﻿438 
  Mr. 
  Charles 
  J. 
  Gahan 
  on 
  the 
  

  

  65. 
  Diahrotica 
  humeralis, 
  Gahan, 
  sp. 
  n. 
  

  

  Fulvo-testacea 
  ; 
  capite 
  metasternoque 
  nigris, 
  antennis 
  medio 
  

   apiceque 
  infascatis 
  ; 
  prothoracis 
  dorso 
  impunctato, 
  nitido, 
  obsolete 
  

   tri-impresso 
  ; 
  elytris 
  dense 
  distincteque 
  punctatis, 
  utrisque 
  vittis 
  

   brevibiis 
  duabus 
  (iina 
  marginali, 
  altera 
  dorsali) 
  antice 
  ad 
  humerum 
  

   conjunctis, 
  et 
  maculis 
  duabus, 
  pone 
  medium 
  obliquiter 
  positis, 
  

   nigro-cyaneis. 
  Long. 
  6| 
  mm. 
  

  

  Hab. 
  Peru. 
  

  

  Head 
  black. 
  Prothorax 
  testaceous, 
  nitid, 
  almost 
  impunctate, 
  

   and 
  with 
  three 
  very 
  faint 
  and 
  almost 
  obsolete 
  impressions 
  on 
  the 
  

   disk 
  ; 
  sides 
  straight 
  and 
  nearly 
  parallel 
  from 
  the 
  base 
  to 
  the 
  

   anterior 
  third, 
  thence 
  converging 
  anteriorlj^ 
  Elytra 
  dilated 
  pos- 
  

   teriorly, 
  thickly 
  and 
  rather 
  strongly 
  punctured 
  ; 
  each 
  with 
  two 
  

   short 
  vittae, 
  one 
  along 
  the 
  margin 
  below 
  the 
  shoulder, 
  the 
  other 
  on 
  

   the 
  disk 
  above 
  the 
  shoulder, 
  which 
  are 
  united 
  in 
  front, 
  and 
  with 
  

   two 
  spots, 
  obliquely 
  placed 
  between 
  the 
  middle 
  and 
  the 
  apes, 
  

   dark 
  blue. 
  

  

  66. 
  Diahrotica 
  bistrigata 
  (Reiclie 
  MS.), 
  sp. 
  n. 
  

  

  Ovata, 
  postice 
  paullo 
  dilatata 
  ; 
  capite 
  nigro 
  ; 
  antennis 
  medio 
  

   fuscis, 
  basi 
  apiceque 
  falvis 
  ; 
  prothorace 
  testaceo, 
  disco 
  convexo 
  

   levi 
  vix 
  punctato 
  ; 
  elytris 
  dense 
  punctulatis, 
  flavis, 
  sutm'a 
  breviter 
  

   pone 
  scutellum 
  et 
  vitta 
  utrinque 
  ab 
  humero 
  descendente 
  et 
  postice 
  

   abbreviata 
  nigro-fuscis 
  ; 
  corpore 
  subtus 
  (pectore 
  nigro 
  excepto) 
  

   pedibusque 
  flavis. 
  

  

  Long. 
  5 
  — 
  6 
  mm. 
  

  

  Hab. 
  Brazil 
  : 
  Petropolis, 
  Constancia, 
  Tejuca 
  {H. 
  

   Clai'k 
  and 
  J. 
  Gray). 
  

  

  Head 
  black 
  ; 
  antennae 
  dark 
  brown, 
  with 
  the 
  two 
  or 
  thi'ee 
  last 
  

   and 
  usually 
  also 
  the 
  first 
  two 
  or 
  three 
  joints 
  fulvous. 
  Prothorax 
  

   testaceous, 
  the 
  disk 
  smooth, 
  convex, 
  and 
  almost 
  impunctate. 
  

   Elytra 
  thickly 
  and 
  finely 
  punctured, 
  yellow, 
  with 
  the 
  suture 
  for 
  a 
  

   short 
  distance 
  behind 
  the 
  scutellum 
  and 
  a 
  vitta 
  on 
  each 
  side 
  fi-om 
  

   the 
  shoulder 
  extending 
  to 
  about 
  the 
  beginning 
  of 
  the 
  apical 
  third, 
  

   and 
  often 
  interrupted 
  a 
  little 
  before 
  its 
  extremity, 
  brownish 
  black. 
  

  

  This 
  species 
  resembles 
  some 
  in 
  the 
  first 
  section, 
  but 
  is 
  

   easily 
  to 
  be 
  distinguished 
  by 
  the 
  relative 
  length 
  of 
  the 
  

   third 
  antennal 
  joint. 
  This 
  joint 
  is 
  more 
  than 
  tAvice 
  as 
  

   long 
  as 
  the 
  second, 
  and 
  is 
  quite 
  equal 
  in 
  length 
  to 
  the 
  

   fourth. 
  

  

  