﻿DESCRIPTIONS 
  OF 
  WOOD-BORING 
  LARV^. 
  259 
  

  

  Body 
  contracted 
  on 
  the 
  Gth 
  abdominal 
  segment, 
  which 
  is 
  consider- 
  

   ably 
  narrower 
  than 
  the 
  succeeding 
  part 
  of 
  the 
  abdomen, 
  the 
  7th 
  

   abdominal 
  segment 
  being 
  wider 
  than 
  the 
  6th, 
  and 
  of 
  the 
  same 
  width 
  

   as 
  the 
  8th 
  5 
  the 
  9th 
  much 
  shorter 
  and 
  two-thirds 
  as 
  wide 
  as 
  the 
  8th. 
  

   The 
  10th 
  segment 
  small, 
  one-half 
  as 
  wide 
  but 
  nearly 
  as 
  long 
  as 
  the 
  

   9th. 
  Abdominal 
  segments 
  2-7 
  with 
  transversely 
  oval 
  raised 
  smooth 
  

   callosities, 
  those 
  on 
  the 
  6th 
  and 
  7tli 
  being 
  round 
  instead 
  of 
  oval; 
  be- 
  

   neath 
  are 
  similar 
  callosities. 
  

  

  Head 
  a 
  little 
  over 
  one-half 
  as 
  wide 
  as 
  the 
  prothoracic 
  segment; 
  an- 
  

   tennae 
  3-joiuted; 
  2d 
  joint 
  one-half 
  to 
  two-thirds 
  as 
  long 
  as 
  the 
  1st 
  and 
  

   one-half 
  as 
  thick; 
  3d 
  minute, 
  about 
  one-third 
  as 
  long 
  as 
  the 
  2d 
  joint 
  

   is 
  thick. 
  Maxilla 
  with 
  the 
  lobe 
  as 
  wide 
  as 
  the 
  basal 
  joint 
  of 
  the 
  

   palpus, 
  and 
  reaching 
  to 
  the 
  end 
  of 
  the 
  2d 
  palpal 
  joint; 
  the 
  maxillary 
  

   palpi 
  4-jointed, 
  the 
  2d 
  joint 
  one-half 
  as 
  wide 
  as 
  the 
  1st; 
  the 
  3d 
  just 
  two- 
  

   thirds 
  as 
  wide 
  as 
  the 
  2d; 
  the 
  4:th 
  as 
  long 
  but 
  one-half 
  as 
  thick 
  as 
  the 
  3d. 
  

  

  Labium 
  with 
  the 
  ligula 
  small 
  and 
  rounded, 
  not 
  more 
  than 
  one-third 
  

   wider 
  than 
  the 
  basal 
  joint 
  of 
  the 
  labial 
  i)alpus, 
  the 
  latter 
  2-jointe(l, 
  

   the 
  2d 
  joint 
  nearly 
  as 
  long 
  and 
  about 
  two-thirds 
  as 
  thick 
  as 
  the 
  1st. 
  

   Mentum 
  deeply 
  cleft, 
  one-half 
  as 
  long 
  as 
  the 
  submentum. 
  

  

  Labrum 
  small, 
  rounded, 
  not 
  so 
  long 
  as 
  round, 
  surface 
  convex, 
  with 
  

   dense 
  hairs. 
  Mandibles 
  obtuse, 
  rounded, 
  not 
  toothed. 
  

  

  Length 
  of 
  body, 
  17^™; 
  width 
  of 
  prothoracic 
  segment, 
  4.5™"^; 
  length, 
  

   2uQra. 
  width 
  of 
  7th 
  abdominal 
  segment, 
  3™™. 
  Thoracic 
  spiracles 
  in 
  the 
  

   middle 
  of 
  the 
  mesothoracic 
  segment, 
  with 
  the 
  usual 
  eight 
  pairs 
  of 
  ab- 
  

   dominal 
  ones. 
  

  

  Pupa 
  as 
  described 
  in 
  Bulletin 
  7. 
  The 
  end 
  of 
  the 
  body 
  terminates 
  

   in 
  a 
  pair 
  of 
  incurved 
  hooks 
  on 
  each 
  side, 
  the 
  inner 
  pair 
  a 
  little 
  smaller 
  

   than 
  the 
  outer. 
  Six 
  large 
  recurved 
  spines 
  on 
  the 
  i)enultimate 
  abdomi- 
  

   nal 
  segment, 
  the 
  other 
  abdominal 
  segment 
  with 
  about 
  two 
  irregular 
  

   rows 
  of 
  minute 
  stout 
  spines 
  adapted 
  for 
  progression. 
  

  

  Clytus? 
  larva 
  on 
  the 
  Black 
  Birch. 
  

  

  Plate 
  XII, 
  Fig. 
  3, 
  represents 
  the 
  mouth-parts 
  of 
  a 
  Glytus 
  nearly 
  

   allied 
  to 
  if 
  not 
  identical 
  with 
  X. 
  colonus, 
  

  

  THE 
  RIBBED 
  RHAGIUM. 
  

  

  EJiagium 
  lineatum 
  Olivier. 
  PI. 
  XI, 
  Figs. 
  1, 
  2. 
  

  

  The 
  following 
  description 
  gives 
  the 
  characters 
  more 
  fully 
  than 
  in 
  Bul- 
  

   letin 
  7, 
  p. 
  162 
  : 
  

  

  Body 
  long 
  and 
  narrow, 
  head 
  remarkably 
  large, 
  as 
  wide 
  and 
  as 
  large 
  

   as 
  the 
  prothoracic 
  segment. 
  

  

  Head 
  behind 
  with 
  a 
  triangular 
  incision 
  ; 
  the 
  apex 
  of 
  the 
  incision 
  is 
  

   met 
  by 
  a 
  curved 
  line 
  passing 
  back 
  from 
  the 
  outside 
  of 
  the 
  antennae, 
  

   dividing 
  the 
  epicranium 
  into 
  two 
  areas. 
  Olypeus 
  more 
  solid 
  than 
  usual, 
  

   Labrum 
  about 
  twice 
  as 
  wide 
  as 
  long, 
  and 
  moderately 
  rounded 
  in 
  front. 
  

  

  