786 Wisconsin Academy of Sciences, Arts, and Letters . 
26. Siebold, C. T. H. v. Uber die Edrtpflauzung der Libellen. 
Oermars Zeit. Entbm. II, 1840. 
27. Smith, J. B. Epipharynx and hypopharynx of Odonata. 
Proc. Am. Assc. Adv. Sc. 1891. 
28. Smith, J. B. An essay on the development of the month 
parts of certain insects. Trans. Am. Phil. Soc. XIX, 
1898. 
29. Voinov, D. X. Epithelium digestif des numphes 
d’Aeschna. Bull. Soc. Sc. Bucarest VII, 1898. 
REFERENCE LETTERS. 
A. Anterior. 
Ant. Antenna. 
Ap. Apodeme. 
Br. Brain. 
Br. C. Bnrsa copulatrix. 
Bm. Basement membrane. 
C. Brush. 
Cly. Clypeus. 
Cm. Circular muscles. 
Cu. Cuticula. 
Cu. Co. Cuticular collar. 
D. Dorsal. 
E. Eye. 
Ep. Epicranium. 
Epth. Epithelium. 
FI. Fore-intestine. 
Fr. Frons. 
Ft. Fat bodies. 
G. Gena. 
Gu. Gula. 
H I. Hind-intestine. 
Hp. Hypodermis. 
Hyp. Hypopharynx. 
II. Ileum. 
L. Labium. 
Lb. Labrum. 
Lm. Longitudinal muscles. 
M. Muscles. 
Md. Mandible. 
Mes. th. Mesothorax. 
Met. th. Metathorax. 
MI. Mid-intestine. 
Mx. Maxilla. 
Mxp. Maxillary palp. 
Oc. Ocellus. 
Oes. Oesophagus. 
Op. Occiput. 
Odt. Oviduct. 
Odt. Cm. Oviductus communis. 
Pg. Pigment. 
Ph. Pharynx. 
Ph. PI. Pharyngeal plate. 
Pro. th. Prothorax. 
Rp. Sem. Receptaculum seminis. 
R. sgl. Reservoir of salivary gland. 
Rt. Rectum. 
S- gl. Salivary gland. 
T. Testis. 
Tr. Trachea. 
Yc. Sem. Vescicula seminalis. 
Vd. Yas deferens. 
Vg. Vagina. 
Vt. Vertex. 
