[331]

Festschrift Ges. naturf. Freunde Berlin, 1873.

[332]

Reference may be made to Calvert's recent paper introductory to the study of Odonata, in Tr. Amer. ent. Soc. xx. 1893, pp. 159-161.

[333]

Horae Soc. ent. Ross. xvi. 1881, p. 3.

[334]

Physiol. facett. Aug. 1891, p. 115.

[335]

Bull. Ac. Belgique (3), xvi. 1888, No. 11, p. 31.