﻿NEOTROPICAL 
  MALLOPHAGA 
  — 
  CARRIKER 
  537 
  

  

  shape 
  and 
  chaetotaxy 
  of 
  the 
  prosternal 
  plate 
  as 
  given 
  by 
  Ewing. 
  It 
  

   measures 
  2.36 
  by 
  .90. 
  

  

  This 
  species 
  is 
  close 
  to 
  bruneri 
  (Carriker), 
  having 
  the 
  same 
  style 
  

   of 
  head 
  bands 
  and 
  exactly 
  the 
  same 
  gular 
  plate 
  and 
  chaetotaxy. 
  It 
  

   differs, 
  however, 
  in 
  the 
  shape 
  ot 
  the 
  head, 
  australis 
  having 
  the 
  temples 
  

   convex, 
  while 
  in 
  bruneri 
  they 
  are 
  concave. 
  In 
  australis 
  the 
  sides 
  of 
  

   the 
  mesothorax 
  and 
  metathorax 
  are 
  straight, 
  while 
  in 
  bruneri 
  the 
  sides 
  

   of 
  the 
  mesothorax 
  are 
  convex 
  and 
  the 
  sides 
  of 
  the 
  metathorax 
  are 
  

   concave. 
  D. 
  australis 
  is 
  also 
  much 
  larger 
  than 
  bruneri, 
  the 
  male 
  of 
  

   the 
  latter 
  measuring 
  only 
  2.13 
  by 
  .80. 
  The 
  dorsal 
  aspect 
  of 
  the 
  

   paratergals 
  is 
  different, 
  as 
  well 
  as 
  the 
  shape 
  and 
  chaetotaxy 
  of 
  the 
  

   prosternal 
  plate, 
  that 
  of 
  bruneri 
  being 
  shorter, 
  and 
  broader 
  anteriorly, 
  

   and 
  with 
  the 
  eight 
  longish 
  hairs 
  aU 
  set 
  inside 
  the 
  clear 
  area, 
  while 
  in 
  

   australis 
  there 
  are 
  four 
  setae 
  in 
  the 
  clear 
  area 
  and 
  two 
  in 
  the 
  lateral 
  

   band 
  (male). 
  Ewing 
  shows 
  three 
  setae 
  in 
  the 
  lateral 
  band 
  and 
  three 
  

   m. 
  the 
  clear 
  area 
  (female), 
  but 
  in 
  my 
  female 
  the 
  setae 
  are 
  arranged 
  in 
  

   the 
  same 
  manner 
  as 
  in 
  the 
  male. 
  

  

  Measurements 
  of 
  adult 
  male 
  and 
  female 
  in 
  collection 
  of 
  author: 
  

  

  Male 
  Female 
  

  

  Length 
  Width 
  Length 
  Width 
  

  

  Body 
  2.39 
  2.88 
  

  

  Head 
  

  

  ant. 
  fossae 
  .49 
  .51 
  

  

  temples 
  .49 
  .65 
  .542 
  .76 
  

  

  occiput 
  .434 
  .51 
  

  

  Prothorax 
  .288 
  .40 
  .314 
  .465 
  

  

  Meso-metathorax 
  .358 
  .655 
  .37 
  .803 
  

  

  Abdomen 
  1.44 
  .90 
  1.86 
  1.19 
  

  

  Basal 
  plate 
  .41 
  .13 
  

  

  Parameres 
  .24 
  .14 
  

  

  Endomeral 
  sac 
  .217 
  .14 
  

  

  Dennyus 
  dubius 
  (Kellogg) 
  

  

  Nitzschia 
  dubius 
  Kellogg, 
  Proc. 
  California 
  Acad. 
  Sci., 
  ser. 
  2, 
  vol. 
  6, 
  p. 
  540, 
  1896. 
  

   (Host, 
  Chaetura 
  pelagica 
  (Linnaeus) 
  .) 
  

  

  I 
  have 
  no 
  specimens 
  of 
  this 
  species 
  and 
  have 
  used, 
  with 
  some 
  

   misgivings, 
  Ewing's 
  description 
  and 
  figures 
  as 
  a 
  basis 
  for 
  my 
  con- 
  

   clusions 
  regarding 
  it. 
  Ewing 
  says 
  his 
  description 
  is 
  based 
  "upon 
  

   many 
  adult 
  specimens 
  chiefly 
  from 
  the 
  type 
  host" 
  (italics 
  mine), 
  and 
  

   lists 
  under 
  dubius 
  specimens 
  not 
  only 
  from 
  Aeronautes 
  melanoleucus 
  

   (A. 
  s. 
  saxatilis), 
  type 
  host 
  for 
  D. 
  bruneri 
  (Carriker), 
  but 
  from 
  Chaetura 
  

   richmondi, 
  from 
  Eden, 
  Nicaragua; 
  yet, 
  in 
  the 
  same 
  paper, 
  he 
  describes 
  

   Dennyus 
  richmondi 
  whose 
  host 
  is 
  Chaetura 
  richmondi, 
  also 
  from 
  Eden, 
  

   Nicaragua. 
  

  

  