38 Annals Entomological Society of America [Vol, XIII, 



DORSOVENTRAL MUSCLES. 



Tergo-stemal. 



77. The Second Dorsoventral (Fig. 32). From the lateral 

 edge of the tergite near the posterior end, into the lateral angle 

 of the parasternal plate. [31]. 



PLEURAL MUSCLES. 



Stemo-pleural. 



78. The Dilator of the Spiracle (Fig. 32). From the lateral 

 end of the anterior edge of the parasternal plate into the closing 

 lever or process of the stigmatal bow. [32, Lateral stigmatal 

 muscle a]. 



79. The Second Dilator of the Spiracle (Fig. 32) originates 

 with 78 from the parasternal plate and is inserted into the 

 pleural membrane just behind the spiracle. Present only in 

 the first and second abdominal segments. [32, Lateral stigmatal 

 muscle fi). 



B. The Second Abdominal Segment. 



TRANSVERSE MUSCLES. 



Sternal. 



80. The Ve?itral Transverse Muscle (Fig. 32). From the 

 middle of the parasternal plate of one side across the anterior 

 end of the second sternite into the parasternal plate of the other 

 side. [17]. 



LONGITUDINAL MUSCLES. 



(a) Sternal. 



81. The First Ventral Muscle (Fig. 32). From behind the 

 anterior margin of the second sternite into the anterior margin 

 of the third sternite. [13]. 



82. The Second Ventral Muscle (Fig. 32). From the mesal 

 edge of the parasternal plate, into the anterior edge of the third 

 sternite. [14]. 



(b) Tergal. 



83. The First Dorsal Muscles (Fig. 32). Homologous with 

 75 and similarly arranged. 



84. The Second Dorsal Muscles (Fig. 32). Homologous 

 with 76, but originate near the transverse medial line and not 

 in the anterior margin of the second tergite. 



