﻿166 
  F. 
  W. 
  EDWARDS. 
  

  

  Genus 
  Lasiohelea, 
  Kieff. 
  

  

  Lasiohelea, 
  Kieffer, 
  Arch. 
  Inst. 
  Pasteur 
  Afr. 
  Nord, 
  Algiers, 
  i, 
  no. 
  1, 
  p. 
  115 
  (1921). 
  

   Centrorhynchus, 
  Lutz, 
  Mem. 
  Inst. 
  Oswaldo 
  Cruz, 
  v, 
  p. 
  62 
  (1913) 
  ; 
  preoccupied 
  

   by 
  Centrorhynchus, 
  Luhe, 
  1911 
  (Vermes). 
  

  

  The 
  genus 
  Centrorhynchus 
  was 
  proposed 
  by 
  Lutz 
  for 
  two 
  Brazilian 
  species, 
  

   C. 
  stylifer 
  and 
  C. 
  setifer, 
  the 
  former 
  being 
  regarded 
  as 
  the 
  genotype. 
  Lutz's 
  diagnosis 
  

   is 
  not 
  very 
  detailed, 
  and 
  it 
  would 
  seem 
  that 
  he 
  meant 
  the 
  genus 
  to 
  include 
  any 
  biting 
  

   Ceratopogoninae 
  with 
  completely 
  unspotted 
  wings. 
  In 
  a 
  subsequent 
  publication, 
  

   Lutz 
  identifies 
  the 
  previously 
  described 
  Cotocripus 
  caridei, 
  Brethes, 
  with 
  his 
  

   Centrorhynchus 
  setifer, 
  and 
  proposes 
  to 
  adopt 
  Brethes' 
  name 
  Cotocripus 
  for 
  his 
  genus. 
  

  

  The 
  British 
  Museum 
  is 
  indebted 
  to 
  Prof. 
  R. 
  Newstead 
  and 
  Mr. 
  H. 
  F. 
  Carter 
  for 
  

   specimens 
  of 
  both 
  Centrorhynchus 
  stylifer 
  and 
  C. 
  setifer, 
  named 
  by 
  Dr. 
  Lutz 
  ; 
  the 
  

   specimen 
  of 
  the 
  former 
  was 
  taken 
  from 
  horses' 
  ears 
  at 
  Villa 
  Nova, 
  Bahia, 
  Brazil. 
  

   In 
  the 
  writer's 
  opinion, 
  the 
  two 
  species 
  are 
  not 
  congeneric, 
  C. 
  setifer 
  (and 
  therefore 
  

   presumably 
  Cotocripus 
  caridei) 
  being 
  only 
  a 
  slightly 
  modified 
  Culicoides, 
  without 
  any 
  

   empodium, 
  while 
  C. 
  stylifer 
  is 
  quite 
  different, 
  belonging 
  to 
  the 
  Forcipomyia 
  group, 
  

   with 
  a 
  well-developed 
  empodium, 
  and 
  closely 
  resembling 
  in 
  its 
  venation 
  and 
  most 
  

   other 
  characters 
  the 
  European 
  Ceratopogon 
  velox, 
  Winn. 
  This 
  resemblance 
  between 
  

   C. 
  stylifer 
  and 
  C. 
  velox 
  clearly 
  indicates 
  that 
  these 
  two 
  are 
  congeneric, 
  but 
  since 
  Lutz's 
  

   name 
  is 
  preoccupied, 
  and 
  Cotocripus 
  is 
  shown 
  not 
  to 
  be 
  applicable, 
  another 
  name 
  must 
  

   be 
  searched 
  for. 
  

  

  Kieffer 
  has 
  recently 
  (Ann. 
  Mus. 
  Nat. 
  Hung., 
  xvii, 
  p. 
  23, 
  1919) 
  described 
  a 
  so-called 
  

   new 
  species 
  as 
  Atrichopogon 
  pilosipennis, 
  and 
  still 
  more 
  recently, 
  in 
  the 
  paper 
  

   quoted 
  above, 
  has 
  introduced 
  for 
  this 
  species 
  the 
  generic 
  name 
  Lasiohelea. 
  Now 
  

   A. 
  pilosipennis 
  is 
  so 
  similar 
  to 
  Winnertz's 
  C. 
  velox 
  that 
  it 
  seems 
  quite 
  probable 
  

   that 
  the 
  two 
  are 
  identical. 
  Kieff 
  er's 
  name 
  Lasiohelea 
  may 
  therefore 
  be 
  used 
  to 
  

   replace 
  Lutz's 
  Centrorhynchus. 
  

