﻿338 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  PENTONISCUS 
  PRUINOSUS, 
  new 
  species. 
  

  

  Body 
  oblong-ovate, 
  4 
  mm. 
  long 
  and 
  1 
  h 
  mm. 
  wide. 
  Color 
  reddish- 
  

   brown 
  with 
  wavy 
  lines 
  of 
  yellow 
  on 
  either 
  side 
  of 
  the 
  median 
  line. 
  

  

  Head 
  wider 
  than 
  long, 
  with 
  the 
  front 
  not 
  margined. 
  Antero- 
  

   lateral 
  lobes 
  small; 
  front 
  slightly 
  produced 
  in 
  the 
  middle 
  in 
  a 
  widely 
  

   rounded 
  lobe. 
  Eyes 
  very 
  small, 
  black, 
  and 
  situated 
  about 
  the 
  

   middle 
  of 
  the 
  lateral 
  margin. 
  The 
  second 
  antennae 
  have 
  the 
  first 
  

   article 
  short, 
  the 
  second 
  and 
  third 
  subequal, 
  and 
  each 
  a 
  little 
  longer 
  

   than 
  the 
  first; 
  the 
  fourth 
  is 
  one 
  and 
  a 
  half 
  times 
  

   longer 
  than 
  the 
  third; 
  the 
  fifth 
  is 
  a 
  little 
  longer 
  

   than 
  the 
  fourth. 
  The 
  flagellum 
  consists 
  of 
  five 
  

   articles, 
  the 
  third 
  and 
  fourth 
  being 
  rather 
  indis- 
  

   tinctly 
  separated, 
  and 
  a 
  long 
  terminal 
  spine 
  equal 
  

   in 
  length 
  to 
  the 
  flagellum. 
  

  

  The 
  first 
  segment 
  of 
  the 
  thorax 
  is 
  a 
  little 
  longer 
  

   than 
  any 
  of 
  the 
  

   following 
  seg- 
  

   ments, 
  which 
  are 
  

   subequal. 
  The 
  

   post 
  - 
  lateral 
  an- 
  

   gles 
  of 
  the 
  last 
  

   three 
  segments 
  

   are 
  produced 
  

   backward; 
  those 
  

   of 
  the 
  first 
  four 
  segments 
  are 
  rounded. 
  

  

  The 
  abdomen 
  is 
  abruptly 
  narrower 
  than 
  the 
  thorax. 
  The 
  lateral 
  

   parts 
  of 
  the 
  first 
  two 
  segments 
  are 
  concealed 
  by 
  the 
  seventh 
  thoracic 
  

  

  Fig. 
  1.— 
  Pentoniscus 
  

   pruinosus. 
  

  

  Fig. 
  2.— 
  Pentoniscus 
  pruinosus. 
  

  

  ANTENNA. 
  

  

  Fig. 
  3.— 
  Penton- 
  

   iscus 
  PRinNO- 
  

   sus. 
  Maxilu- 
  

  

  PED. 
  

  

  Fig. 
  4.— 
  Penton- 
  

   iscus 
  PRUINO- 
  

   SUS. 
  Inner 
  la- 
  

   mella 
  OF 
  sec- 
  

   ond 
  MAXILLA. 
  

  

  Fig. 
  5.— 
  Penton- 
  

   iscus 
  PRUINO- 
  

   SUS. 
  Mandi- 
  

   ble. 
  

  

  segment. 
  The 
  post-lateral 
  angles 
  of 
  the 
  three 
  following 
  segments 
  are 
  

   produced 
  backward 
  in 
  very 
  acute 
  angles. 
  The 
  first 
  segment 
  is 
  a 
  lit- 
  

   tle 
  shorter 
  than 
  any 
  of 
  the 
  others, 
  which 
  are 
  subequal. 
  The 
  sixth 
  or 
  

   terminal 
  segment 
  is 
  triangular, 
  with 
  the 
  apex 
  rounded. 
  The 
  pedun- 
  

   cle 
  of 
  the 
  uropoda 
  extends 
  almost 
  to 
  the 
  extremity 
  of 
  the 
  terminal 
  

  

  