ATTACHMENT OF THE ABDOMEN TO THE THORAX IN DipTERA 261 
Sapromyzidae. Sapromyza lupulina, male (Plate XXVI, 59), seven abdominal spiracles, 
all in membrane. 
Ortalidae. Rivellia viridulans, female (Plate XXVII, 60), seven abdominal spiracles, all 
but last in membrane. 
Rhopalomeridae. Rhopalomera flaviceps, female (Plate XX VII, 61), seven abdominal spir- 
acles, all in membrane. 
Trypetidae. Huaresta festiva, female (Plate X XVII, 62), seven abdominal spiracles, all 
but last in membrane. 
Micropezidae. Calobata albiceps, female (Plate XXVIII, 63), seven abdominal spiracles, 
all but last in membrane. 
Sepsidae. Sepsis violacea, female (Plate XXVIII, 64), seven abdominal spiracles, all but 
last two in membrane. 
Piophilidae. Piophila casei, female (Plate XXVIII, 65), seven abdominal spiracles, all in 
membrane. 
Psilidae. Loxocera pleuritica, male (Plate X XIX, 66), seven abdominal spiracles, all in 
membrane. 
Diopsidae. Sphyracephala brevicornis, female (Plate X XIX, 67), seven abdominal spir- 
acles, all in membrane. . 
Ephydridae. Parydra limpidipennis, female (Plate X XIX, 68), six abdominal spiracles, 
first only in membrane. 
Oscinidae. Chlorops sp., male (Plate XXX, 69), six abdominal spiracles, first, second, 
and sixth only in membrane. 
Drosophilidae. Drosophila melanogaster (?), female (Plate XXX, 70), seven abdominal 
spiracles, all in membrane. 
Geomyzidae. Anthomyza gracilis, female (Plate XXX, 71), six abdominal spiracles 
found, allin membrane. Specimen so small that it was hard to be sure of no seventh 
spiracle. 
Agromyzidae. Agromyza lateralis, male (Plate XX XI, 72), seven abdominal spiracles, 
all but last two in membrane. In female of species all but last one of seven spiracles 
are in membrane. 
Division E'proboscidae 
Hippoboscidae. Melophagus ovinus, female (Plate XXXI, 73), seven abdominal 
spiracles, all in membrane. 
Olfersia americana, female (Plates XXXI, 74, and XXXII, 75), seven abdominal 
spiracles, all in membrane. 
Order Mecoptera 
Panorpidae. Panorpa venosa, female (Plate XXXII, 76), eight abdominal spiracles, 
all in membrane. 
TERMINOLOGY 
The rule of priority in the selection of anatomical terms is recognized 
in this paper only to the extent that these are descriptive of the parts 
to which they refer, or else have been so generally accepted by workers 
