102 PRELIMINARY NOTES ON THE ODONATA. 
Genus Erythemis Hagen. 
E. simplicicollis Say. This cosmopolite is recorded at Mankato, 
Lake Madison, Lake Phalen (St. Paul) and Stillwater. It is common, 
though not very abundant, wherever found, from June to September. 
During July and August many of the individuals taken are old enough 
to be wholly pruinose, obscuring their original bright green coloration. 
One usually meets with it along the shores of lakes and ponds where 
it perches upon weed stems or flattens itself against a path, a dock or 
an old boat. Its voracious appetite keeps it continually active. 
Genus Pachydiplax Brauer. 
P. longipennis Burm. Taken at Mankato, June 13, 1913, and at 
Alden two males and three females, June 10-30, 1914. In habit and 
actions P. longipennis is very much like Leucorhinia intacta, with 
which it quite constantly associates. It is recorded from many localities 
in Iowa and Wisconsin. 
Bibliography. 
Banks, NATHAN. 
Synopsis, Catalogue and Bibliography of the Neuropteroid Insects of North 
America. Trans. Am. Ent. Soc., 1892. 
CALVERT, PHILIP P. 
Relaioeue a Odonata of Philadelphia and Vicinity. Trans. Am. Ent. 
oc., 1893. 
List of the Odonata of New Jersey. New Jersey State Board of Agri, 
1900-1909. 
Habits of the Plant-dwelling Larva of Mecistogaster modestus. Ent. News, 
Vol. XXII, page 402. 
Various papers on Nehalennia, Libellula and other genera in Entomological 
News and other periodicals, 1900-1914. 
Burmeister’s Types of Odonata. Trans. Am. Ent. Soc., 1898. 
The Fossil Odonate Phenacolestes, etc. Proc. Acad. Nat. Sc. of Phila., 
1913. 
Progress in Our Knowledge of the Odonata from 1895 to 1912. Trans. 
of Second Ent. Congress, 1912. 
DoANE, RENNIE W. 
Insects and Disease. Henry Holt & Co., 1910. 
HaAGEN, HERMANN. 
A Synopsis of the Neuroptera of North America. Smithsonian Misc. Coll., 
1861 
Monograph of the earlier stages of the Odonata. Trans. Am. Ent. Soc., 
1885. : 
GarMAN, H. 
A Preliminary Study of Kentucky Localities in which Pellagra is Prev- 
alent. Kentucky State Univ., Bull. 159. 
Keiiicort, Davin S. 
Odonata of Ohio. Ohio State Acad. Sc., 1899. 
Kirpy, W. F. 
A Synonymic Catalog of the Neuroptera-Odonata. London, 1890. 
