376 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I37 



CTO, external orifice of countertym- 



panic cavity. 

 CTS, countertympanic septum. 

 Cx, coxa. 

 ex, coxal muscle. 



dl, dorsolongitudinal muscle. 



DLT, deep lateral thoraco-abdominal 



tracheal trunk. 

 dv, dorsoventral muscle. 



Ep, epaulette (nodular sclerite). 

 Epm, epimeron. 

 Eps, episternum. 



G, ganglion. 

 Gt, gut. 



H, hood. 



IM, intersegmental membrane. 

 is, intersegmental muscle, 



L, ligament. 



LG, labial (salivary) gland. 



M, meron. 



MAS, median air sac. 



Mc, merocosta. 



MRP, median ridge of furca. 



Msph, mesophragma. 



N , nerve. 



nM, median nerve. 



P, pleural muscle. 



PI, pocket I (epimeral). 



PlI, pocket II (postnotal). 



PHI, pocket III (postnotal). 



P/F, pocket IV (epimeral). 



PcB, postcoxal bridge. 



pd, pleurodorsal muscle. 



PF, posterior arm of furca. 



PIR, pleural ridge. 



PNP, posterior notal process. 



PO, pulsatile organ. 



Pp, prepectus. 



Psc, prescutum. 



PTG, pterothoracic ganglion. 



PTP, posterior tendon plate. 



pv, pleuroventral muscle. 



PWP, pleural wing process. 



S, scoloparium, containing the two tym- 

 panic sensilla. 



Sa, subalare. 



Sc, scutum. 



Scl, scutellum. 



ScP, scutal phragma. 



SLT, superficial lateral thoraco- 

 abdominal tracheal trunk. 



so, spiracular occlusor muscle. 



Sp, metathoracic spiracle. 



Spi, 1st abdominal spiracle. 



St, sternum. 



st, sternopedal muscle. 



TAS, tympanic air sac. 



TgA, tergal arm. 



TM, tympanic membrane. 



TN , tympanic twig of nerve IIINib. 



TPG, tergopleural groove. 



Tro, trochanter. 



vl, ventrolongitudinal muscle. 



VMP, ventral median plate of sternum. 



REFERENCES 

 Berlese, a. 



1909. Gli insetti. Vol. i. Milan. 

 Brace, J. C. 



18 19. Description of the Phalaena devastator, the insect that produces the 

 cut-worm. Amer. Journ. Sci., vol. i, p. 154. 

 Brocher, F. 



191 9. Les organes pulsatiles meso- et metatergaux des Lepidopteres. Arch. 

 Zool. Exp. Gen., vol. 58, pp. 149-171. 

 Eggers, F. 



191 9. Das thoracale bitympanale Organ einer Gruppe der Lepidoptera 

 Heterocera. Zool. Jahrb., Abt. Anat., vol. 41, pp. 273-376. 



