﻿REVISION 
  OF 
  TRIBE 
  CERESINI 
  — 
  CALDWELL 
  517 
  

  

  August 
  3, 
  1902, 
  on 
  oak 
  (Pierce); 
  and 
  one 
  female 
  para 
  type, 
  Cams, 
  

   Nebr., 
  July 
  24, 
  1902, 
  on 
  Ambrosia 
  (Pierce). 
  

  

  STICTOLOBUS 
  BOREALIS 
  ARCUATUS. 
  new 
  subspecies 
  

  

  Plate 
  23 
  

  

  Thorax 
  much 
  higher 
  and 
  more 
  arched 
  than 
  in 
  typical 
  borealis. 
  

   Teeth 
  on 
  lateral 
  valves 
  very 
  suddenly 
  narrowed 
  in 
  apical 
  three-fifths 
  

   and 
  curved 
  dorsally. 
  Sternal 
  plate 
  shallow 
  apically. 
  

  

  Male 
  holotype 
  (U.S.N. 
  M. 
  No. 
  57653) 
  and 
  paratype, 
  Beeville, 
  Tex., 
  

   May 
  30, 
  1910 
  (Pierce). 
  

  

  The 
  forms 
  occurring 
  within 
  the 
  United 
  States 
  are 
  listed: 
  

  

  borealis, 
  new 
  species 
  

  

  arcuatus, 
  new 
  subspecies 
  

   minor 
  (Fowler, 
  1895), 
  new 
  combination 
  [Ceresa] 
  

   subulatus 
  (Say, 
  1831) 
  

  

  rmnutus 
  (Funkhouser, 
  1915), 
  new 
  synonymy 
  [Stictocephala] 
  

  

  VESTISTILUS, 
  new 
  genus 
  

  

  Plate 
  19, 
  Figure 
  10 
  

  

  Intermediate 
  between 
  Stictolobus 
  Aletcalf 
  and 
  Spissistilus, 
  new 
  

   genus, 
  in 
  genital 
  characters 
  but 
  differing 
  from 
  these 
  genera 
  by 
  the 
  

   over-all 
  large 
  size 
  and 
  by 
  the 
  short 
  sternal 
  plate 
  which 
  is 
  greatly 
  

   compressed 
  laterally. 
  

  

  Pronotum 
  highly 
  arched; 
  suprahumerals 
  usually 
  developed 
  into 
  

   long, 
  stout 
  horns 
  but 
  sometimes 
  reduced 
  to 
  prominent 
  protuberances; 
  

   metopidium 
  very 
  broad. 
  Lateral 
  valves 
  with 
  teeth 
  arising 
  on 
  ventral 
  

   margins 
  longer 
  than 
  length 
  of 
  valves 
  ; 
  teeth 
  flattened 
  basally. 
  Sternal 
  

   plate 
  compressed 
  laterally, 
  projecting 
  ventrally. 
  Styles 
  vestigial 
  or 
  

   greatly 
  reduced 
  in 
  apical 
  half. 
  Aedeagus 
  with 
  arms 
  almost 
  at 
  right 
  

   angle 
  to 
  each 
  other; 
  posterior 
  arm 
  much 
  more 
  elongate 
  than 
  anterior 
  

   with 
  the 
  apex 
  recurved 
  or 
  hooked 
  anteriorly; 
  sometimes 
  with 
  a 
  pair 
  

   of 
  small 
  basal 
  spines; 
  functional 
  orifice 
  subapical, 
  small, 
  ovate. 
  

  

  Type 
  of 
  the 
  genus, 
  Ceresa 
  ancora 
  Ball 
  (1937, 
  p. 
  479), 
  a 
  species 
  from 
  

   southern 
  Arizona. 
  As 
  far 
  as 
  known 
  this 
  genus 
  is 
  limited 
  primarily 
  to 
  

   Mexico 
  and 
  Central 
  America. 
  Ceresa 
  curvicornis 
  Funkhouser 
  (1942, 
  

   p. 
  181), 
  described 
  from 
  a 
  single 
  female 
  specimen 
  from 
  Arizona, 
  is 
  

   included 
  because 
  of 
  its 
  large 
  size, 
  broad 
  metopidium, 
  and 
  strongly 
  

   developed 
  horns 
  which 
  are 
  strongly 
  suggestive 
  of 
  ancora 
  Ball. 
  A 
  study 
  

   of 
  Biologia 
  Centrali-Americana 
  material 
  in 
  the 
  collection 
  of 
  the 
  

   U. 
  S. 
  National 
  Museum 
  indicates 
  that 
  nigrovittatus 
  (Fowler) 
  and 
  

   variabilis 
  (Fowler) 
  belong 
  in 
  this 
  genus. 
  V. 
  vacca 
  (Fowler) 
  is 
  the 
  

   common 
  species 
  in 
  Mexico, 
  according 
  to 
  Plummer 
  (1935, 
  p. 
  374), 
  on 
  

   authority 
  of 
  determinations 
  by 
  Funkhouser, 
  but 
  the 
  most 
  abundant 
  

   form 
  in 
  the 
  U. 
  S. 
  National 
  Museum 
  collection 
  has 
  been 
  determined 
  

   as 
  testaceus 
  (Fairmaire). 
  This 
  includes 
  specimens 
  from 
  the 
  Biologia 
  

  

  