﻿LARV^ 
  OF 
  INJURIOUS 
  FOREST 
  INSECTS. 
  25'J 
  

  

  dicated, 
  the 
  sides 
  being 
  most 
  distinct. 
  Thoracic 
  feet 
  minute, 
  3-jointed, 
  

   small 
  and 
  rather 
  short; 
  3d 
  joint 
  one-half 
  as 
  thick 
  as 
  the 
  2d. 
  

  

  Head: 
  clypeus 
  very 
  small, 
  membranous 
  ; 
  labrum 
  small, 
  narrow, 
  though 
  

   longer 
  than 
  wide, 
  and 
  well 
  rounded 
  in 
  front 
  ; 
  mandibles 
  solid, 
  thick, 
  

   rounded 
  at 
  tip; 
  antennae 
  4-jointed, 
  rather 
  slender; 
  2d 
  joint 
  about 
  one- 
  

   half 
  as 
  long 
  as 
  the 
  1st 
  and 
  about 
  one-quarter 
  shorter 
  than 
  the 
  3d 
  ; 
  the 
  

   4th 
  minute, 
  slender, 
  about 
  two-thirds 
  as 
  long 
  as 
  the 
  3d 
  is 
  wide. 
  Maxillae 
  

   with 
  the 
  lobe 
  rather 
  broad, 
  not 
  very 
  hairy, 
  extending 
  as 
  far 
  as 
  the 
  end 
  

   of 
  the 
  maxillary 
  and 
  labial 
  palpi; 
  maxillary 
  palpus 
  4-jointed; 
  1st 
  joint 
  

   much 
  shorter 
  than 
  long, 
  flattened, 
  spherical; 
  2d 
  subspherical; 
  3d 
  one- 
  

   half 
  as 
  long 
  as 
  the 
  2nd; 
  4th 
  longer 
  than 
  3d, 
  but 
  only 
  about 
  one-half 
  as 
  

   thick. 
  Mentum 
  narrow, 
  about 
  one-third 
  as 
  long 
  as 
  wide; 
  ligula 
  long 
  

   and 
  narrow; 
  labial 
  palpi 
  3-jointed; 
  1st 
  joint 
  a 
  little 
  longer 
  than 
  thick; 
  

   2d 
  very 
  short, 
  spheroidal, 
  a 
  little 
  less 
  than 
  one-third 
  as 
  long 
  as 
  1st; 
  3d 
  

   conical, 
  considerably 
  longer 
  than 
  the 
  2d 
  and 
  one-half 
  as 
  thick. 
  

  

  Length, 
  12^""^ 
  ; 
  length 
  of 
  prothoracic 
  segment, 
  2"^°^ 
  ; 
  breadth, 
  3"^"^ 
  ; 
  

   breadth 
  of 
  8th 
  abdominal 
  segment, 
  2.5™"^. 
  

  

  THE 
  OAK 
  BORER. 
  

  

  Elaphidion 
  parallelum 
  Newman. 
  PL 
  YII, 
  Fig. 
  1. 
  

  

  The 
  body 
  very 
  closely 
  resembles 
  X 
  colonuSy 
  but 
  is 
  larger 
  and 
  broader, 
  

   especially 
  on 
  segments 
  7-9, 
  but 
  in 
  general 
  appearance 
  is 
  closely 
  similar. 
  

   Prothoracic 
  segment 
  scarcely 
  wider 
  than 
  the 
  mesothoracic, 
  but 
  not 
  so 
  

   much 
  swollen 
  as 
  in 
  Xylotrechus. 
  The 
  disk 
  is 
  regularly 
  transversely 
  ob- 
  

   long, 
  the 
  sides 
  not 
  convex 
  but 
  straight, 
  the 
  edges 
  in 
  front 
  and 
  on 
  the 
  

   sides 
  brown. 
  The 
  disk 
  is 
  one-half 
  as 
  long 
  as 
  broad 
  ; 
  posterior 
  half 
  free 
  

   from 
  hairs, 
  not 
  so 
  distinctly 
  marked 
  as 
  in 
  X. 
  colonus, 
  but 
  the 
  longitudi- 
  

   nal 
  irregular 
  pale 
  streaks 
  are 
  present. 
  The 
  mesothoracic 
  and 
  metatho- 
  

   racic 
  segments 
  are 
  as 
  wide 
  as 
  the 
  prothoracic, 
  but 
  the 
  mesothoracic 
  is 
  a 
  

   little 
  shorter 
  than 
  the 
  metathoracic. 
  The 
  mesothoracic 
  segment 
  is 
  di- 
  

   vided 
  into 
  two 
  lateral 
  jjortions 
  by 
  a 
  scutel-like, 
  very 
  short 
  and 
  broad 
  

   callosity 
  which 
  is 
  narrow, 
  lanceolate-oval. 
  The 
  metathoracic 
  segment 
  

   has 
  a 
  similar 
  callosity, 
  but 
  a 
  transverse 
  fleshy 
  ridge 
  is 
  present, 
  not 
  

   found 
  on 
  the 
  mesothoracic 
  segment. 
  Beneath, 
  a 
  callous 
  brown 
  spot 
  in- 
  

   cised 
  in 
  the 
  middle, 
  longer 
  and 
  narrower 
  than 
  those 
  on 
  the 
  six 
  succeed- 
  

   ing 
  segments. 
  That 
  on 
  the 
  prothoracic 
  is 
  much 
  shorter 
  and 
  narrower 
  

   than 
  on 
  the 
  mesothoracic, 
  the 
  latter 
  not 
  divided 
  mesially, 
  where 
  those 
  

   on 
  the 
  metathoracic 
  and 
  three 
  succeeding 
  segments 
  are 
  partly 
  divided 
  

   by 
  the 
  median 
  line 
  of 
  the 
  body, 
  forming 
  two 
  irregular 
  oval 
  patches 
  

   touching 
  the 
  median 
  line 
  of 
  the 
  body, 
  and 
  with 
  the 
  outer, 
  hinder 
  edge 
  

   produced 
  a 
  little 
  posteriorly. 
  On 
  the 
  1st 
  abdominal 
  segment 
  is 
  a 
  trans- 
  

   verse, 
  short 
  but 
  very 
  wide 
  crescent-shaped 
  callosity 
  with 
  swollen 
  margins 
  ; 
  

   on 
  the 
  succeeding 
  segments 
  these 
  become 
  longer 
  and 
  narrower, 
  until 
  

   on 
  the 
  4th 
  segment 
  they 
  become 
  one-half 
  as 
  long 
  as 
  broad; 
  on 
  the 
  

   hinder 
  segments 
  (5-7) 
  they 
  become 
  still 
  longer 
  and 
  transversely 
  oblong- 
  

   17 
  E 
  

  

  