﻿THE 
  AXNALS 
  

  

  AND 
  

  

  MAGAZINE 
  OF 
  NATURAL 
  HISTORY. 
  

  

  [EIGHTH 
  SERIES.] 
  

   No. 
  39. 
  MARCH 
  1911. 
  

  

  XXVI. 
  —Descriptions 
  and 
  Records 
  of 
  Bees. 
  — 
  XXXIV. 
  

   By 
  T. 
  D. 
  A. 
  Cockerell, 
  University 
  of 
  Colorado. 
  

  

  LlTHANTHIDIUM, 
  gen. 
  110V. 
  

  

  Related 
  apparently 
  to 
  Anthidium 
  ; 
  robust, 
  thorax 
  above 
  

   very 
  finely 
  and 
  densely 
  punctured, 
  sides 
  of 
  thorax 
  with 
  large 
  

   coarse 
  punctures 
  (this 
  sculpture 
  practically 
  as 
  in 
  Dianthi- 
  

   dium 
  sayi) 
  ; 
  hind 
  tibiae 
  densely 
  hairy. 
  Abdomen 
  probably 
  

   with 
  a 
  ventral 
  scopa, 
  but 
  it 
  is 
  not 
  clearly 
  preserved 
  ; 
  stigma 
  

   large 
  ; 
  marginal 
  cell 
  narrowly 
  rounded 
  at 
  tip, 
  the 
  apex 
  a 
  little 
  

   below 
  costa 
  ; 
  two 
  submarginal 
  cells, 
  the 
  second 
  receiving 
  both 
  

   recurrent 
  nervures, 
  the 
  first 
  some 
  distance 
  from 
  base, 
  the 
  

   second 
  a 
  little 
  before 
  apex 
  ; 
  outer 
  side 
  of 
  second 
  s.m. 
  with 
  a 
  

   single 
  gentle 
  curve 
  ; 
  basal 
  nervure 
  strongly 
  arched 
  at 
  lower 
  

   (basad) 
  end, 
  where 
  it 
  meets 
  the 
  transverso-medial, 
  the 
  latter 
  

   being 
  slightly 
  arched 
  outwards 
  and 
  not 
  noticeably 
  oblique. 
  

   The 
  arching 
  of 
  the 
  base 
  of 
  the 
  basal 
  nervure 
  is 
  also 
  observed 
  

   in 
  the 
  living 
  (Asiatic) 
  P 
  rot 
  anthidium 
  steloides, 
  which 
  differs, 
  

   however, 
  in 
  the 
  shape 
  of 
  the 
  second 
  s.m., 
  and 
  in 
  having 
  the 
  

   second 
  r. 
  n. 
  going 
  beyond 
  apex 
  of 
  second 
  s.m. 
  There 
  is 
  

   some 
  resemblance 
  to 
  the 
  fossil 
  Pelandrena 
  reducta, 
  but 
  in 
  

   Pelandrena 
  the 
  second 
  s.m. 
  is 
  contracted 
  apically 
  and 
  the 
  

   t.-m. 
  is 
  oblique. 
  

  

  Lithanthidium 
  pertriste, 
  sp. 
  n. 
  

  

  Black, 
  very 
  robust. 
  Head 
  and 
  thorax 
  about 
  4 
  mm. 
  long, 
  

   abdomen 
  about 
  4|, 
  doubtless 
  5 
  when 
  extended 
  ; 
  anterior 
  

   Ann, 
  & 
  Mag. 
  N. 
  Hist. 
  Ser. 
  8. 
  Vol. 
  vii. 
  15 
  

  

  