﻿NO. 
  1124. 
  EEFISION 
  OF 
  THE 
  MELA 
  NOPLI—SC 
  UDDER. 
  399 
  

  

  wanting; 
  metazona 
  less 
  than 
  half 
  as 
  loug 
  as 
  the 
  prozona, 
  the 
  latter 
  

   divided 
  a 
  little 
  behind 
  the 
  middle 
  by 
  a 
  scarcely 
  perceptible 
  sinuate 
  

   sulcus; 
  lateral 
  lobes 
  nearly 
  twice 
  as 
  loug 
  as 
  broad, 
  narrowing 
  down- 
  

   ward, 
  the 
  inferior 
  margin 
  very 
  broadly 
  augulate, 
  tUe 
  x>osterior 
  margin 
  

   roundly 
  excised. 
  Prosterual 
  spine 
  blunt, 
  conico-cylindrical 
  ; 
  inner 
  mar- 
  

   gin 
  of 
  mesosternal 
  lobes 
  broadly 
  convex, 
  the 
  lobes 
  subapproximate 
  

   (male) 
  or 
  distant 
  from 
  each 
  other 
  by 
  half 
  their 
  width 
  (female); 
  meta- 
  

   sternal 
  lobes 
  subcontiguous 
  in 
  both 
  sexes. 
  Teginina 
  linear, 
  about 
  as 
  

   long 
  as 
  the 
  pronotum, 
  or 
  absent. 
  Hind 
  femora 
  extending 
  nearly 
  to 
  

   (female) 
  or 
  a 
  little 
  beyond 
  (male) 
  the 
  tip 
  of 
  tbe 
  abdomen, 
  the 
  superior 
  

   margin 
  unarmed, 
  the 
  hind 
  tibiae 
  with 
  their 
  outer 
  edges 
  smooth, 
  the 
  

   spines 
  similar 
  in 
  length 
  on 
  the 
  two 
  sides, 
  tbose 
  of 
  the 
  outer 
  series 
  nine 
  

   to 
  ten 
  in 
  number 
  ; 
  first 
  and 
  third 
  tarsal 
  joints 
  equal, 
  the 
  second 
  less 
  than 
  

   half 
  as 
  loug 
  as 
  either. 
  Abdomen 
  indistinctly 
  carinate 
  throughout, 
  the 
  

   extremity 
  scarcely 
  enlarged 
  in 
  the 
  male; 
  subgenital 
  plate 
  ampliate 
  at 
  

   base, 
  short, 
  not 
  projecting 
  far 
  beyond 
  the 
  tip 
  of 
  the 
  small 
  supraanal 
  

   plate, 
  and 
  in 
  particular 
  so 
  little 
  elevated 
  posteriorly 
  as 
  to 
  expose 
  the 
  

   recumbent 
  pallium 
  more 
  or 
  less 
  to 
  a 
  posterior 
  view; 
  furcula 
  feeble; 
  

   cerci 
  styliform; 
  iiifracercal 
  plates 
  highly 
  developed. 
  

  

  In 
  general 
  appearance 
  tbe 
  species 
  of 
  this 
  genus 
  most 
  nearly 
  resemble 
  

   those 
  of 
  Gymnoscirfctcs 
  Bruner, 
  Paradichrophis 
  Brunner, 
  and 
  Scopas 
  

   Giglio 
  Tos. 
  The 
  distinctions 
  of 
  the 
  genus 
  from 
  the 
  first, 
  besides 
  its 
  

   ampliate 
  subgenital 
  plate, 
  are 
  pointed 
  out 
  under 
  that 
  genus. 
  From 
  

   Paradichroplus 
  it 
  differs 
  in 
  its 
  more 
  compressed 
  body, 
  the 
  more 
  taper- 
  

   ing 
  vertex, 
  the 
  slenderer 
  tegmina 
  (when 
  they 
  are 
  present), 
  the 
  lack 
  of 
  

   any 
  enlargement 
  of 
  the 
  tip 
  of 
  the 
  male 
  abdomen, 
  with 
  the 
  shorter 
  sub- 
  

   genital 
  plate, 
  the 
  ampliate 
  basal 
  margin 
  of 
  the 
  same, 
  the 
  posteriorly 
  

   exposed 
  pallium, 
  and 
  the 
  wholly 
  simple 
  cerci. 
  From 
  Scopas, 
  which 
  I 
  

   have 
  not 
  seen, 
  it 
  appears 
  to 
  differ 
  in 
  its 
  more 
  prominent 
  prosterual 
  

   spine, 
  its 
  narrower 
  labrum, 
  more 
  declivent 
  face, 
  less 
  cylindrical 
  pro- 
  

   notum, 
  with 
  its 
  excised 
  posterior 
  margin, 
  besides 
  its 
  simple 
  cerci. 
  Its 
  

   subconical 
  head, 
  especially 
  in 
  the 
  female, 
  gives 
  it 
  a 
  peculiar 
  aspect. 
  

  

  A. 
  sphenarioides 
  Scudder, 
  is 
  the 
  type. 
  

  

  Three 
  species 
  occur 
  in 
  the 
  Southern 
  States 
  along 
  the 
  borders 
  of 
  the 
  

   Gulf 
  of 
  Mexico, 
  and 
  may 
  be 
  separated 
  as 
  follows: 
  

  

  ANALYTICAL 
  KEY 
  TO 
  THE 
  SPECIES 
  OF 
  APTENOPEDES. 
  

  

  A'. 
  Tegmiua 
  present 
  in 
  one 
  or 
  both 
  sexes; 
  frontal 
  costa 
  no 
  broader 
  at 
  base 
  than 
  in 
  

   the 
  middle. 
  

  

  fc'. 
  Tegmiua 
  present 
  in 
  both 
  sexes; 
  furcula 
  of 
  male 
  as 
  long 
  as 
  the 
  last 
  dorsal 
  seg- 
  

   ment; 
  anal 
  cerci 
  tapering 
  only 
  on 
  basal 
  half 
  1. 
  sjyhenarioides 
  (p. 
  400). 
  

  

  1)-. 
  Tegmina 
  present 
  in 
  female 
  only; 
  furcula 
  of 
  male 
  not 
  more 
  than 
  half 
  as 
  long 
  

   as 
  the 
  last 
  dorsal 
  segment; 
  anal 
  cerci 
  tapering 
  almost 
  unifnnnly 
  through- 
  

   out 
  2. 
  rufovittaia 
  (p. 
  401). 
  

  

  A^ 
  Tegmiua 
  present 
  iu 
  neither 
  sex; 
  frontal 
  costa 
  much 
  broader 
  at 
  base 
  than 
  iu 
  

   middle, 
  at 
  least 
  in 
  the 
  male 
  3. 
  aptera 
  (p. 
  402). 
  

  

  