258 BENJAMIN P. YOUNG 
biidae. The list which follows gives the family, the species, the sex, and 
a reference to the drawings made of each. In addition, information 
gathered during the study as to the number of abdominal spiracles and 
their location in membrane or chitin is included. 
Order Diptera 
Division Proboscidae 
Orthorrhapha — Nemocera 
Tipulidae. Pedicia albivitta, female (Plate IX, 1 and 2), eight abdominal spiracles, all 
but last in membrane. It is possible that the supposed eighth spiracle may be the caudal 
attachment of the tracheal system to the tergite. 
Pachyrrhina ferruginea, male (Plate IX, 3), seven abdominal spiracles, all in 
membrane. 
Rhyphidae. Trichocera brumalis, female (Plate X, 4), seven abdominal spiracles, all 
in membrane. 
Dixidae. Diza modesta, female (Plate X, 5), seven abdominal spiracles, all in 
membrane. 
Psychodidae. Psychoda slossoni, female (Plate X, 6), seven abdominal spiracles, all in 
membrane. 
Chironomidae. Chironomus ferrugineavitta, male (Plate XI, 7 and 8), at least seven and 
possibly eight abdominal spiracles, all in membrane. : 
Culicidae. Culex canadensis, male (Plate XI, 9), seven abdominal spiracles, all in 
membrane. 
Anopheles quadrimaculata, female (Plate XII, 10), seven abdominal spiracles, all in 
membrane. 
Corethra albipes, female (Plate XTI, 11), seven abdominal spiracles, all in membrane. 
Mycetophilidae. Leia winthemi, female (Plate XII, 12), seven abdominal spiracles, all in 
membrane. 
Sciaridae. Sciara ochrolabis, male (Plate XIII, 13), seven abdominal spiracles, all in 
membrane. 
Cecidomyiidae. Rhabdophaga strobiloides, male (Plate XIII, 14), seven abdominal spiracles, 
all in membrane. 
Bibionidae. Plecia heteroptera, female (Plate XIII, 15), eight abdominal spiracles, all in 
membrane. 
Simuliidae. Simulium hirtipes, male (Plate XIV, 16), seven abdominal spiracles, all but 
first in membrane. | 
Blepharoceridae. Blepharocera tenuipes, female (Plate XIV, 17), seven abdominal | 
spiracles, all in membrane. | 
Orphnephilidae. Orphnephila americana, female (Plate XIV, 18), seven abdominal spiracles, 
all in membrane. Semblance of eighth spiracle indicated by color but no spiracular 
opening to be seen. 
Orthorrhapha — Brachycera | 
Stratiomyiidae. Allognosta fuscitarsis, female (Plate XV, 19), seven abdominal 
spiracles, all in membrane. 
