Newport, Tr. Linn. Soc. xx. 1851, pl. 21, fig. 13. Loew, however, who also describes and figures the anatomy of S. lutaria, states that there is no paunch. Linnaea entomologica, iii. 1848, p. 354.
M‘Lachlan, Ent. Month. Mag. vii. 1870, p. 145.
Rep. Ins. Missouri, ix. 1877, p. 125.
Tijdschr. Ent. vol. xxxiv. 1891.
Arch. f. Naturg. iv. i. 1838, p. 315.