the 
  writer. 
  

  

  Though 
  neither 
  groups 
  nor 
  species 
  can 
  be 
  altogether 
  

   satisfactorily 
  placed 
  in 
  a 
  linear 
  arrangement, 
  the 
  following 
  

   order 
  is 
  suggested. 
  

  

  Group 
  of 
  A. 
  TIBIALIS. 
  

  

  A. 
  albicans 
  Miill., 
  carbonaria 
  L. 
  (pilipes), 
  bimaculata 
  K., 
  

   tibialis, 
  K. 
  

  

  Group 
  of 
  A. 
  FLAViPES 
  (fulvicrus). 
  

  

  A. 
  flavipes 
  Panz. 
  {fulvicrus), 
  gravida 
  Imh. 
  {fasciata), 
  

   followed 
  by 
  florea 
  F. 
  

  

  Group 
  of 
  A. 
  NIGROAENEA. 
  

  

  A. 
  thoracica 
  F., 
  nitida 
  GeofEr., 
  cineraria 
  L., 
  vaga 
  Panz. 
  

   (ovina 
  Kl.), 
  nigroaenea 
  K., 
  gwynana 
  K., 
  ruficrus 
  NyL. 
  

   angustior 
  K. 
  

  

  Group 
  of 
  A. 
  TRIMMERANA. 
  

  

  A. 
  trimmerana 
  Auct. 
  (nee 
  K.), 
  rosae 
  Panz. 
  var. 
  eximia, 
  

   Sm., 
  rosae 
  Panz., 
  trimmerana 
  K. 
  var. 
  spinigera 
  K., 
  trim- 
  

   merana 
  K. 
  {anglica 
  Alfk.), 
  bucephala 
  St., 
  ferox 
  Sm. 
  

  

  Group 
  of 
  A. 
  VARIANS. 
  

  

  A. 
  fucata 
  Sm., 
  lapponica 
  Zett., 
  varians, 
  synadelpha 
  Perk. 
  

   (ambigua), 
  helvola 
  lj.,fulva 
  Schr., 
  clarkella 
  K., 
  apicata 
  Sm., 
  

   praecox 
  Scop. 
  

  

  Group 
  of 
  A. 
  NIGRICEPS. 
  

  

  A.fuscipes 
  K,, 
  simillima 
  Sm., 
  nigriceps 
  K., 
  tridentata 
  K., 
  

   denticulata 
  K. 
  

  

  Group 
  of 
  A. 
  ARGENT 
  ATA. 
  

  

  A. 
  sericea 
  Chr, 
  (albicrus), 
  argentata 
  Sm. 
  

  

  Group 
  of 
  A. 
  FULVAGO. 
  

  

  A.fulvago 
  Chr., 
  polita 
  Sm. 
  

  

  