﻿516 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  anterior 
  arm. 
  This 
  genus 
  includes 
  the 
  small, 
  slender 
  species 
  with 
  the 
  

   suprahumerals 
  usually 
  developed 
  into 
  horns; 
  however, 
  the 
  type 
  

   species 
  has 
  the 
  suprahumerals 
  unarmed. 
  

  

  Metopidium 
  almost 
  vertical. 
  Teeth 
  of 
  lateral 
  valves 
  longer 
  than 
  

   length 
  of 
  valves, 
  usually 
  curved 
  dorsally 
  or 
  convergent 
  apically. 
  

   Sternal 
  plate 
  short, 
  lacking 
  notch 
  on 
  ventral 
  margin 
  apically. 
  Styles 
  

   greatly 
  reduced 
  in 
  size 
  in 
  apical 
  half. 
  Aedeagus 
  with 
  anterior 
  arm 
  

   vestigial 
  or 
  not 
  apparent 
  ; 
  posterior 
  arm 
  with 
  anteriorly 
  directed 
  apical 
  

   hook; 
  functional 
  orifice 
  elongate, 
  extending 
  from 
  apex 
  of 
  aedeagus 
  

   half 
  the 
  distance 
  to 
  the 
  base. 
  

  

  Type 
  of 
  the 
  genus, 
  Membracis 
  suhulata 
  Say 
  (1831, 
  p. 
  378), 
  a 
  species 
  

   from 
  the 
  United 
  States. 
  Ceresa 
  vitulus 
  minor 
  Fowler, 
  actually 
  a 
  valid 
  

   species, 
  as 
  stated 
  by 
  Buckton 
  (1903, 
  p. 
  171), 
  occurs 
  in 
  southern 
  Texas, 
  

   and 
  it 
  is 
  probable 
  that 
  varieties 
  and 
  subspecies 
  of 
  it 
  occur 
  southward 
  

   into 
  British 
  Guiana. 
  The 
  interpretation 
  of 
  minor 
  is 
  based 
  on 
  Biologia 
  

   Centrali-Americana 
  material 
  in 
  the 
  U. 
  S. 
  National 
  Museum 
  from 
  

   Teapa, 
  Tabasco; 
  a 
  species 
  and 
  a 
  subspecies, 
  previously 
  confused 
  with 
  

   minor, 
  are 
  described 
  as 
  new 
  from 
  the 
  United 
  States. 
  According 
  to 
  

   determined 
  material 
  in 
  the 
  Ball 
  collection, 
  minutus 
  (Funkhouser) 
  is 
  a 
  

   synonym 
  of 
  suhulatus 
  (Say) 
  . 
  

  

  STICTOLOBUS 
  BOREALIS, 
  new 
  species 
  

  

  Plate 
  23 
  

  

  Resembling 
  minor 
  (Fowler) 
  but 
  with 
  much 
  flatter 
  metopidium 
  and 
  

   much 
  shorter 
  and 
  stouter 
  horns. 
  

  

  Length, 
  male 
  6.8 
  mm., 
  female 
  7.5 
  mm. 
  General 
  color 
  amber 
  mottled 
  

   with 
  white 
  spots. 
  Apices 
  of 
  horns 
  and 
  posterior 
  process 
  black. 
  Two 
  

   white 
  lines 
  originating 
  on 
  posterior 
  side 
  of 
  each 
  horn 
  and 
  extending 
  

   caudad; 
  ventral 
  line 
  following 
  ventral 
  margin 
  of 
  pronotum; 
  dorsal 
  

   line 
  arched, 
  following 
  the 
  contour 
  of 
  dorsal 
  crest 
  but 
  located 
  ventrally 
  

   to 
  crest; 
  the 
  two 
  lines 
  converging 
  and 
  ending 
  on 
  ventral 
  margin 
  of 
  

   pronotum 
  anterior 
  to 
  posterior 
  process. 
  Elytra 
  yellowish 
  apically. 
  

  

  Thorax 
  low, 
  little 
  arched 
  ; 
  metopidium 
  vertical 
  below 
  suprahumerals 
  

   thence 
  abruptly 
  bent 
  posteriorly 
  above 
  suprahumerals; 
  humerals 
  

   prominent; 
  suprahumeral 
  horns 
  thick, 
  obtuse, 
  slightly 
  recm-ved; 
  

   posterior 
  process 
  long, 
  declivent. 
  

  

  Teeth 
  of 
  lateral 
  valves 
  thickened 
  in 
  basal 
  two-thirds; 
  apical 
  third 
  

   stylate, 
  abruptly 
  curved 
  dorsally. 
  Sternal 
  plate 
  very 
  deep 
  apically; 
  

   apex 
  split. 
  Apices 
  of 
  styles 
  greatly 
  reduced 
  in 
  size, 
  paddle-shaped. 
  

   Last 
  ventral 
  segment 
  of 
  female 
  with 
  posterior 
  margin 
  very 
  broadly, 
  

   deeply 
  notched; 
  sides 
  of 
  notch 
  slightly 
  sinuate. 
  

  

  Male 
  holotype 
  (U.S.N.M. 
  No. 
  57652), 
  two 
  male 
  paratypes, 
  and 
  

   one 
  female 
  paratype 
  from 
  Niobrara, 
  Nebr., 
  July 
  13, 
  1902 
  (Pierce); 
  

   female 
  allotype, 
  two 
  female 
  paratypes, 
  and 
  male 
  paratype 
  from 
  West 
  

   Point, 
  Nebr., 
  "8-87"; 
  two 
  male 
  paratypes 
  from 
  Rock 
  County, 
  Nebr., 
  

  

  