﻿12 
  Rev. 
  T. 
  A. 
  Marshall's 
  Monnrjraph 
  of 
  

  

  abdomen 
  longer, 
  more 
  depressed, 
  the 
  posterior 
  segments 
  more 
  

   broadly 
  visible, 
  and 
  the 
  claws 
  shorter. 
  

  

  1. 
  Ademon 
  decrescens, 
  Nees. 
  (PI. 
  II., 
  fig. 
  1, 
  ? 
  )• 
  

  

  Rogas 
  decrescens, 
  Nees, 
  Mon., 
  i., 
  220; 
  A. 
  decrescens, 
  

   Hal., 
  Ent. 
  Mag., 
  iv., 
  104 
  ; 
  Ojmis 
  decrescens, 
  

   Wesm., 
  Nouv. 
  Mem. 
  Ac. 
  Brux., 
  1838, 
  p. 
  148, 
  

   3 
  ? 
  . 
  

   Eesembles 
  a 
  small 
  Bhogas. 
  Variable 
  ; 
  nsnally 
  black 
  ; 
  mandibles, 
  

   palpi, 
  and 
  legs 
  rafo-piceons. 
  Antennae 
  shorter 
  than 
  the 
  bodj', 
  

   21 
  — 
  27-jointed 
  ; 
  basal 
  joints 
  of 
  the 
  flagelkmi 
  elongate, 
  the 
  others 
  

   rapidly 
  decreasing 
  in 
  length 
  to 
  the 
  apex 
  ; 
  last 
  joint 
  not 
  longer 
  than 
  

   the 
  penultimate 
  ; 
  3d 
  joint 
  equal 
  to 
  the 
  4 
  apical 
  joints 
  taken 
  

   together. 
  Scutellum 
  preceded 
  by 
  a 
  cancellated 
  fovea. 
  "Wings 
  

   variable 
  (see 
  infra) 
  ; 
  radix 
  and 
  squamula 
  rufoiis, 
  with 
  a 
  dark 
  spot. 
  

   Abdomen 
  $ 
  oblong-ovate, 
  subconvex 
  ; 
  segments 
  1, 
  2 
  equal 
  in 
  

   length, 
  Avidened 
  behind, 
  densely 
  punctulate 
  or 
  scabrous 
  ; 
  sutm-i- 
  

   form 
  articulation 
  curved, 
  deeply 
  impressed 
  ; 
  3d 
  segment 
  punctu- 
  

   late, 
  with 
  the 
  hinder 
  margin 
  smooth, 
  forming 
  a 
  transverse 
  carina 
  ; 
  

   apical 
  segments 
  also 
  smooth, 
  or 
  only 
  the 
  base 
  of 
  the 
  4th 
  punctu- 
  

   late 
  ; 
  posterior 
  margin 
  of 
  all 
  the 
  segments 
  ciliated. 
  S' 
  ? 
  • 
  Length, 
  

   1 
  — 
  1^ 
  ; 
  wings, 
  2^ 
  — 
  3^ 
  lines. 
  

  

  Haliday 
  arranges 
  the 
  principal 
  varieties 
  in 
  two 
  

   sections 
  : 
  — 
  

  

  I. 
  Wings 
  infumated 
  ; 
  stigma 
  and 
  nervures 
  fuscous 
  ; 
  body 
  black, 
  

   abdomen 
  sometimes 
  pieeous 
  behind. 
  ^ 
  $ 
  . 
  

   Var. 
  1. 
  Legs 
  blackish, 
  trochanters 
  pale 
  broA^-n 
  or 
  yellow, 
  base 
  

   of 
  tibiae 
  and 
  tarsi 
  sometimes 
  pale. 
  

  

  Var. 
  2. 
  Coxae, 
  femora, 
  and 
  base 
  of 
  tibiae 
  dull 
  nifous 
  ; 
  or 
  legs 
  

   rufous, 
  with 
  the 
  tibiae 
  and 
  tips 
  of 
  the 
  tarsi 
  dark. 
  

  

  Var. 
  3. 
  Sides 
  of 
  prothorax 
  rufous 
  ; 
  the 
  rest 
  as 
  in 
  Var. 
  1. 
  

  

  II. 
  Wmgs 
  yellowish, 
  clouded 
  with 
  fiiscous 
  at 
  the 
  base 
  and 
  apex 
  ; 
  

   stigma 
  yellow 
  ; 
  nerAiires 
  becoming 
  paler 
  towards 
  the 
  ex- 
  

   tremity. 
  Females 
  only. 
  

  

  Var. 
  4. 
  Black 
  ; 
  prothorax 
  rufous 
  ; 
  posterior 
  margin 
  of 
  segments 
  

   3 
  — 
  4, 
  and 
  following 
  segments 
  entirely, 
  pieeous. 
  Legs 
  blackish, 
  

   with 
  yellow 
  trochanters 
  ; 
  base 
  of 
  the 
  tibiae 
  and 
  almost 
  the 
  whole 
  of 
  

   the 
  tarsi, 
  ferruginous. 
  

  

  Var. 
  5. 
  Black 
  ; 
  thorax 
  in 
  front, 
  and 
  abdomen 
  after 
  the 
  3d 
  seg. 
  

   ment, 
  rufous. 
  Femora 
  blackish 
  brown 
  ; 
  tibiae 
  brown 
  ; 
  coxae 
  and 
  

   greater 
  part 
  of 
  the 
  tarsi 
  ferruginous 
  ; 
  apex 
  of 
  femora 
  and 
  base 
  of 
  

  

  