128 
Long.  5,5/  9.  Face  jaune.  Front  noir 
à  duvet  grisâtre  et  base  testacée.  Antennes 
jaunes;  troisième  article  quatre  fois  aussi 
long  que  le  deuxième  ;  style  ne  paraissant 
cilié  qu’en  dessus.  Thorax  d’un  noir  bleu¬ 
âtre,  à  léger  duvet  gris  et  poils  noirs  serrés- 
Abdomen  déprimé,  d’un  beau  bleu  métalli¬ 
que,  un  peu  violet.  Pieds  d’un  fauve  clair. 
Cuillerons  et  ailes  un  peu  brunâtres. 
Du  Brésil.  Muséum. 
In  his  important  monograph  GOUDOT 
gives  a  slightly  more  detailed  description  ; 
“Longueur  17  mm;  antennes  jaunes,  le 
premier  article  ayant  à  son  extrémité  une 
petite  houppe  de  poils  noirs  courts,  le  troi¬ 
sième  à  lui  seul  au  moins  aussi  long  que 
les  deux  autres,  le  style  un  peu  brun,  n’ay¬ 
ant  de  cils  qu’en  dessus,  yeux  bruns  avec 
une  bande  noirâtre  au  milieux  ;  front  avancé 
obtus,  brun,  à  poils  noirâtres  ;  à  face  et  ca¬ 
vité  frontale  fauves,  couvertes  de  petits 
poils  formant  duvet,  qui  font  paraître  ces 
parties  d’un  blanc  soyeux;  thorax  brun  nu¬ 
ancé  de  bleuâtre,  tacheté  de  gris  et  noir  for¬ 
mant  des  zones  longitudinales,  couvert  de 
poils  très  courts  noirs,  écusson  comme  le 
thorax  ;  abdomen  chagriné,  d’un  beau  bleu 
couvert  de  très  petits  poils  noirs,  avec  son 
premier  anneau  et  le  bord  antérieur  du  se¬ 
cond  d’un  blanc  sale,  ayant  des  poils  dt  la 
même  couleur;  pattes  fauves,  à  poils  fauves; 
ailes  brunes.  Individu  mâle. 
Habitation  ;  la  Nouvelle-Grenade”. 
The  eyes  of  living  specimens  are  brick 
red  and  show  no  pattern.  The  ground  color 
varies  a  little  on  face  and  legs  ;  for  the  rest 
our  specimens  agree  with  the  descriptions 
and  are  undoubtedly  of  the  same  kind. 
We  will  not  describe  the  larvae,  which 
vary  a  good  deal  rrom  one  stage  to  another. 
On  this  acount  I  suppressed  the  parts  deal¬ 
ing  with  them  (and  with  the  pupae),  in  the 
foregoing  descriptions. 
The  scutum  is  not  properly  described. 
The  pattern  on  it  varies  with  the  incidence 
of  light  (as  in  Sarcophagae),  and  in  old  spe¬ 
cimens  is  often  obliterated.  Our  illustration 
gives  a  good  idea  of  its  most  common  as¬ 
pect. 
I  have  examined  a  great  many  specL 
mens,  from  different  states,  without  finding 
any  specific  differences. 
To  the  already  long  list  of  hosts  of  Der- 
matobia  may  be  added  Grison  vitatus,  in 
which  Dr.  TRAVASSOS  found  a  larva  after¬ 
wards  examined  by  me. 
V.  Genus  Gastrophilus  LEACH. 
The  larvae  of  the  genus  Gastrophilus 
live  in  the  stomach  of  Equidae  and  are 
easily  carried  to  distant  countries.  I,  for  ins¬ 
tance,  have  found  a  species,  which  attacks 
horses  on  the  island  of  Oahu  (Hawai)  whe¬ 
re  horses  were  unknown  before  the  advent 
of  the  white  race.  Another  instance  is  the  fin¬ 
ding  of  a  flv  I  determined  here  (shown  in  fig.  9) 
which  had  hitherto  been  only  known  from  the 
North  of  Africa.  I  was  told  that  a  similar  fly  was 
found  in  Maranhão,  but  was  unable  to  ob¬ 
tain  a  specimen.  Up  to  now,  I  have  not  he¬ 
ard  of  other  observations  of  imported  Oes - 
trinae  in  Brazil,  but  a  kind  of  Rhinoestrus 
'  attacking  sheep  has  been  introduced  to  the 
River-Plate  and  may  already  have  found  its 
way  to  this  country. 
BRAUER  gives  very  full  descriptions  of 
the  genus  and  its  species.  I  will  only  reprint 
the  indications  which  are  useful  for  the  de¬ 
termination  of  the  genus  and  the  species 
G.  equi  and  asininus. 
Gastrophilus  LEACH. 
Wings  without  transversal  apical  vein, 
the  fourth  ending  at  the  posterior  margin. 
Abdomen  sessile;  antennary  arista  bare, 
squamae  small,  generally  with  long  cilia, 
not  covering  the  halteres;  mouth-parts  very 
small  ;  palpi  small,  spherical,  well  inside  the 
small  oral  depression  ;  proboscis  attached  to 
the  membrane  that  covers  the  oral  depres¬ 
sion,  not  extensible”. 
Gastrophilus  equi  FABR. 
Transversal  posterior  vein  always  pre¬ 
sent  and  placed  immediately  behind  the 
small  one.  Wings  hyaline,  with  smoke-colored 
transversal  band  in  the  middle,  and  either  an 
