1929] 
Tracheal System of Pyrausta nubilalis 
357 
md. mandible. 
mf. tracheae to muscles and fat tissue, 
mfb. tracheae to muscles and fat body, 
mh. tracheae to muscles and heart. 
Mtr. main longitudinal trachea. 
Mus. muscle layer, 
mx. maxilla, 
n. nerve, 
oes. oesophagus, 
pi. proleg. 
Sp. Position of spiracle. SpP., prothoracic, Sp. 1 ab. to 
Sp. 8 ab., abdominal spiracles. Numbers indicate 
segments. 
Strm. Sterno tergal muscle, 
svrm. small ventro-recti muscle, 
ten. tentovium. 
tr. transverse trachea, 
v/bms. mesothoracic wing-bud. 
wbmt. metathoracic wing-bud. 
1-18. Tracheae of such numbers. 
