NOCTUID METATHORAX — TREAT 369 



of the prescutum to the median ridge or keel of the metapost- 

 notuni beneath the countertympanic septum, 



dU Plates 5, 8, 9, 12, 13, 14, 16. Eggers's middle muscle (niM). 



A thick band from the central portion of the scutum to the 

 posterolateral surface of the anterior tendon plate (Eggers's 

 Muskelleiste) of the tympanic frame (Niiesch's "lateral ten- 

 don plate of the postnotum"). Its fibers lie medial to the 

 tympanic twig of nerve IIIN ih, from which nerve it also 

 receives a twig. 



dla Plates 10, 12, 16. A thin, pulsatile membrane stretched 



more or less obliquely across the interior of the metascutel- 

 lum in each of its lateral arms, bordering ventrally upon 

 the haemolymph channel communicating with the axillary 

 cord of the hind wing. Probably not homologous with Ildh, 

 but corresponds to Brocher's (1919) membrane p. 



Ventrolongitudinal muscles 



vli Plate 10. A long, subcylindrical band from the caudal sur- 



face of the anterior f ureal arm to the fused sterna of ab- 

 dominal segments i and 2. 



VI2 Plates 6, 9, 10, 12. A short bundle from the dorsal surface 



of the posterior tendon plate of the tympanic frame ( ?post- 

 coxal bridge) to the ventral surface of the first (-|- second) 

 abdominal furca near its tip. May be homologous with the 

 Biigelmuskel of von Kennel and Eggers (1933, p. 26) in 

 the geometrids. 



Dorsoventral muscles 



dvi Plates 10, 12. A narrow band from the anterolateral angle 



of the scutum, medial to the anterior wing process, to the 

 basisternum just lateral to the ventral median plate. Por- 

 tions of both left and right muscles are shown in the figures 

 and are labeled L and R respectively. 



dv2 Plates 8, 12. A long band from the scutum, just posterior 



to the origin of dv^,, to the anteromedial angle of the coxa, 

 parallel to dv^. 



dvs Plates 7, 8, 12, 13, 16. Two thick bundles converging from 



the scutum anterior to dv^(^) to the median (depressor) ten- 

 don of the trochanter. According to Niiesch, this muscle in 

 Telea is also divided at its dorsal origin. 



dv4(5) Plates 6, 7, 8, 9, 12, 13, 14. A stout bundle, not obviously 



