ATTACHMENT OF THE ABDOMEN TO THE THORAX IN DrpTERA 259 
Tabanidae. Chrysops indus, male (Plate XV, 20), seven abdominal spiracles, all in 
membrane. ; 
Leptidae. Chrysopiia ornata, male (Plate XY, 21), seven abdominal spiracles, all in 
membrane. 
Nemistrinidae. Hirmoneura sp., female (Plate XVI, 22), seven abdominal spiracles, all 
in membrane. 
Cyrtidae. Oncodes incultus, female (Plate XVI, 23), six abdominal spiracles, all in 
chitin. 
Bombylidae. Anthrax alternata, female (Plate XVI, 24), seven abdominal spiracles, all 
in membrane. 
Therevidae. Thereva fucata, male (Plate XVII, 25), seven abdominal spiracles, all in 
membrane. 
Scenopinidae. Scenopinus fenestralis, female (Plate XVII, 26), at least seven and possibly 
eight abdominal spiracles, probably all in membrane, although those of last four seg- 
ments (considering eight spiracles) are very close to the chitinous margin of the 
sternites. 
Midaidae. Midas clavatus, female (Plate XVII, 27), eight abdominal spiracles, all in 
membrane except last which is surrounded by chitin. 
Asilidae. Leptogaster loewi, female (Plate XVIII, 28), at least seven and possibly an 
eighth abdominal spiracle, all except eighth in membrane. 
Dolichopodidae. Dolichopus cuprinus, male (Plate XVIII, 29), seven abdominal spiracles, 
all in membrane. 
Empididae. Rhamphomyia sp., female (Plate XVIII, 30), seven abdominal spiracles, all 
in membrane. 
Lonchopteridae. Lonchoptera sp., female (Plate XIX, 31), seven abdominal spiracles, 
last four in membrane. 
Phoridae. Phora concinna, female (Plate XIX, 32), at least six and possibly seven 
abdominal spiracles, all in membrane. 
yclorrhapha — Athericera 
Platypezidae. Platypeza velutina, female (Plate XIX, 33), seven abdominal spiracles, first, 
fifth, sixth, and seventh in membrane. 
Pipunculidae. Pipunculus atlanticus, female (Plate XX, 34), seven abdominal spiracles, 
all in membrane. 
Syrphidae. Syrphus americanus, male (Plate XX, 35), seven abdominal spiracles, all in 
membrane. 
Conopidae. Myopa vesiculosa, male (Plate XX, 36), seven abdominal spiracles, all but 
sixth and seventh in membrane. 
ryclorrhapha — Calyptratae 
Oestridae. Gastrophilus intestinalis, female (Plate XXI, 37), seven abdominal spiracles, 
all in membrane. 
Tachinidae. Tachina mella, female (Plate XXI, 38), seven abdominal spiracles, sixth 
only in membrane although first is in very light chitin. 
Dexiidae. Thelaira nigripes, male (Plate XXI, 39), seven abdominal spiracles, probably 
all in chitin although first, sixth, and seventh are in very light chitin. 