  

  The 
  structural 
  characters 
  of 
  Lasiohelea, 
  as 
  pointed 
  out 
  by 
  Kieffer, 
  are 
  intermediate 
  

   between 
  Atrichopogon 
  and 
  Forcipomyia. 
  It 
  resembles 
  the 
  former 
  genus 
  in 
  the 
  

   structure 
  of 
  the 
  antennae 
  and 
  in 
  the 
  venation, 
  notably 
  in 
  the 
  very 
  long 
  second 
  radial 
  

   cell, 
  which 
  extends 
  well 
  beyond 
  the 
  middle 
  of 
  the 
  wing 
  ; 
  this 
  cell, 
  however, 
  is 
  narrower 
  

   than 
  it 
  is 
  in 
  Atrichopogon, 
  the 
  radius 
  being 
  almost 
  in 
  contact 
  with 
  the 
  costa, 
  while 
  

   the 
  first 
  radial 
  cell 
  is 
  obliterated 
  by 
  the 
  fusion 
  of 
  R 
  x 
  and 
  Rs. 
  

  

  On 
  the 
  other 
  hand, 
  the 
  relationship 
  to 
  Forcipomyia 
  is 
  shown 
  by 
  the 
  rather 
  densely 
  

   hairy 
  wings, 
  though 
  the 
  hairs 
  are 
  less 
  close-lying 
  than 
  in 
  Forcipomyia, 
  and 
  there 
  are 
  

   bare 
  lines 
  adjoining 
  the 
  veins, 
  as 
  in 
  Atrichopogon. 
  Among 
  the 
  larger 
  hairs, 
  which 
  

   are 
  spread 
  over 
  nearly 
  the 
  whole 
  surface, 
  can 
  be 
  distinguished 
  small 
  microtrichia, 
  

   smaller 
  than 
  those 
  of 
  Atrichopogon, 
  but 
  more 
  obvious 
  than 
  those 
  of 
  Forcipomyia. 
  

  

  Besides 
  L. 
  stylifer 
  (Lutz), 
  of 
  South 
  America, 
  and 
  L. 
  velox 
  (Winn.) 
  {pilosipennis, 
  

   Kieffer), 
  of 
  Europe, 
  two 
  other 
  described 
  species 
  may 
  be 
  referred 
  to 
  this 
  genus. 
  These 
  

   are 
  Forcipomyia 
  lefanui, 
  Carter, 
  described 
  from 
  the 
  Gold 
  Coast, 
  and 
  Ceratopogon 
  

   stimulans, 
  de 
  Meijere, 
  described 
  from 
  Sumatra. 
  These 
  species 
  are 
  practically 
  identical 
  

   in 
  structure 
  with 
  L. 
  stylifer, 
  and, 
  like 
  Lutz's 
  species, 
  are 
  known 
  to 
  have 
  blood-sucking 
  

   habits. 
  Of 
  L. 
  lefanui, 
  the 
  British 
  Museum 
  possesses 
  a 
  paratype 
  obtained 
  (biting) 
  

   by 
  Dr. 
  Le 
  Fanu 
  on 
  the 
  Gold 
  Coast, 
  and 
  also 
  a 
  long 
  series 
  collected 
  by 
  Dr. 
  W. 
  A. 
  

   Lamborn 
  at 
  Ibadan, 
  S. 
  Nigeria. 
  Of 
  L. 
  stimulans, 
  the 
  Museum 
  has 
  a 
  specimen 
  from 
  

   Deli, 
  Sumatra, 
  received 
  from 
  Dr. 
  A. 
  T. 
  Stanton 
  ; 
  several 
  from 
  Peradeniya, 
  Ceylon, 
  

   collected 
  (biting) 
  by 
  Messrs. 
  E. 
  E. 
  Green 
  and 
  A. 
  Rutherford 
  ; 
  and 
  a 
  series 
  of 
  females, 
  

   without 
  doubt 
  specifically 
  identical 
  with 
  those 
  from 
  Ceylon, 
  from 
  various 
  localities 
  

   in 
  Queensland, 
  some 
  collected 
  biting 
  or 
  labelled 
  " 
  troublesome 
  sand-fly," 
  from 
  

   Dr. 
  T. 
  L. 
  Bancroft. 
  

  

  The 
  genus 
  Lasiohelea, 
  then, 
  is 
  the 
  third 
  member 
  of 
  the 
  Ceratopogoninae, 
  whose 
  

   species 
  are 
  mostly 
  or 
  all 
  habitual 
  blood-suckers, 
  the 
  one 
  possible 
  exception 
  being 
  

  

  