372 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 37 



Ilvlia Plates 8, lo, 12. Band from the mesothoracic furca to the 

 anterolateral margin of the anterior f ureal arm of the 

 metathorax. 



Ilvlib Plates 10, 12. Narrow band from the mesothoracic furca to 

 the anteromedial margin of the anterior f ureal arm of the 

 metathorax. 



IIps Plates 7, 8, 12, 14, 15. A pleural, intersegmental muscle. A 



short, subconical bundle converging from a boat-shaped 

 tendon plate which articulates freely by a short, stemlike 

 tendon attached to the mesothoracic postalar bridge, to the 

 anterior surface of the pleural wing process. 



His Plates 8, 12. An intersegmental muscle consisting of two 



distinct bundles which arise on the mesothoracic furca and 

 converge to join the tendon of pV2, inserting with the latter 

 on the basalare. (See Niiesch, 1957, footnote i, p. 624.) 



idli Plates 6, 10, 12. The external median longitudinal dorsal 



muscle of the first abdominal segment. 



idl2 Plate 6. A narrow band from the base of the hood just 



lateral to idU to the posterior end of the tergopleural suture. 



idls Plates 6, 7, 10, 12. A gently diverging bundle arising near 



the base of the hood on the dorsal surface of pocket II and 

 passing by a slim tendon beneath the tergopleural suture to 

 the antecosta of the second abdominal segment near its mid- 

 point. Homology to Illdh is not suggested. 



idvab Plate 6. Two divergent bands from the lateral margins of 

 the first abdominal furca to insertions respectively on and 

 just posterior to the caudal lip of the tergopleural suture. 



Table i provides a ready means of comparing the metathoracic 

 (and intersegmental) muscles of Crymodes devastator with those of 

 certain other Lepidoptera as described by various writers. Here the 

 muscles are arranged according to the scheme employed by Snodgrass 

 (1935). Homologies of several are doubtful, particularly those of 

 the axillaries. Muscles such as the tergopleurals, which were found 

 in Crymodes, are not listed for the other species even though they 

 may occur in some. The syntomid Amata lucerna was chosen for 

 reference from among the various Lepidoptera figured by Maki be- 

 cause it is the only one of his species which has a thoracic tympanum. 



DISCUSSION 



In a comparison of the metathoracic muscles of Crymodes with 

 those of Telca, the similarities are more impressive than the differ- 



